3.5 Energy [Must Do]

What is the unit of energy?

• Watt, W

• Newton, N

• Joule, J

• kilogram, kg

Name the energy store in food.

Name the energy store in gasoline (petrol).

Name the energy store in a falling rock. There may be more than one energy.

Name the energy store in a book that has been lifted up onto a shelf.

Look at the picture of the circuit.

(a) ................................ energy is stored in the battery.

(b) ............................ energy is transferred in the wires.

Name two energy stores that will last for a long time.

Name one energy store, apart from thermal energy, that will not last for a long time.

Match the following:

• energy transferred from vibrations

• sound

• energy stored in fuel

• gravitational potential

• energy in objects that are lifted higher

• electrical

• energy transferred by current in wires

• chemical

Answer explanation

Gravitational potential is energy stored in objects that are lifted higher.

Electrical energy is energy transferred by current in wires.

Chemical energy stored in fuel.

Sound energy transferred from vibrations.

Match the following

• light

• energy stored in hot objects

• thermal

• energy that we can see

• elastic

• energy stored in an object that has changed shape

• kinetic

• energy of moving objects

Answer explanation

Elastic energy stored in an object that has changed shape.

Thermal energy stored in hot objects.

Light energy is the energy that we can see.

Kinetic energy is the energy of moving objects.