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WorksheetsG9 IGCSE Energy, Work & Power Quiz
Total questions: 27
Worksheet time: 14mins
A steel ball is fired vertically upwards with a velocity v. The ball reaches a height h.
The same ball is now fired vertically upwards from the same position with a velocity 2v.
Air resistance can be ignored.
What is the new height reached by the ball?
h
2h
4h
8h
A solar panel is used to recharge a battery. The solar panel produces 0.80 W of electrical power.
The panel is 20% efficient.
What is the power input of the sunlight onto the solar panel?
0.16 W
4.0 W
8.0 W
16 W
The diagrams show four different athletes training by doing pull-ups.
Which athlete does the most work?
A motor is used to lift a load of 40 N.
The power of the motor is 40 W and the system is 20% efficient.
How long does it take the motor to lift the load through 0.50 m?
0.50 s
2.5 s
5.0 s
25 s
A student runs up a flight of stairs.
Which information is not needed to calculate the rate at which the student is doing work against gravity?
the height of the flight of stairs
the length of the flight of stairs
the time taken to run up the stairs
the weight of the student
The diagrams show athletes training by stretching springs.
Each spring has the same stiffness.
Which athlete does the most work?
An electric generator produces an electromotive force (e.m.f.) of 200 V and produces a current of 3.0 A in a circuit.
The generator is driven by an engine with a power of 2.4 kW.
What is the efficiency of the generator?
2.8%
25%
28%
36%
Different processes have different efficiencies.
Which row shows the most efficient process?
A
B
C
D
A 150 W filament lamp has an efficiency of 10%. A 40 W compact fluorescent lamp (CFL) has an
efficiency of 30%.
Each lamp is switched on for the same amount of time.
Which lamp produces more light and which lamp converts more energy into other forms of
energy
A
B
C
D
A lamp has a power input of 5.0 W. It wastes 1.0 W of power heating the surroundings.
What is the efficiency of the lamp?
20%
50%
80%
120%
The box contains the names of eight different energy resources.
How many of these energy resources are renewable?
3
4
5
6
A car of mass 800 kg travels over a hill of height h.
By travelling to the top of the hill, the car gains 40000 J of gravitational potential energy.
The gravitational field strength g is 10 N /kg.
What is the height h of the hill?
5.0 m
20 m
50 m
500 m
A pendulum bob swings along the path WXYZ and back again. Resistive forces can be ignored.
Which statement describes the total energy of the bob?
It has a maximum value at X.
It has a maximum value at Y
It has a maximum value at Z
It has the same value at W, X, Y and Z
An athlete runs 300 metres up a hill at a steady speed of 3.0 m/s.
She then immediately runs the same distance down the hill at a steady speed of 6.0 m / s.
What is her average speed for the 600 metre run?
2.0 m/s
3.0 m/s
4.0 m/s
4.5 m/s
Which statement is correct?
Mass is a gravitational force but weight is not a gravitational force.
Mass is not a gravitational force and weight is not a gravitational force.
The unit of mass is the kilogram and the unit of weight is the newton.
The unit of mass is the newton and the unit of weight is the kilogram.
The diagram shows a bird in flight. The bird is flying in a horizontal direction to the right.
In which direction does air resistance act on the bird?
A
B
C
D
A car is travelling along a straight horizontal road. The speed-time graph is shown.
In which labelled part of the journey is the resultant force on the car zero?
A
B
C
D
The diagram shows a uniform metre rule balanced at its mid-point.
What is the weight W placed at the 20 cm mark?
0.25 N
4.0 N
9.0 N
21 N
A wooden plank rests in equilibrium on two rocks on opposite sides of a narrow stream.
Three forces P, Q and R act on the plank.
How are the sizes of the forces related?
P + Q = R
P + R = Q
P = Q = R
P = Q + R
A ball is at rest at the top of a hill. It rolls down the hill. At the bottom of the hill the ball hits a wall and stops.
Which energy changes occur?
gravitational potential energy → internal energy → kinetic energy
gravitational potential energy → kinetic energy → internal energy
kinetic energy → gravitational potential energy → internal energy
kinetic energy → internal energy → gravitational potential energy
A man pulls a truck a distance of 20 m, as shown in the three diagrams.
Which statement concerning the work done against gravity is correct?
Most work is done in 1.
No work is done in 3.
The work done in all three is equal.
The work done in 1 and 2 is equal.
Two beakers are filled to the same depth, one with water and one with oil.
The density of water is 1000 kg/m3 and the density of oil is 920 kg/m3.
In which position is the pressure the greatest?
A
B
C
D
A water manometer is connected to a gas supply.
There is a gas leak and the pressure of the gas supply falls.
What happens to the water level at P and what happens to the water level at Q?
water level at P falls; water level at Q falls.
water level at P falls; water level at Q rises.
water level at P rises; water level at Q falls.
water level at P rises; water level at Q rises.
A cylinder with a tap contains a fixed mass of gas X. The gas is contained by a piston which can move freely towards or away from the tap.
When the tap is opened, the piston moves slightly to the right, towards the tap.
What can be deduced about the pressure of gas X?
before opening tap - less than atmospheric pressure; after opening tap - more than atmospheric pressure.
before opening tap - same as atmospheric pressure; after opening tap - more than atmospheric pressure.
before opening tap - more than atmospheric pressure; after opening tap - less than atmospheric pressure.
before opening tap - more than atmospheric pressure; after opening tap - same as atmospheric pressure.
A skier walks from the bottom of a ski slope to the top and gains 10 000 J of gravitational potential energy.
She skis down the slope. At the bottom of the slope, her kinetic energy is 2000 J.
How much energy is dissipated in overcoming friction and air resistance as the skier moves down the slope?
2 000 J
8 000 J
10 000 J
12 000 J
Four different children run up the same set of stairs. For which child is the useful power to climb the stairs the greatest?
mass of child = 40 kg; time taken = 15 s.
mass of child = 50 kg; time taken = 25 s.
mass of child = 60 kg; time taken = 25 s.
mass of child = 70 kg; time taken = 15 s.
Which energy source is one that is used to boil water to make steam in power stations?
energy from tides
energy from waves
hydroelectric energy
nuclear energy
