Balanced and Unbalanced Forces Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Forces are required to move, turn, shift, release, shut, drive, drag, and so on. When you throw a ball, you are exerting energy on it to propel it through the air. A push or pull is referred to as a force. Forces can cause objects to move, and they can also slow, stop, or change the direction in which they move. e.g. the force of gravity that draws all things toward the Earth's centre.A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of Newtons (N) and represented by the symbol 'F'. Mathematically, the force can be defined as:F = m × aHere, 'F' is the force acting, m ' is the mass, and 'a ' is the acceleration of a body.Types of ForceOn the basis of action of the force applied on a body, the force is classified into two as:Balanced Force: When an equal amount of force is applied to the body but in opposite direction then this type of force is termed as Balanced Force. When balanced force is applied to a body then the body doesn't motion instead, distortion of the body can happen.Unbalanced Force: When an unequal amount of force is applied to the body, in the same or opposite direction then this type of force is termed as Unbalanced Force. When unbalanced force is applied to a body then the body does motion and in the direction of applied greater force.Balanced ForceA Balanced Force is a force that occurs when two equivalent forces work in opposite directions on a body. A body in balanced Force maintains its position, i.e., it must continue to move at the same rate and in the same direction, or it may remain stationary.If there are no forces acting on an object or balanced forces acting on it, this may happen:A stationary object stays at rest.A moving object continues to move at the same speed and in the same direction.⇒Keep in mind that an object will move even though no forces are acting on it.⇒When the sum of all the forces acting on a body equals zero, the forces are referred to as balanced forces.On the basis of the direction of the force applied on the body, the balanced forces are categorized into two as:1. Internal balanced force: The type of balanced force in which the force acts in such a way that it pushes the object inwards is called the internal balanced force.Internal balanced forcez2. External balanced force: The type of balanced force in which the force acts in such a way that it pushes the object outwards is called the external balanced force. Examples of Balanced force:In arm wrestling, where there is no winner, each individual exerts similar force but pushes in opposite directions. The net force (resultant force) is 0.WrestlingA car parked on a flat road experiences gravity pulling it downward, while the ground exerts an equal upward normal force. These balanced forces keep the car stationary.A car parked on a flat roadUnbalanced ForceUnbalanced force is a force that occurs when two forces acting in opposite directions on a body are not equal in magnitude and size. A body changes its position in an unbalanced force, i.e., we can see a moving object change its direction, either increasing or reducing its speed, and a body at rest begins to move, and vice versa.When the forces on a body are unbalanced, this may happen:A stationary object starts to move in the direction of the resultant force.A moving object changes speed and direction in the direction of the resultant force.⇒When the sum of all the forces acting on a body is not zero, the forces are referred to as unbalanced forces.In the example below, the resultant force is the difference between the two forces:Examples of Unbalanced force: If a person applies a force to a box that is greater than the frictional force between the box and the ground, the box will move, indicating unbalanced forces are at work. A person applies a force to a boxWhen a person pull a tree by rope in the same direction at the same time, the object's applied force is the result of his combined forces.A person pull a tree by ropeDifferences Between Balanced and Unbalanced ForcesBalanced ForcesUnbalanced ForcesForces that cancel each other out, resulting in no movementForces that do not cancel each other out, causing a change in motion.Resultant Force is zero (no net force).Non-zero resultant force (there is a net force).No motion or constant velocity (object remains stationary or moves at a constant speed).Causes the object to accelerate or change direction.Solved ExamplesExample 1: If a force of 20 N is applied to the body on the right side while a force of 20N is applied to the body on the left side and initially body is at rest. What is the behavior of the motion of the body?Solution:Since, the net force on the body is 0N, so there is no change in the state of motion of the body, so the body is at rest! Example 2: If a force of 50N is applied to the body on the right side while a force of 20N is applied to the body on the left side and initially body is at rest. What is the behavior of the motion of the body?Solution: As the net force on the body is 30N on the right side, so there change in the state of motion of the body on the right side, so the body starts moving towards the right! Example 3: If a force of 50N is applied to the body on the right side while a force of 120N is applied to the body on the left side and initially body is at rest. Calculate the net force on the body and the direction of the net force.Solution: Net Force = Force on left side - Force on right side = 120N - 50N = 70N Direction Of Force --> Left (As Larger Amount Of Force Is Applied On The Left Side Of The Body)Example 4: If the forces acting upon an object are balanced, then what happened to the object.Solution:If the forces acting on an object are balanced, the object will not accelerate. It could either be at rest and remain at rest, or it could be in motion at a constant velocity. In both cases, the object is not accelerating. Example 5: What will be the net force acting on the box shown below:Solution:As equal forces are applied in the opposite direction so the net force is 0.ConclusionBalanced forces are two forces of equal strength that act in opposite directions, resulting in no change in motion. These forces cancel each other out, keeping the object stationary or moving at a constant velocity. In contrast, unbalanced forces are forces that differ in either strength or direction, causing a change in the object's motion, such as acceleration or a change in direction. Unbalanced forces lead to the object speeding up, slowing down, or changing its pathRelated Reads,Contact and Non-Contact ForceTension forceNewton's laws of motionFrictionTypes of frictionFactor affecting frictionStatic and Kinetic friction.Difference between uniform and non-uniform motion.Uniform Accelerated MotionDifference between velocity and accelerationDifference between speed and velocityExploring forcesInteraction of forcesDistance and DisplacementScalar and Vectors Comment More infoAdvertise with us Next Article Rest and Motion R rahulmahajann Follow Improve Article Tags : School Learning Class 9 Physics Physics-Class-9 Similar Reads Physics Tutorial The term "physics" is derived from the Greek word physis (meaning “natureâ€) and physika (meaning “natural thingsâ€). 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Imagine three bowls—one filled with water and the other with oil and honey. If you were to tip the three bowls and observe the flow, you’d quickly notice that water pours out much faster than oil and hon 10 min read Buoyant ForceBuoyancy is a phenomenon due to the buoyant force that causes an object to float. When you put an object in a liquid, an upward force is exerted on the object by the liquid. This force is equal to the weight of the liquid that has been displaced. The amount of liquid that has been displaced depends 13 min read Archimedes PrincipleArchimedes Principle is a fundamental concept in fluid mechanics, credited to the ancient Greek mathematician and physicist Archimedes. According to Archimedes' Principle, when an object is immersed in a fluid the object experiences an upward force whose magnitude is equal to the weight of the fluid 12 min read Pascal's LawPascal's law establishes the relation between pressure and the height of static fluids. A static fluid is defined as a fluid that is not in motion. When the fluid is not flowing, it is said to be in hydrostatic equilibrium. For a fluid to be in hydrostatic equilibrium, the net force on the fluid mus 10 min read Reynolds NumberAs liquid runs into a channel, it collides with the pipe. Engineers ensure that the liquid flow through the city's pipes is as consistent as possible. As a result, a number known as the Reynolds number predicts whether the flow of the liquid will be smooth or turbulent. Sir George Stoke was the firs 6 min read Streamline FlowThe substance that can change its form under an external force is defined as fluid. Whenever an external force is applied to a fluid, it begins to flow. The study of fluids in motion is defined as fluid dynamics. Have you ever noticed a creek flowing beneath the bridge? When you see a streamline, wh 7 min read Laminar and Turbulent FlowLaminar flow and turbulent flow describe the movement patterns of fluids. Laminar flow is characterized by smooth, orderly layers of fluid sliding over one another without mixing, ideal for scenarios where minimal resistance is desired. Turbulent flow features chaotic, swirling patterns with irregul 9 min read Bernoulli's PrincipleBernoulli's Principle, formulated by Daniel Bernoulli and later expressed as Bernoulli's Equation by Leonhard Euler in 1752, is a fundamental concept in fluid mechanics. It describes the relationship between the pressure (P), velocity, and height (h) of a fluid in motion. The principle states that i 14 min read Poiseuilles Law FormulaAccording to Poiseuille's law, the flow of liquid varies depending on the length of the tube, the radius of the tube, the pressure gradient and the viscosity of the fluid. It is a physical law that calculates the pressure drop in an incompressible Newtonian fluid flowing in laminar flow through a lo 4 min read Stoke's LawStoke's Law: Observe a raindrop falling from a height if you look closely you will notice that the speed of all the raindrops is constant and even though it falls from a height under the influence of gravity its velocity seems constant. These questions are answered using Stoke's lawStoke's law was f 11 min read Solid MechanicsWhat is Stress?Stress in physics is defined as the force exerted on the unit area of a substance. Stress affects the body as strain in which the shape of the body changes if the stress is applied and sometimes it gets permanently deformed. On the basis of the direction of force applied to the body, we can categori 9 min read Stress and StrainStress and Strain are the two terms in Physics that describe the forces causing the deformation of objects. Deformation is known as the change of the shape of an object by applications of force. The object experiences it due to external forces; for example, the forces might be like squeezing, squash 12 min read Stress-Strain CurveStress-Strain Curve is a very crucial concept in the study of material science and engineering. It describes the relationship between stress and the strain applied on an object. We know that stress is the applied force on the material, and strain, is the resulting change (deformation or elongation) 11 min read Elasticity and PlasticityYou've undoubtedly heard of the idea of elasticity by now. In layman's words, it indicates that after being stretched, some substances return to their former form. You've experimented with a slingshot. Didn't you? That is an elastic substance. Let us go into the ideas of elasticity and plasticity to 9 min read Modulus of ElasticityModulus of Elasticity or Elastic Modulus is the measurement of resistance offered by a material against the deformation force acting on it. Modulus of Elasticity is also called Young's Modulus. It is given as the ratio of Stress to Strain. The unit of elastic modulus is megapascal or gigapascal Modu 12 min read Modulus of RigidityModulus of rigidity also known as shear modulus, is used to measure the rigidity of a given body. It is the ratio of shear stress to shear strain and is denoted by G or sometimes by S or μ. The modulus of rigidity of a material is directly proportional to its elastic modulus which depends on the mat 11 min read Young's ModulusYoung's Modulus is the ratio of stress and strain. It is named after the famous British physicist Thomas Young. It is also known as the "Modulus of Elasticity" and is a fundamental property that describes the relationship between stress and strain in elastic materials. It explains how a material def 8 min read Bulk Modulus FormulaThe modulus of elasticity measures a material's resistance to elastic deformation under external forces. Understanding this property is important for designing structures with materials like metals, concrete, and polymers to ensure they can withstand stresses without permanent deformation.The modulu 7 min read Shear Modulus and Bulk ModulusA rigid body model is an idealised representation of an item that does not deform when subjected to external forces. It is extremely beneficial for evaluating mechanical systems—and many physical items are quite stiff. The degree to which an item may be regarded as stiff is determined by the physica 7 min read Poisson's RatioPoisson's Ratio is the negative ratio of transversal strain or lateral strain to the longitudinal strain of a material under stress. When a material particularly a rubber-like material undergoes stress the deformation is not limited to only one direction, rather it happens along both transversal and 9 min read Stress, Strain and Elastic Potential EnergyElasticity, this term always reminds of objects like Rubber bands, etc. However, if the question arises, which one is more elastic- A rubber or an Iron piece? The answer will be an Iron piece. Why? The answer lies in the definition of Elasticity, elasticity is known to be the ability of the object t 9 min read ThermodynamicsBasics Concepts of ThermodynamicsThermodynamics is concerned with the ideas of heat and temperature, as well as the exchange of heat and other forms of energy. The branch of science that is known as thermodynamics is related to the study of various kinds of energy and its interconversion. The behaviour of these quantities is govern 12 min read Zeroth Law of ThermodynamicsZeroth Law of Thermodynamics states that when two bodies are in thermal equilibrium with another third body than the two bodies are also in thermal equilibrium with each other. Ralph H. Fowler developed this law in the 1930s, many years after the first, second, and third laws of thermodynamics had a 7 min read First Law of ThermodynamicsFirst Law of Thermodynamics adaptation of the Law of Conservation of Energy differentiates between three types of energy transfer: Heat, Thermodynamic Work, and Energy associated with matter transfer. It also relates each type of energy transfer to a property of a body's Internal Energy. The First L 8 min read Second Law of ThermodynamicsSecond Law of Thermodynamics defines that heat cannot move from a reservoir of lower temperature to a reservoir of higher temperature in a cyclic process. The second law of thermodynamics deals with transferring heat naturally from a hotter body to a colder body. Second Law of Thermodynamics is one 10 min read Thermodynamic CyclesThermodynamic cycles are used to explain how heat engines, which convert heat into work, operate. A thermodynamic cycle is used to accomplish this. The application determines the kind of cycle that is employed in the engine. The thermodynamic cycle consists of a series of interrelated thermodynamic 15 min read Thermodynamic State Variables and Equation of StateThe branch of thermodynamics deals with the process of heat exchange by the gas or the temperature of the system of the gas. This branch also deals with the flow of heat from one part of the system to another part of the system. For systems that are present in the real world, there are some paramete 5 min read Enthalpy: Definition, Formula and ReactionsEnthalpy is the measurement of heat or energy in the thermodynamic system. It is the most fundamental concept in the branch of thermodynamics. It is denoted by the symbol H. In other words, we can say, Enthalpy is the total heat of the system. Let's know more about Enthalpy in detail below.Enthalpy 12 min read State FunctionsState Functions are the functions that are independent of the path of the function i.e. they are concerned about the final state and not how the state is achieved. State Functions are most used in thermodynamics. In this article, we will learn the definition of state function, what are the state fun 7 min read Carnot EngineA Carnot motor is a hypothetical motor that works on the Carnot cycle. Nicolas Leonard Sadi Carnot fostered the fundamental model for this motor in 1824. In this unmistakable article, you will find out about the Carnot cycle and Carnot Theorem exhaustively. The Carnot motor is a hypothetical thermod 5 min read Heat Engine - Definition, Working, PV Diagram, Efficiency, TypesHeat engines are devices that turn heat energy into motion or mechanical work. Heat engines are based on the principles of thermodynamics, specifically the conversion of heat into work according to the first and second laws of thermodynamics. They are found everywhere, from our cars, power plants to 14 min read Wave and OscillationIntroduction to Waves - Definition, Types, PropertiesA wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities in physics, mathematics, and related subjects, commonly described by a wave equation. At least two field quantities in the wave medium are involved in physical waves. Periodic waves occur when variables o 11 min read Wave MotionWave Motion refers to the transfer of energy and momentum from one point to another in a medium without actually transporting matter between the two points. Wave motion is a kind of disturbance from place to place. Wave can travel in solid medium, liquid medium, gas medium, and in a vacuum. Sound wa 12 min read OscillationOscillations are defined as the process of repeating vibrations of any quantity about its equilibrium position. The word “oscillation†originates from the Latin verb, which means to swing. An object oscillates whenever a force pushes or pulls it back toward its central point after displacement. This 8 min read Oscillatory Motion FormulaOscillatory Motion is a form of motion in which an item travels over a spot repeatedly. The optimum situation can be attained in a total vacuum since there will be no air to halt the item in oscillatory motion friction. Let's look at a pendulum as shown below. The vibrating of strings and the moveme 3 min read Amplitude FormulaThe largest deviation of a variable from its mean value is referred to as amplitude. It is the largest displacement from a particle's mean location in to and fro motion around a mean position. Periodic pressure variations, periodic current or voltage variations, periodic variations in electric or ma 6 min read What is Frequency?Frequency is the rate at which the repetitive event that occurs over a specific period. Frequency shows the oscillations of waves, operation of electrical circuits and the recognition of sound. The frequency is the basic concept for different fields from physics and engineering to music and many mor 9 min read Amplitude, Time Period and Frequency of a VibrationSound is a form of energy generated by vibrating bodies. Its spread necessitates the use of a medium. As a result, sound cannot travel in a vacuum because there is no material to transfer sound waves. Sound vibration is the back and forth motion of an entity that causes the sound to be made. That is 5 min read Energy of a Wave FormulaWave energy, often referred to as the energy carried by waves, encompasses both the kinetic energy of their motion and the potential energy stored within their amplitude or frequency. This energy is not only essential for natural processes like ocean currents and seismic waves but also holds signifi 7 min read Simple Harmonic MotionSimple Harmonic Motion is a fundament concept in the study of motion, especially oscillatory motion; which helps us understand many physical phenomena around like how strings produce pleasing sounds in a musical instrument such as the sitar, guitar, violin, etc., and also, how vibrations in the memb 15+ min read Displacement in Simple Harmonic MotionThe Oscillatory Motion has a big part to play in the world of Physics. Oscillatory motions are said to be harmonic if the displacement of the oscillatory body can be expressed as a function of sine or cosine of an angle depending upon time. In Harmonic Oscillations, the limits of oscillations on eit 10 min read SoundProduction and Propagation of SoundHave you ever wonder how are we able to hear different sounds produced around us. How are these sounds produced? Or how a single instrument can produce a wide variety of sounds? Also, why do astronauts communicate in sign languages in outer space? A sound is a form of energy that helps in hearing to 6 min read What are the Characteristics of Sound Waves?Sound is nothing but the vibrations (a form of energy) that propagates in the form of waves through a certain medium. Different types of medium affect the properties of the wave differently. Does this mean that Sound will not travel if the medium does not exist? Correct. It will not, It is impossibl 7 min read Speed of SoundSpeed of Sound as the name suggests is the speed of the sound in any medium. We know that sound is a form of energy that is caused due to the vibration of the particles and sound travels in the form of waves. A wave is a vibratory disturbance that transfers energy from one point to another point wit 12 min read Reflection of SoundReflection of Sound is the phenomenon of striking of sound with a barrier and bouncing back in the same medium. It is the most common phenomenon observed by us in our daily life. Let's take an example, suppose we are sitting in an empty hall and talking to a person we hear an echo sound which is cre 9 min read Refraction of SoundA sound is a vibration that travels as a mechanical wave across a medium. It can spread via a solid, a liquid, or a gas as the medium. In solids, sound travels the quickest, comparatively more slowly in liquids, and the slowest in gases. A sound wave is a pattern of disturbance caused by energy trav 5 min read How do we hear?Sound is produced from a vibrating object or the organ in the form of vibrations which is called propagation of sound and these vibrations have to be recognized by the brain to interpret the meaning which is possible only in the presence of a multi-functioning organ that is the ear which plays a hug 7 min read Audible and Inaudible SoundsWe hear sound whenever we talk, listen to some music, or play any musical instrument, etc. But did you ever wondered what is that sound and how is it produced? Or why do we hear to our own voice when we shout in a big empty room loudly? What are the ranges of sound that we can hear? In this article, 10 min read Explain the Working and Application of SONARSound energy is the type of energy that allows our ears to sense something. When a body vibrates or moves in a ‘to-and-fro' motion, a sound is made. Sound needs a medium to flow through in order to propagate. This medium could be in the form of a gas, a liquid, or a solid. Sound propagates through a 8 min read Noise PollutionNoise pollution is the pollution caused by sound which results in various problems for Humans. A sound is a form of energy that enables us to hear. We hear the sound from the frequency range of 20 to 20000 Hertz (20kHz). Humans have a fixed range for which comfortably hear a sound if we are exposed 8 min read Doppler Effect - Definition, Formula, ExamplesDoppler Effect is an important phenomenon when it comes to waves. This phenomenon has applications in a lot of fields of science. From nature's physical process to planetary motion, this effect comes into play wherever there are waves and the objects are traveling with respect to the wave. In the re 7 min read Doppler Shift FormulaWhen it comes to sound propagation, the Doppler Shift is the shift in pitch of a source as it travels. The frequency seems to grow as the source approaches the listener and decreases as the origin fades away from the ear. When the source is going toward the listener, its velocity is positive; when i 3 min read ElectrostaticsElectrostaticsElectrostatics is the study of electric charges that are fixed. It includes an study of the forces that exist between charges as defined by Coulomb's Law. The following concepts are involved in electrostatics: Electric charge, electric field, and electrostatic force.Electrostatic forces are non cont 13 min read Electric ChargeElectric Charge is the basic property of a matter that causes the matter to experience a force when placed in a electromagnetic field. It is the amount of electric energy that is used for various purposes. Electric charges are categorized into two types, that are, Positive ChargeNegative ChargePosit 8 min read Coulomb's LawCoulomb’s Law is defined as a mathematical concept that defines the electric force between charged objects. Columb's Law states that the force between any two charged particles is directly proportional to the product of the charge but is inversely proportional to the square of the distance between t 9 min read Electric DipoleAn electric dipole is defined as a pair of equal and opposite electric charges that are separated, by a small distance. An example of an electric dipole includes two atoms separated by small distances. The magnitude of the electric dipole is obtained by taking the product of either of the charge and 11 min read Dipole MomentTwo small charges (equal and opposite in nature) when placed at small distances behave as a system and are called as Electric Dipole. Now, electric dipole movement is defined as the product of either charge with the distance between them. Electric dipole movement is helpful in determining the symmet 6 min read Electrostatic PotentialElectrostatic potential refers to the amount of electrical potential energy present at a specific point in space due to the presence of electric charges. It represents how much work would be done to move a unit of positive charge from infinity to that point without causing any acceleration. The unit 12 min read Electric Potential EnergyElectrical potential energy is the cumulative effect of the position and configuration of a charged object and its neighboring charges. The electric potential energy of a charged object governs its motion in the local electric field.Sometimes electrical potential energy is confused with electric pot 15+ min read Potential due to an Electric DipoleThe potential due to an electric dipole at a point in space is the electric potential energy per unit charge that a test charge would experience at that point due to the dipole. An electric potential is the amount of work needed to move a unit of positive charge from a reference point to a specific 7 min read Equipotential SurfacesWhen an external force acts to do work, moving a body from a point to another against a force like spring force or gravitational force, that work gets collected or stores as the potential energy of the body. When the external force is excluded, the body moves, gaining the kinetic energy and losing a 9 min read Capacitor and CapacitanceCapacitor and Capacitance are related to each other as capacitance is nothing but the ability to store the charge of the capacitor. Capacitors are essential components in electronic circuits that store electrical energy in the form of an electric charge. They are widely used in various applications, 11 min read Like