CAIE IGCSE Physics 1.5.2 Turning Effect of Forces Topic Practice

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Covered syllabus points

1.5.2.1—Moment of a force as a measure of its1.5.2.2—Moment of a force as moment = force ×1.5.2.3—Apply the principle of moments to1.5.2.4—That, when there is no resultant force1.5.2.5—Apply the principle of moments to1.5.2.6—An experiment to demonstrate that

Question 1

[Maximum number: 3]

Question (a)

(a)

State what is meant by the moment of a force about a point.

[ 1 ]

Question (b)

(b)

Fig. 2.1 shows a large crane on a construction site lifting a block of mass 14000 kg .

Fig. 2.1

Fig. 2.1

Calculate the moment about A due to the 14000 kg block suspended from B.

moment =
[ 2 ]

Question 2

[Maximum number: 3]

A radio transmitter is a very tall, thin cylinder. It is prevented from falling over by wires which have one end fixed to the transmitter and the other end fixed in the ground. The ends of the wires in the ground are a long distance from the transmitter.

Fig. 4.1 shows the transmitter and two of the wires.

Fig. 4.1

Fig. 4.1

Wire W is under tension and it exerts a force T on the transmitter.

The force T produces a moment on the transmitter about its base.

Describe how the moment produced by T is calculated and indicate on Fig. 4.1 what is meant by any other terms in the description.

Question 3

[Maximum number: 4]

Fig. 3.1 shows two children balanced on a seesaw. A seesaw is a length of wood which rotates about a central pivot.

Fig. 3.1

Fig. 3.1

Question (a)

(a)

Child B moves 0.050 m further away from the pivot.

[ 4 ]

Question (i)

(i)

Explain why the seesaw rotates clockwise.

[ 1 ]

Question (ii)

(ii)

Child A puts on a backpack and the seesaw now balances.

Calculate the mass of the backpack.
mass = kg [3]

[ 3 ]
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