P1

What is the name of the energy stored by a moving object?

• Elastic potential energy

• Kinetic energy

• Gravitational potential energy

Where might elastic potential energy be stored

• In a stretched catapult

• In a catapult stored in a cupboard

• In a candle

What is the main energy transfer for an apple falling from a tree?

• Kinetic energy → elastic potential energy

• Chemical energy → gravitational potential energy

• Gravitational potential energy → kinetic energy

What is the main energy transfer for a long-distance runner?

• Kinetic energy → chemical energy

• Chemical energy → gravitational potential energy

• Chemical energy → kinetic energy

Which of these cannot happen to energy?

• Energy cannot be stored

• Energy cannot be dissipated

• Energy cannot be created

What is the gravitational potential energy stored in a 60 kg child sitting at the top of a 2 m high slide? (g = 10 N/kg)

• 1,200 J

• 600 J

• 120 J

What are the correct units for work?

• Work is measured in joules (J)

• Work is measured in amps (A)

• Work is measured in newtons (N)

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

• 40 J

• 14 J

• 2.5 J

Which of the following is a definition of power?

• The amount of work done by a certain force

• The energy transferred × time taken

• The amount of work done ÷ time taken

Which is the best insulator?

• Copper

• Tin

• Wood