# Physics - Work, Energy and Momentum

Physics - Work, Energy and Momentum - Old Specification P2

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• Created by: EMayH
• Created on: 07-04-10 13:19

## Question 1.

What is work?

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When an object is moved by a force, we say work is done on the object by the force.

Work done = Energy Transferred

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## Question 2.

What is the equation for work done?

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Work done = force x distance moved in direction of the force

(joules,j) (newtons,N) (metres,m)

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## Question 3

How do you work out the gain in gravitational potential energy?

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Gain in gravitational potential energy = work done

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## Question 4.

What is elastic potential energy?

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Elastc potential energy is the energy stored in an elastic object when work is done on the object.

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## Question 5.

What does the kinetic energy of a moving object depend on?

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The mass of the object and its speed.

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## Question 6.

What is the equation for kinetic energy (with units) ?

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Kinetic energy = 1/2 x mass x speed(squared)

(joules,J) (kilograms, kg) metre/second squared, m/s squared

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## Question 7

What is the unit of momentum?

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The unit of momentum is the kilogram metre/second (kg m/s)

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## Question 8.

What is the equation (with units) for momentum?

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Momentum = mass x velocity

(kg m/s) (kilograms, kg) (metres per second,m/s)

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## Question 9.

What happens to the momentum in a collision or explosion provided no external forces act on the objects that collide or explode?

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The momentum is conserved.

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## Question 10.

How do you work out the momentum there was before a collision, after the collision has happened?

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Momentum of A + Momentum of B

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