MEDIUM
AS and A Level
IMPORTANT
Earn 100

A climber of mass 100 kg (including the equipment she is carrying) ascends from sea level to the top of a mountain 5500 m high. Calculate the change in

her gravitational potential energy.

Important Questions on Work, Energy and Power

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 8

A toy car works by means of a stretched rubber band. What form of potential energy does the car store when the band is stretched?

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 8
A bar magnet is lying with its north pole next to the south pole of another bar magnet. A student pulls them apart. Why do we say that the magnets' potential energy has increased? Where has this energy come from?
MEDIUM
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 9

Which has more k.e., a car of mass 500 kg travelling at 15 ms-1 or a motorcycle of mass 250 kg travelling at 30 m s-1?

MEDIUM
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 10
Calculate the change in kinetic energy of a ball of mass 200 g when it bounces. Assume that it hits the ground with a speed of 15.8 ms-1 and leaves it at 12.2 ms-1.
MEDIUM
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 11

Calculate the velocity for a brass sphere of mass 10 kg, and show that you get the same result. Repeat with any other value of mass.

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 12
Calculate how much gravitational potential energy is lost by an aircraft of mass 80000 kg if it descends from an altitude of 10000 m to an altitude of 1000 m. What happens to this energy if the pilot keeps the aircraft's speed constant?
EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Questions>Q 13

A high diver (see Figure) reaches the highest point in her jump with her centre of gravity 10m above the water.

Question Image

A high dive is an example of converting (transforming) gravitational potential energy to kinetic energy.

What is her speed just before the point where she enters the water is

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 5 - Work, Energy and Power>Question>Q 14

A stone falls from the top of a cliff, 80 m high. When it reaches the foot of the cliff, its speed is 38 m s-1

(a) Calculate the proportion of the stone's initial g.p.e. that is converted to k.e.