# 1.3.1 WORK AND CONSERVATION OF ENERGY

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Define work done by a force
product of the force and the distance moved by the force in the direction of the force
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Define the joule
work done when force of 1N travels through a distance of 1m
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When is work done?
when a force is moved past its point of application// energy is transferred // KE lost = work done + heat/sound energy
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When is work not done?
no movement, no work done // if force acts at right angles
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What is the principle of conservation of energy?
total energy of a closed system must be constant // energy is neither wasted or destroyed, it changes form // total energy of the universe is constant
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What happens when an object is lifted?
work is done against the force of gravity // transferred gravitational potential energy energy to the object
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What is gravitational potential energy?
energy possessed by an object due to its position or height above earth
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How is GPE and KE related?
GPE at top = KE at bottom // as object falls GPE is transferred to KE
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## Other cards in this set

### Card 2

Define the joule

#### Back

work done when force of 1N travels through a distance of 1m

### Card 3

#### Front

When is work done?

### Card 4

#### Front

When is work not done?

### Card 5

#### Front

What is the principle of conservation of energy?