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 1.5.1 Effects of forces Question Bank

(a)

A 20 N force and a 15 N force act at the same time on an object of mass 14 kg .

Calculate

[ 3 ]

(i)

the maximum possible force on the object due to these two forces,
force =

[ 1 ]

(ii)

the acceleration caused by a resultant force equal to this maximum force.
acceleration =

[ 2 ]

[Maximum number: 3]

A skydiver of mass 76 kg is falling vertically in still air. At time t=0, the skydiver opens his parachute.

Fig. 1.1 is the speed-time graph for the skydiver from t=0.

Fig. 1.1

(a)

Using Fig. 1.1, determine:

[ 3 ]

(i)

the force due to air resistance acting on the skydiver immediately after the parachute opens.
force =

[ 3 ]

(a)

At night, the gas inside the balloon cools. The pressure of the air outside the balloon remains the same.

[ 3 ]

(i)

State whether the balloon rises, falls or remains stationary.

[ 1 ]

(ii)

Explain your answer.

[ 2 ]

(a)

A plane is at rest on an airport runway. The brakes of the plane are released and the engine of the plane provides a constant accelerating force.

Using the following data, calculate the take-off speed of the plane. Ignore any resistive forces. constant forward force $=56000 \mathrm{~N}$
mass of plane $=16000 \mathrm{~kg}$
time of travel along runway $=16 \mathrm{~s}$
speed =
[Total: 8]

[Maximum number: 6]

Fig. 1.1 shows a load suspended from a spring.

Fig. 1.1

The value of the spring constant k of the spring is $0.20 \mathrm{~N} / \mathrm{cm}$ . The spring reaches its limit of proportionality when the load is 15 N.

(a)

Calculate the extension of the spring when the load is 3.0 N .
extension =

[ 2 ]

(b)

Explain what is meant by the term limit of proportionality of the spring.

[ 2 ]

(c)

On Fig. 1.2, sketch an extension-load graph for a spring. Label the limit of proportionality with the letter L on your graph.

Fig. 1.2

[ 2 ]

(a)

An object is moving in a straight line at constant speed. A force is applied to the object. State the possible changes in the motion of the object.

[ 2 ]

(b)

Fig. 1.1 shows a skier taking part in a speed competition. The winner of the competition has the highest average speed over the 100 m section shown in Fig. 1.1.

Fig. 1.1

[ 2 ]

(i)

Suggest why the skier bends his body, as shown in Fig. 1.1.

Explain your answer.

[ 2 ]

[Maximum number: 2]

A driving instructor gives a student a sudden order to stop the car in the shortest possible time.
Fig. 1.1 shows the speed-time graph of the motion of the car from the moment the order is given.

Fig. 1.1

(a)

Describe and explain a danger to a driver of not wearing a safety belt during a sudden stop.
[Total: 9]

[ 2 ]

[Maximum number: 3]

A ship sails in a straight line between two ports.
Fig. 1.1 shows the speed-time graph of the ship for the first 100 minutes of its journey between the two ports.

Fig. 1.1

(a)

At a time not shown on the graph, the acceleration of the ship is $0.0087 \mathrm{~m} / \mathrm{s}^{2}$ . The total mass of the ship and its passengers is $2.3 \times 10^{7} \mathrm{~kg}$ .

[ 3 ]

(i)

Calculate the resultant force on the ship.
force =

[ 2 ]

(ii)

Explain why the force on the ship due to the ship's engine is greater than the value you calculated in (c)(i).

[ 1 ]

[Maximum number: 1]

Fig. 1.1 is the speed-time graph for an ice skater.

Fig. 1.1

(a)

(i)

State what happens to the resultant force on the skater after time $t=6.0 \mathrm{~s}$ .

[ 1 ]

[Maximum number: 2]

Some physical quantities are scalars and other physical quantities are vectors.

(a)

A microphone in a recording studio has a mass of 0.55 kg and a weight W.

[ 2 ]

(i)

State and explain how the magnitude and direction of the resultant in (c)(ii) compares with the force on the ring due to the tension in the cord.

[ 2 ]

0 selected

Question 1

Question 1(b)

Question 1(b)(i)

Question 1(b)(ii)

Question 1

Question 1(a)

Question 1(a)(ii)

Question 1

Question 1(b)

Question 1(b)(i)

Question 1(b)(ii)

Question 1

Question 1(c)

Question 1

Question 1(a)

Question 1(b)

Question 1(c)

Question 1

Question 1(a)

Question 1(b)

Question 1(b)(iii)

Question 1

Question 1(c)

Question 1

Question 1(c)

Question 1(c)(i)

Question 1(c)(ii)

Question 1

Question 1(c)

Question 1(c)(ii)

Question 1

Question 1(c)

Question 1(c)(iii)