Mechanical Energy Formula Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Mechanical Energy - When a force operates on an object to displace it, it is said that work is performed. Work entails the use of a force to shift an object. The object will gather energy after the job is completed on it. Mechanical energy is the amount of energy acquired by a working object. The mechanical energy formula and examples will be discussed in this article, as well as the concept and components of mechanical energy.Table of Content Mechanical EnergyFormula of Mechanical Energy Examples of Mechanical EnergyIs Mechanical Energy Potential or Kinetic? Converting Mechanical Energy to Electrical EnergySample QuestionsMechanical EnergyThe sum of kinetic and potential energy in an object is referred to as Mechanical energy. It builds up as a result of doing a specific task. To put it another way, we can characterize an object's energy based on its velocity or position, or both.Because of its location, we know that the object possesses potential energy. Because some labor will be required to set an object at a specific height. In addition, an object has kinetic energy because of the work it does in order to move. When an object moves, its potential energy is assumed to be zero. Its kinetic energy, on the other hand, will be 0 while it is at rest.Formula of Mechanical EnergyThe formula of Mechanical Energy is as follows,Mechanical Energy (M.E.) = Kinetic Energy (K.E.) + Potential Energy (P.E.)Where, Kinetic Energy (K.E.) = (1/2)mv2Potential Energy (P.E.) = m × g × h∴ Mechanical Energy (M.E.) = ((1/2)mv2) + (m × g × h)Where,m = mass of object,v = velocity of object,g = acceleration due to gravity,h = height of object from ground.Examples of Mechanical EnergyRunning or Walking: When you run or walk, your body converts chemical energy from food into mechanical energy, propelling you forward.Swinging Pendulum: A swinging pendulum exhibits mechanical energy as it oscillates back and forth between potential energy at the highest point of its swing and kinetic energy at the lowest point.Moving Vehicles: Cars, trains, bicycles, and other vehicles convert fuel or human energy into mechanical energy to move from one place to another.Stretching a Spring: When you stretch a spring, you are applying a force to displace it, storing potential mechanical energy within the spring.Rotating Blades: Wind turbines and propellers on airplanes convert wind or engine power into mechanical energy to generate electricity or propel the aircraft forward.Is Mechanical Energy Potential or Kinetic? Mechanical energy can be either potential or kinetic. Potential energy relates to an object's position or condition, while kinetic energy is linked to its movement. Think of a raised weight (potential energy) versus a moving ball (kinetic energy).Converting Mechanical Energy to Electrical EnergyConverting mechanical energy to electrical energy involves transforming the physical motion or potential energy of mechanical systems into electrical power.This process is utilized in various technologies such as generators, where mechanical forces, such as wind or water currents, rotate turbines.Turbines convert mechanical energy into electrical energy through electromagnetic induction.Piezoelectric materials can also convert mechanical stress or vibration directly into electrical energy.Applications of this conversion include sensors, energy harvesting devices, and wearable technology.Related Article How to calculate the Mechanical Energy?Energy ConversionEnergyKinetic EnergyLaw of Conservation of EnergyUses of Electricity in Daily Life Sample QuestionsQuestion 1: Define Mechanical energy.Answer:The sum of kinetic and potential energy in an object is referred to as mechanical energy. Kinetic energy of an object is related to its motion and potential energy is related to its position. If there is not motion in the object, the total mechanical energy will only be the potential energy present in it, similarly, if the object's position is not changed, neither the object's orientation, then the object has no potential energy.Question 2: A body flying at a specific altitude from the ground has 500 J of kinetic energy and 738 J of potential energy. Calculate the total mechanical energy that is involved.Solution:Given: K.E. = 500 J, P.E. = 738 JSince,Mechanical Energy (M.E.) = Kinetic Energy (K.E.) + Potential Energy (P.E.)∴ M.E. = 500 + 738∴ M.E. = 1238 JQuestion 3: A person sits on a building with a height of 23 m and a mass of 150 kg. Determine how much mechanical energy there is.Solution:Given: h = 23 m, m = 150 kg, K.E. = 0 (Person in static position)Since,Mechanical Energy (M.E.) = ((1/2)mv2) + (m × g × h)∴ M.E = 0 + 150 × 9.81 × 23∴ M.E. = 150 × 9.81 × 23∴ M.E. = 33810 JQuestion 4: Calculate the mechanical energy of a 21 kg item that is traveling at a 10 ms-1 speed.Solution:Given: m = 21 kg, v = 10 ms-1, P.E = 0 (Object is moving)Since,Mechanical Energy (M.E.) = ((1/2)mv2) + (m × g × h)∴ M.E. = ((1/2) × 21 × 102)) + 0∴ M.E. = 1050 JQuestion 5: If the kinetic energy of an object is 230 J and the potential energy of an object is 300 J then find the Mechanical energy.Solution:Given: K.E. = 230 J, P.E. = 300 JSince,Mechanical Energy (M.E.) = Kinetic Energy (K.E.) + Potential Energy (P.E.)∴ M.E. = 230 + 300∴ M.E. = 530 JQuestion 6: Calculate the mechanical energy when the car traveled at a speed of 18 m/s and its mass is 7 kg.Solution:Given: m = 7 kg, v = 18 ms-1, P.E = 0 (car is moving)Since,Mechanical Energy (M.E.) = ((1/2)mv2) + (m × g × h)∴ M.E. = ((1/2) × 7 × 182)) + 0∴ M.E. = 1134 JConclusion of Mechanical Energy Mechanical energy is a fundamental concept in physics that encompasses both potential and kinetic forms. Whether it's the stored energy of an object's position or the energy of its movement, mechanical energy plays a crucial role in various natural phenomena and human-made technologies. Understanding how mechanical energy works allows us to harness it for practical applications, from generating electricity to powering everyday devices. This energy conversion process continues to drive innovation and shape our modern world. Comment More infoAdvertise with us S swapnilkalyani96 Follow Improve Article Tags : School Learning Class 9 Physics Physics-Formulas Physics-Class-9 +1 More 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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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