Energy can be described as being in different 'stores'. It cannot be created or destroyed but it can be transferred. This is doing work. The rate of energy transfer or work done is the power.
What is the name of the energy stored by a moving object?
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?
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 → kinetic energy
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)
The spring constant of a spring is 25 N/m. It is extended by 50 cm. How much elastic potential energy is stored?
A 4 kg ball has 50 J of kinetic energy. How fast is it moving?
Which is a correct example of work being done?
An apple sitting still on a table
A shelf holding up a book
A toy car being pushed across the floor
How much work is done by a 10 N force pushing a box 4 m across the floor?
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