Energy review (CIE KS3 Year 7)

Which of the following are types of energy?

• Light, thermal, hunger, protein

• Sound, vacuum, force

• Light, thermal, sound

• Force, movement, thermal, the Sun

What is the main way a car loses energy?

• Sound (making noise)

• Thermal dissipation (heat from the engine)

• Light (from the headlights)

• Friction (from the wheels)

Energy that is transferred to the surroundings by heating or sound becomes very difficult to use for doing anything else. We say the energy is __________.

What happens to the kinetic (movement) energy when a dropped ball bounces?

• the ball stores energy when it changes shape

• the ball loses all its energy to sound

• the ball produces lots of light energy

• the ball makes a sound

Which energy changes are useful and wasteful in a light bulb?

• Useful: sound. Waste: heat.

• Useful: heat. Waste: sound.

• Useful: sound. Waste: light.

• Useful: light. Waste: heat.

What is a store of chemical energy?

• Materials in batteries and food

• Moving and jumping

• Falling from the sky

• Shining a light

What energy transformation happens in a mobile phone?

• Money changes to texts and messages

• Electricity changes to heat and light and sound

• Sound changes to electricity

• Vibrations change to sound

What is energy?

• The ability to make people happy

• The ability to do work

• The ability to cook dinner

• The ability the stretch and crush objects

What is an independent variable?

• A variable you decide to change

• A variable you decide to keep the same

• A variable that doesn't live with its parents

• A variable that you investigate

What is a control variable?

• A variable that doesn't like changing

• A variable that doesn't waste energy

• A variable you investigate

• A variable you keep the same