CAIE IGCSE Physics 1 Motion Forces and Energy Questions

Practise motion, forces and energy through measurement choices, scalar-vector decisions, speed calculations and force diagrams.

Covered syllabus points

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

[Maximum number: 1]

A student wishes to find the volume of a small, irregularly shaped stone.

Figure for Question 1 — CAIE IGCSE Physics

A ruler and a measuring cylinder containing some water are available.
Which apparatus is needed?

neither the ruler nor the measuring cylinder

the measuring cylinder only

the ruler and the measuring cylinder

the ruler only

[Maximum number: 9]

Fig. 1.1 shows a straight section of a river where the water is flowing from right to left at a speed of $0.54 \mathrm{~m} / \mathrm{s}$ .

Fig. 1.1 (not to scale)

A swimmer starts at point P and swims at a constant speed of $0.72 \mathrm{~m} / \mathrm{s}$ relative to the water and at right angles to the current.

(a)

Determine, relative to the river bank, both the magnitude and direction of the swimmer's velocity.

magnitude of velocity =

direction of velocity

[ 4 ]

(magnitude of velocity =) $0.90 \mathrm{~m} / \mathrm{s}$
use of Pythagoras' theorem e.g. $a^{2}+b^{2}=c^{2} \mathrm{OR}($ speed $=) \sqrt{ }\left(0.54^{2}+0.72^{2}\right)$

OR

correct vector triangle or rectangle drawn
(direction of velocity = ) $53^{\circ}$ (to riverbank)
use of trigonometry to find angle e.g. $\tan \theta=0.72 / 0.54$

OR

(only) angle with horizontal identified on the diagram

(b)

After 1.5 minutes, the swimmer reaches point Q.

Calculate the distance between P and Q.
distance =

[ 3 ]

(distance $=) 81 \mathrm{~m}$ $v=s / t \mathbf{O R}(s=) v t \mathbf{O R}(s=) 0.9(0) \times 90$
(time =) $1.5 \times 60(=90)$ OR (time =) 90

(c)

When the swimmer is crossing the river, his actions produce a constant forward force on his body.

Explain why he moves at a constant speed.
[Total: 9]

[ 2 ]

[Maximum number: 7]

In a double-decker bus there are two passenger compartments, one above the other.

(a)

Fig. 3.1 shows a double-decker bus on a tilted platform.

Fig. 3.1

The platform is used to test the stability of the bus.
The angle the bus makes with the horizontal is gradually increased until the bus begins to topple to the left.

Explain why the bus begins to topple.

[ 1 ]

(b)

There are 30 passengers in the upper compartment of the bus and 2 passengers in the bottom compartment of the bus.

State how this affects the stability of the bus and the reason for this.

[ 2 ]

(c)

A bus is travelling along a straight road. The bus and the driver have a combined mass of 16000 kg when there are no passengers in it. The bus has 73 passengers. The average mass of each of the passengers is 65 kg .

[ 4 ]

(i)

Calculate the total mass of the bus, the driver and the 73 passengers.

mass =

[ 2 ]

total mass of passengers $=73 \times 65(\mathrm{~kg})$ OR 4700 kg
(total mass of bus, driver and 73 passengers) $=21000 \mathrm{~kg}$

(ii)

The fully loaded bus accelerates uniformly from rest to a speed of $14 \mathrm{~m} / \mathrm{s}$ . The time taken to reach a speed of $14 \mathrm{~m} / \mathrm{s}$ is 20 s .

Calculate the resultant force on the bus during the acceleration.

force =

[Total: 7]

[ 2 ]

[Maximum number: 1]

The diagram shows some liquid in a measuring cylinder.
The mass of the liquid is 16 g .

Figure for Question 4 — CAIE IGCSE Physics

What is the density of the liquid?

$0.80 \mathrm{~g} / \mathrm{cm}^{3}$

$1.3 \mathrm{~g} / \mathrm{cm}^{3}$

$36 \mathrm{~g} / \mathrm{cm}^{3}$

$320 \mathrm{~g} / \mathrm{cm}^{3}$

All question bank results loaded

Covered syllabus points

Question 1

Question 2

Question (a)

Question (b)

Question (c)

Question 3

Question (a)

Question (b)

Question (c)

Question (i)

Question (ii)

Question 4