CAIE IGCSE Physics 1.5.1 Effects of Forces Topic Practice

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Covered syllabus points

1.5.1.1—Forces may produce changes in the size1.5.1.2—Load–extension graphs for an elastic1.5.1.3—Resultant of two or more forces acting1.5.1.4—An object either remains at rest or1.5.1.5—A resultant force may change the1.5.1.6—Solid friction as the force between1.5.1.7—Friction (drag) acts on an object1.5.1.8—Friction (drag) acts on an object1.5.1.9—Spring constant as force per unit1.5.1.10—Term ‘limit of proportionality’ for a1.5.1.11—Recall/use: F = ma1.5.1.12—Circular motion caused by a force

Question 1

[Maximum number: 7]

Question (a)

(a)

State two properties of an object that may be changed by the action of forces.
1.
2.

[ 2 ]

Question (b)

(b)

A chest expander is a piece of equipment used by athletes in a gym. Fig. 2.1 shows a chest expander that consists of five identical springs connected in parallel between two handles.

Fig. 2.1

Fig. 2.1

Each spring has an unstretched length of 0.63 m .
Two athletes are stretching the chest expander by pulling on the two handles in opposite directions.

[ 5 ]

Question (i)

(i)

The springs obey Hooke's law.

Explain what is meant by this statement.

[ 2 ]

Question (ii)

(ii)

Each athlete pulls the handle towards himself with a force of 1300 N .
1. State the tension in each spring.

tension =.........................................................

2. The chest expander stretches and each spring is now 0.94 m long.

Calculate the spring constant k of each spring.

k=
[ 3 ]

Question 2

[Maximum number: 6]

A force is a vector quantity.

Question (a)

(a)

A student suspends a spring from a clamp stand and measures the length l0l_{0} of the spring.

Fig. 2.1 shows the apparatus.

Fig. 2.1 (not to scale)

Fig. 2.1 (not to scale)

The student then suspends loads of different weights from the spring and measures the length of the spring for each load. He then plots a graph of the length of the spring against weight.

Fig. 2.2 is the graph that the student plots.

Fig. 2.2

Fig. 2.2

[ 6 ]

Question (i)

(i)

Using Fig. 2.2, determine the initial length l0l_{0} of the spring.

l0=l_{0}=
[ 1 ]

Question (ii)

(ii)

State what is meant by the limit of proportionality and, using Fig. 2.2, determine the weight of the load that causes this spring just to reach the limit of proportionality.
limit of proportionality
weight =

[ 2 ]

Question (iii)

(iii)

Using Fig. 2.2, determine the spring constant of this spring.
spring constant =

[ 3 ]

Question 3

[Maximum number: 3]

Question (a)

(a)

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

[ 3 ]

Question (i)

(i)

State whether the balloon rises, falls or remains stationary.

[ 1 ]

Question (ii)

(ii)

Explain your answer.

[ 2 ]
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