# Forces and energy

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• Created by: Emily1
• Created on: 26-06-13 21:01
How much work is done lifting a 250 N box by 2 m?
500 J
1 of 9
What force is needed to do 500 J of work over a distance of 5 m?
500 ÷ 5 = 100 N
2 of 9
What is the power of a machine that does 2000 J of work in 5 s?
400 W
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How much work can a 500 W machine do in 1 minute?
500 × 1 × 60 = 30 000 J
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How much GPE does a roller coaster car of mass 1000 kg lose when it drops 5 m?
1000 × 10 × 5 = 50 000 J
5 of 9
At the bottom of its swing, a pendulum has:
Minimum GPE and maximum kinetic energy
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A car has more kinetic energy when
It is driven faster
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Ek = ½mv2 - what is the kinetic energy of a 3 kg object travelling at 2 m/s?
½ × 3 × 2 × 2 = 6 J
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What is the kinetic energy of a 1000 kg car driven at 13 m/s?
84 500 J
9 of 9

## Other cards in this set

### Card 2

#### Front

What force is needed to do 500 J of work over a distance of 5 m?

500 ÷ 5 = 100 N

### Card 3

#### Front

What is the power of a machine that does 2000 J of work in 5 s?

### Card 4

#### Front

How much work can a 500 W machine do in 1 minute?

### Card 5

#### Front

How much GPE does a roller coaster car of mass 1000 kg lose when it drops 5 m?