10 questions🇬🇧English
⚡ Energy Stores & Transfers – Year 9
Physics · Year 9 (KS3) — practise energy stores, conservation of energy, Sankey diagrams and efficiency
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Questions
A stretched elastic band is about to be let go. In which energy store is most of its energy?
Gravitational potential store
Elastic potential store
Chemical store
Kinetic store
20s
A power station splits uranium atoms to release energy. Which energy store is the energy coming from?
Chemical store
Nuclear store
Elastic potential store
Thermal store
20s
Which statement describes the law of conservation of energy?
Energy is destroyed when it is wasted
Energy cannot be created or destroyed
Energy is used up when it is transferred
Energy can be created from nothing by machines
20s
A ball is dropped from a height. Ignoring air resistance, which energy transfer happens as it falls?
Gravitational potential store to elastic store
Chemical store to kinetic store
Kinetic store to gravitational potential store
Gravitational potential store to kinetic store
30s
A battery-powered fan is switched on. By which pathway is energy transferred from the battery to the motor?
By radiation
By heating
Mechanically
Electrically
30s
In a Sankey diagram, what does the width of each arrow show?
The distance the energy travels
The amount of energy transferred
The type of energy store
The time the transfer takes
20s
A lamp is supplied with 200 J of energy and gives out 50 J as light. What is its efficiency?
50%
25%
75%
40%
30s
A swinging pendulum slowly stops. What has happened to the energy it had at the start?
It stayed in the pendulum’s kinetic store
It was destroyed by air resistance
It was changed back into the chemical store
It was transferred to the thermal store of the surroundings
30s
An electric motor is 40% efficient. It is supplied with 600 J of energy. How much energy is transferred usefully?
360 J
150 J
240 J
400 J
60s
A kettle is 80% efficient and transfers 1600 J usefully to the water. What is the total energy input?
1920 J
1280 J
2400 J
2000 J
60s