# Physics - Forces and Energy

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• Created by: becky.65
• Created on: 16-12-15 12:24
When an object starts to move, what must have been applied to it?
A force
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When a force moves an object, what happens?
Energy is transferred and work is done
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What is the energy transferred equal to?
The work done
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What unit do both work and energy have?
Joule, J
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What is work done transferred to when overcoming friction?
It's mainly transferred into energy by heating
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How to brakes work to stop or slow down a moving vehicle?
When the brake are applied, friction between the brake pads and the wheel discs opposes the motion of the vehicle, the kinetic energy of it is then transferred into energy that heats the brake pads and the wheel discs as well as the air
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What is power?
The rate at which energy is transferred
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What is the unit of power?
Watts
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What are watts equal to?
One joule per second
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The work done by a lift motor transfers energy from...?
Electricity to gravitational potential energy. Sound and energy that heats the motor is also produced
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What is gravitational potential energy?
Energy stored in an object because of its position in the Earth's gravitational field
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How does gravitational potential energy increase and decrease?
It increases when an object moves up and decreases when an object moves down
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Why does an object gain gravitational potential energy when it is lifted up?
Because work is done on it to overcome the gravitational force
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What is the gravitational potential energy equal to when an object is moved vertically upwards?
The work done on it by the lifting force
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What is the gravitational field strength on the Earth's surface?
10 Newtons per kilogram
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What type of energy do all moving objects have?
Kinectic energy
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What does the kinetic energy of an object depend on?
Its mass and its speed
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An object is described as being elastic if it does what?
Regains shape after being stretched or squashed
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When work is done on an elastic object, what is the energy transferred to it stored as?
Elastic potential energy
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When the object returns to original shape after being stretched or squashed, what happens?
The elastic potential energy is released
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## Other cards in this set

### Card 2

#### Front

When a force moves an object, what happens?

#### Back

Energy is transferred and work is done

### Card 3

#### Front

What is the energy transferred equal to?

### Card 4

#### Front

What unit do both work and energy have?

### Card 5

#### Front

What is work done transferred to when overcoming friction?