P3d-work And Power

Question 1

What are some everyday examples where work is done and power is developed?

Answer 1

Lifting weights
Climbing stairs
Pulling a sledge
Pushing a shopping trolley

Question 2

What is power?

Answer 2

How quickly work is being done

Question 3

How is energy transferred when work is done?

Answer 3

• supply of energy
• transfers energy received into other forms
• transferred usefully/wasted

Question 4

What does the amount of work done depend on?

Answer 4

The size of force in newtons

The distance travelled in metres

Question 5

What is the unit for both work and energy?

Answer 5

JOULE

Question 6

What is power measured in?

Answer 6

Watts(W)

Question 7

What is fuel consumption?

Answer 7

The amount of fuel used

Question 8

How does the weight of a car affect fuel consumption?

Answer 8

Heavier car, higher fuel consumption

More energy needed from fuel

Question 9

What are the environmental issues with cars?

Answer 9

• Cars burn fuel they release emissions

- higher fuel consumption greater the emissions

Question 10

What is doing work?

Answer 10

Applying a force to move an object in the direction of the force