Review (Energy, work and power)

• 2000 J

• 8000 J

• 10000 J

• 12000J

• A

• B

• C

• D

• A

• B

• C

• D

Two workers are stacking cans on to a shelf in a shop.

The workers lift the same number of identical cans on to the same shelf from the same level. Worker P takes 3.0 minutes to lift the cans. Worker Q takes 4.0 minutes to lift the cans.

Which statement about the workers is correct?

• Worker P develops less useful power than worker Q.

• Worker P develops more useful power than worker Q.

• Worker P does less useful work than worker Q.

• Worker P does more useful work than worker Q.

Which quantities are measured in the same unit?

• energy, power and work

• energy and power, but not work

• energy and work, but not power

• power and work, but not energy

• lifting the box quickly to the high shelf

• lifting the box slowly to the high shelf

• lifting the box to the low shelf first then lifting it to the high shelf

• lifting the box to the low shelf instead of to the high shelf

• A

• B

• C

• D

• A

• B

• C

• D

. A lorry of mass 6000 kg is travelling at a speed of 2.0 m/ s. A car has a mass of 60 kg. The kinetic energy of the car is equal to the kinetic energy of the lorry. What is the speed of the car?

• 5 m/s

• 10 m/s

• 15 m/s

• 20 m/s

A force acts on an object and causes the object to move a certain distance, in the same direction as the force.

Which row represents a situation in which the largest amount of work is done on the object by the force?

• A

• B

• C

• D