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 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?
360 J
140 J
80 J
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)
2,200 J
550 J
220 J
What is the kinetic energy of a 200 kg boat moving at 2.7 m/s?
1,458 J
729 J
270 J
A 1.6 kg ball has 80 J of kinetic energy. How fast is it moving?
10 m/s
50 m/s
100 m/s