1. Motion, forces and energy

1.1 Physical quantities and measurement techniques

1.2 Motion

1.3 Mass and weight

1.4 Density

1.5.1 Effects of forces

1.5.2 Turning effect of forces

1.5.3 Centre of gravity

1.6 Momentum

1.7.1 Energy

1.7.2 Work

1.7.3 Energy resources

1.7.4 Power

1.8 Pressure

2. Thermal physics

2.1.1 States of matter

2.1.2 Particle model

2.1.3 Gases and the absolute scale of temperature

2.2.1 Thermal expansion of solids, liquids and gases

2.2.2 Specific heat capacity

2.2.3 Melting, boiling and evaporation

2.3.1 Conduction

2.3.2 Convection

2.3.3 Radiation

2.3.4 Consequences of thermal energy transfer

3. Waves

3.1 General properties of waves

3.2.1 Reflection of light

3.2.2 Refraction of light

3.2.3 Thin lenses

3.2.4 Dispersion of light

3.3 Electromagnetic spectrum

3.4 Sound

4. Electricity and magnetism

4.1 Simple phenomena of magnetism

4.2.1 Electric charge

4.2.2 Electric current

4.2.3 Electromotive force and potential difference

4.2.4 Resistance

4.2.5 Electrical energy and electrical power

4.3.1 Circuit diagrams and circuit components

4.3.2 Series and parallel circuits

4.3.3 Action and use of circuit components

4.4 Electrical safety

4.5.1 Electromagnetic induction

4.5.2 The a.c. generator

4.5.3 Magnetic effect of a current

4.5.4 Force on a current-carrying conductor

4.5.5 The d.c. motor

4.5.6 The transformer

5. Nuclear physics

5.1.1 The atom

5.1.2 The nucleus

5.2.1 Detection of radioactivity

5.2.2 The three types of nuclear emission

5.2.3 Radioactive decay

5.2.4 Half-life

5.2.5 Safety precautions

6. Space physics

6.1.1 The Earth

6.1.2 The Solar System

6.2.1 The Sun as a star

6.2.2 Stars

6.2.3 The Universe

IGCSE Physics 1.7.2 Work Question Bank

[Maximum number: 4]

A car accelerates uniformly in a straight line from rest at time t=0. At $t=3.2 \mathrm{~s}$ , the speed of the car is $13.0 \mathrm{~m} / \mathrm{s}$ .

(a)

The car decelerates from $13.0 \mathrm{~m} / \mathrm{s}$ to $0 \mathrm{~m} / \mathrm{s}$ at a constant deceleration. The mass of the car is 1350 kg . The car travels 13 m in 2.0 s as it decelerates.

Show that the work done by the car as it decelerates is approximately $1.1 \times 10^{5} \mathrm{~J}$ .

[ 4 ]

[Maximum number: 2]

Fig. 2.1 is the top view of a small ship of mass $1.2 \times 10^{6} \mathrm{~kg}$ . The ship is moving slowly sideways at $0.040 \mathrm{~m} / \mathrm{s}$ as it comes in to dock.

Fig. 2.1

The ship hits the wooden pillars which move towards the dock wall.

(a)

Assume that the kinetic energy calculated in (a) is used to do work moving the pillars. Calculate the distance moved by the pillars.
distance =

[ 2 ]

[Maximum number: 3]

Fig. 2.1 shows a wooden trolley of mass 1.2 kg at rest on the rough surface of a bench.

Fig. 2.1

A ball of mass 0.52 g travels horizontally towards the trolley. The ball embeds itself in the wood of the trolley. The trolley moves with an initial speed of $0.065 \mathrm{~m} / \mathrm{s}$ .

(a)

As the trolley moves across the rough surface, it slows down and stops.

Explain, in terms of the work done, the energy change that takes place as the trolley slows down.

[ 3 ]

[Maximum number: 1]

An object has kinetic energy of 200 J .
A constant resultant force of 190 N is applied in the direction of its motion through a distance of 10 m .

What is the final kinetic energy of the object?

390 J

1700J

2000J

2100J

[Maximum number: 1]

A skier is pulled up a short straight slope at constant speed by a rope.

The tension in the rope is 100 N and there is a combined frictional and air resistance force of 20 N acting on the skier.

The slope is 10 m long and the skier rises 1.5 m vertically.
How much work is done by the rope pulling the skier up the slope?

120 J

150J

1000J

1200J

[Maximum number: 1]

A boy uses a rope to pull an object of mass m up a slope.
The rope is parallel to the slope.
The tension in the rope is constant and of value F.
The object moves a distance d along the slope and rises through a height h.
How much work is done by the boy?

$F \times d$

$F \times h$

$m \times g \times h \times d$

$m \times g \times h^{2}$

[Maximum number: 1]

A box of mass m slides down a slope of length l against a frictional force F. It descends a vertical height d.

As the box slides down the slope, it loses gravitational potential energy and it does work against the friction.

Which row gives the loss in gravitational potential energy and the work done against friction?

loss in gravitational
potential energy

work done
against friction

m g d

mgl

F d

[Maximum number: 1]

Which situation involves no work being done and no energy being transferred?

a car skidding to a stop on a road

a crane lifting a load

a heavy load hanging from a strong bar

a student dragging a big box over a rough floor

[Maximum number: 1]

The diagrams show four bodies moving in the directions shown. The only forces acting on the bodies are shown in each diagram.

Which body gains the most kinetic energy when moving a distance of 1.0 m ?

[Maximum number: 1]

In some situations, a force does work.
Which set of conditions increases the quantity of work done by the force?

magnitude

of force

distance moved

by the force

decreases

stays the same

increases

stays the same

decreases

0 selected

Question 1

Question 1(c)

Question 2

Question 2(c)

Question 2

Question 2(b)

Question 9

Question 9

Question 9

Question 9

Question 9

Question 9

Question 10