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
3 of 9
How much work can a 500 W machine do in 1 minute?
500 × 1 × 60 = 30 000 J
4 of 9
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
6 of 9
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
8 of 9
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?

Back

500 ÷ 5 = 100 N

Card 3

Front

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

Back

Preview of the front of card 3

Card 4

Front

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

Back

Preview of the front of card 4

Card 5

Front

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

Back

Preview of the front of card 5
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