Flinders Island

1
Energy is measured using a unit called the:
A kilogram.
B metre.
C second.
D joule.
2
The energy of a moving object is called:
A nuclear energy.
B gravitational potential energy.
C elastic potential energy.
D kinetic energy.
3
Jordan watches a music video clip on his iPhone. Choose the best description of the energy transformations that are happening.
A electrical energy  sound energy + light energy + heat energy
B electrical energy  sound energy + light energy
C sound energy + light energy + heat energy  electrical energy
D sound energy + light energy  electrical energy
4
A particular electric knife is 40% efficient. If 100 J of energy is supplied to the knife, the number of joules that is then transformed into kinetic energy is:
A 40
B 100
C 60
D 140
5
Select which device transforms chemical energy into kinetic energy.
A a torch
B a battery operated car
C a kettle
D an electric knife
6
Select the correct energy flow diagram showing energy changes that occur when operating a battery-operated fire truck that moves and sounds a siren.
A electrical energy  chemical energy + sound energy
B chemical energy  sound + heat energy
C electrical energy  heat + elastic potential energy
D chemical energy  kinetic energy + sound + heat
7
A red Honda travels at 20 km/h around a curved road near the top of a mountain. A blue Honda travels at 50 km/h along a flat road near a beach. a State which car has the greatest kinetic energy.

b State which car has the greatest gravitational potential energy.

c Explain your answers above.

8 a List one useful forms of energy that are produced when you use an electric drill.

b Identify two other forms of energy that are produced that are not useful.

9
The table below lists the specific thermal capabilities of a number of materials. This unit is the number of joules of energy that is needed to raise the temperature of 1 kg of this substance by 1° Celsius.

If each material listed in the table was heated with 100 kJ of energy, the material that would be the hottest after heating is:
A water
B oil
C glass
D copper
10
The higher the star rating of an appliance, the more energy efficient the appliance is. Three similarly-sized clothes dryers: X, Y and Z are tested to assess their star rating. Clothes dryer X wastes 60% of the energy put into it. Clothes Dryer Y is 20% efficient. Clothes dryer Z wastes 35% of the energy input. The three clothes dryers listed in increasing order of the number of stars that appear on the label are:
A X, Y and Z
B Z, Y and X
C Y, X and Z
D Y, Z and X