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IGCSE Physics1.5.2 Turning effect of forcesQuestion Bank

1.5.2 Turning effect of forces

Question 1

Question 1(a)

(a)

Fig. 1.1 shows a helicopter which is stationary at a height of 1500 m above the ground.

Fig. 1.1 (not to scale)

Fig. 1.1 (not to scale)

[ 2 ]

Question 1(a)(i)

(i)

State the two conditions necessary for the helicopter to remain in equilibrium. condition 1
condition 2

[ 2 ]

Question 2

[Maximum number: 5]

(a) (i) State, in words, the equation that defines the moment of a force.

Question 2(a)

Question 2(a)(i)

(a)
(i)

State, in words, the equation that defines the moment of a force.

[ 2 ]

Question 2(a)(ii)

(ii)

State what is meant by the moment of a force.

[ 1 ]

Question 2(b)

(b)

Fig. 2.1 shows a tower crane used to lift a load on a construction site.

Fig. 2.1

Fig. 2.1

Explain how the counterweight prevents the crane from toppling over.

[ 2 ]

Question 2

Question 2(a)

Question 2(a)(i)

(a)
(i)

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

[ 1 ]

Question 2(a)(ii)

(ii)

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 5

[Maximum number: 1]

Each diagram shows three forces on a beam.
In which situation is it possible for the three forces shown to be in equilibrium?

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C

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D

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Question 5

[Maximum number: 1]

Three simple machines are shown.

1

1

moving soil with a wheelbarrow

2

2

cutting string with scissors

3

3

screwing a screw with a screwdriver

Which machines are an application of the moment of a force?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

Question 5

[Maximum number: 1]

A 20 m long, uniform bridge of weight 100 kN is supported at each end by pillars, as shown.

Question image

The pillars exert forces T1T_{1} and T2T_{2} on the ends of the bridge.
What are the values of T1T_{1} and T2T_{2} when a van of weight 24 kN is on the bridge, 5 m from the left-hand pillar?

T1/kNT_{1} / \mathrm{kN}

T2/kNT_{2} / \mathrm{kN}

56

68

62

62

68

56

74

50

Question 5

[Maximum number: 1]

The diagram shows a uniform bar resting on two supports, P and Q.

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The weight of the bar is 4.0 N .
What is the force exerted on the bar by support P ?

A

0.80 N0.80 \mathrm{~N}

B

2.0 N2.0 \mathrm{~N}

C

3.2 N3.2 \mathrm{~N}

D

4.0 N4.0 \mathrm{~N}

Question 5

[Maximum number: 1]

A wheelbarrow has a weight W of 140 N.

Question image

Which vertical force F is needed to support the wheelbarrow in the position shown?

A

60 N

B

80 N80 \mathrm{~N}

C

140 N

D

245 N

Question 5

[Maximum number: 1]

A metal rod of length 80 cm is pivoted at point O . Its centre of mass is at its mid-point. Four pulley wheels are indicated by the letter P.

Question image

The rod is in equilibrium, as shown.
What is the weight of the rod?

A

0.20 N0.20 \mathrm{~N}

B

1.0 N1.0 \mathrm{~N}

C

2.0 N2.0 \mathrm{~N}

D

4.0 N4.0 \mathrm{~N}

Question 5

[Maximum number: 1]

The diagram shows a metre rule MN on two supports, P and Q .
Two loads are placed on the rule, as shown.

Question image

The rule rests steadily on the supports.
Which row is correct?

total moment

about M

total moment

about N

is clockwise

is anticlockwise

is clockwise

is zero

is zero

is clockwise

is zero

is zero

0 selected