Kinetic energy (KE) is energy of motion. A moving car has a lot of kinetic energy. From PE to KE. These skydivers have potential energy due to being high up. After they jump this potential energy gets converted into kinetic energy (and heat) as they speed up. Gravitational Potential Energy. When the PE is due to an objects height then. A: The formula for average kinetic energy is one-half the mass times the square of the velocity. Using mathematical notation, the formula can be written as KE.
Calculation of energy changes Calculating kinetic energyThe amount of in a moving object can be calculated using the equation:This is when:. kinetic energy ( E k ) is measured in joules (J). mass ( m ) is measured in kilograms (kg).
speed ( v ) is measured in metres per second (m/s)ExampleAn apple of mass 100 g falls from a tree. It reaches a speed of 6 m/s before landing on Isaac’s head. What is the gain of kinetic energy of the apple?QuestionHow much kinetic energy does a 30 kg dog have when it runs at 4 m/s? Reveal answer. DownCalculating elastic potential energyThe amount of stored in a stretched spring can be calculated using the equation:This is when:. elastic potential energy ( E e ) is measured in joules (J).
spring constant ( k ) is measured in newtons per metre (N/m). extension ( e ) is measured in metres (m)ExampleRobert stretches a spring with a spring constant of 3 N/m until it is extended by 50 cm. What is the elastic potential energy stored by the spring?QuestionHow much elastic potential energy does a spring store when it is compressed by 0.2 m if it has a spring constant of 5 N/m? Reveal answer. DownCalculating gravitational potential energyThe amount of stored by an object at height can be calculated using the equation:Gravitational potential energy = mass × gravitational field strength × heightThis is when:. gravitational potential energy ( E p ) is measured in joules (J).
mass ( m ) is measured in kilograms (kg). gravitational field strength ( g ) is measured in newtons per kilogram (N/kg. height ( h ) is measured in metres (m)ExampleGalileo takes a 5 kg cannonball to the top of the Tower of Pisa for one of his experiments.
The tower is 56 m high. How much gravitational potential energy has the cannonball gained? (g = 10 N/kg)QuestionHow much gravitational potential energy does a 500 g book gain when it is lifted up 1.5 m onto a shelf? Reveal answer.
Translational kinetic energy of a body is equal to one-half the product of its mass, m, and the square of its, v, or 1/ 2 mv 2.This formula is valid only for low to relatively high speeds; for extremely high-speed particles it yields values that are too small. When the speed of an object approaches that of (3 × 10 8 metres per second, or 186,000 miles per second), its mass increases, and the laws of must be used. Is equal to the increase in the mass of a particle over that which it has at rest multiplied by the square of the.