## Power And Work Answers

## 1. What is the equation used to calculate power?

## Work done / time

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## 2. What are the units for power?

## Watts

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## 3. What are the units for work done?

## Joules

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## 4. What is the equation used to calculate work done?

## Force x distance moved

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## 5. What is the equation used to calculate kinetic energy?

## 0.5 x mass x velocity ^2

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## 6. What would the work done be when a one-kilogram brick is carried up a ladder that is 15 metres tall?

## 150 J

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## 7. How can we calculate gravitational potential energy on Earth?

## mass × height × gravitational field strength (g)

## Gravitational field strength is 10 on earth

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## 8. If a motor does 500 J of work to lift a 100 N weight, how high was the weight lifted?

## 5 M

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## 9. Define power

## work done/time or rate of work done

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## 10. How much work is done by a 12N force pushing a box 4 m across the floor?

## 48 J

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