The amount of energy in a system can be changed. It cannot be created or destroyed but it can be transferred, dissipated or stored in different ways.
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 a pencil falling from a table?
Kinetic energy → elastic potential energy
Chemical energy → gravitational potential energy
Gravitational potential energy → kinetic energy
What is the main energy transfer for a vehicle slowing down?
Kinetic energy → chemical energy
Kinetic energy → thermal energy
Chemical energy → kinetic energy
Which of these cannot happen to energy?
Energy cannot be stored
Energy cannot be dissipated
Energy cannot be created
If 220 J of energy is transferred and 140 J is usefully stored, how much energy is wasted?
What happens to 'dissipated' energy?
It is transferred to useful stores
It disappears from the system
It spreads out into the surroundings
What is the gravitational potential energy stored in a 55 kg teenager sitting at the top of a 4 m high tree? (g = 10 N/kg)
What is the kinetic energy of a 200 kg boat moving at 2.7 m/s?
A 1.6 kg ball has 80 J of kinetic energy. How fast is it moving?