P1: Conservation and dissipation of energy

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

• Kinetic energy

• Elastic potential 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?

• Gravitational potential energy → kinetic energy

• Kinetic energy → elastic potential energy

• Chemical energy → gravitational potential energy

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

• Chemical energy → kinetic energy

• Kinetic energy → chemical energy

• Chemical energy → gravitational potential energy

Which of these cannot happen to energy?

• Energy cannot be created or destroyed

• Energy cannot be stored

• Energy cannot be dissipated

If 4,000 J of energy is transferred and 2,500 J is usefully stored, how much energy is wasted?

• 1,500 J

• 6,500 J

• 3,250 J

What happens to 'dissipated' energy?

• It spreads out into the surroundings

• It is transferred to useful stores

• It disappears from the system

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

The spring constant of a spring is 25 N/m. The spring is extended by 50 cm. How much elastic potential energy is stored?

• 3.125 J

• 31,250 J

• 1,250 J

Which is a correct example of work being done?

• A toy car being pushed across the floor

• An apple sitting still on a table

• A shelf holding up a book