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# Turning Effect of a Force Questions and Answers and Answers

In this session, we are going to solve turning effect of a force questions. The topic is Form 2 Physics work. Answers are available in video format.

Lessons (**35**)

- 1.
State what would happen tothe wheel if the string snapped.

1m 49s - 2.
The moment of the weight of vertical door does not significantly affect the moment of the force required to open the door.
Give a reason for this.

2m 29s - 3.
Determine the moment of the couple named in question 6.

3m 50s - 4.
Figure 8 shows a uniform wooden block of mass 2kg and length 25cm lying on a bench. It hangs over the
edge of the bench by 10cm. Use the figure to answer questions 10 and 11.Indicate on the figure two forces acting on the wooden block.

2m 39s - 5.
State one factor that affects the turning effect of a force on a body.

2m 53s - 6.
Fig. 2 shows a rigid body acted upon by a set of forces. The magnitudes of the forces are as follows:# F_1 = 3N, F_2 = 6N, F_3 = 3N,
F_4 = 4N, F_5 = 3N AND F_6 = 3N.#
Identify the couple among these forces.

3m 19s - 7.
Determine the moment of the couple shown in figure 10.

2m 4s - 8.
Figure 9 shows a uniform light bar one meter in length in equilibrium under the action of forces# F_1, F_2, F_3 and F_4#. All the forces are in the same plane. Use the information on the figure to answer questions 7 and 8.
Name one set of forces on the figure that constitutes a couple.

4m 45s - 9.
Figure 9 shows a uniform bar in equilibrium under the action of two forces.
Determine the value of F.

4m 42s - 10.
Figure 4 shows a uniform metre rule of weight I N with two weights of 0.18 N and 0.12 N suspended from its ends.
Determine how far from the 0.18 N weight, a pivot should be placed in order to balance the metre rule.

9m 16s - 11.
Figure 5 shows a uniform rod 4m and of mass 2kg. it is pivoted 1m from one end and balanced horizontally by
a string attached near the other end. Determine the position where a mass of 5kg should be placed on the rod so that the rod remains horizontal
and the tension in the string is zero.

4m 16s - 12.
Figure 4 shows a uniform metal rod balanced at its centre by different forces.
Determine the value of T.

5m 13s - 13.
A uniform metre rule is pivoted at its centre. Two weights of 20N and 10N are suspended at the 20cm and 100cm marks respectively.
Determine the position at which a 10N weight should be suspended in order to balance the system.

5m 50s - 14.
Figure 4 shows a one metre long uniform rod of negligible weight supporting two weights.
Determine the position of the fulcrum from 0 cm for the rod to remain in equilibrium.

4m 51s - 15.
The diagram in Fig. 5 shows a beam of negligible weight balanced by constant forces P and Q Derive the relationship between x and y.

5m 28s - 16.
Fig. 5 shows a wheel W pivoted at its centre, O and held stationary by a string and a spring. The tension in the string is T and the force on the springs is F. use this information to answer questions 2 and 3. State how the magnitudes of T and F compare. Give reasons for your answer.

4m 31s - 17.
A wooden plant of negligible weight and 80cm long is supported by a knife edge at P. Weights of 2N, 4N and F act as shown. Calculate the value of F

2m 41s - 18.
A stick of negligible weight is kept in a horizontal position by the force shown in the diagram below. Calculate the value of y and the magnitude of force Q.

2m 0s - 19.
The figure below shows a uniform metre rule pivoted at its 30 cm mark. Given M = 200g and the system is in equilibrium. Find the weight of the rule.

2m 29s - 20.
A uniform plank of length 5m and weight 250N acted upon by two forces as shown below .Calculate the tension force T that will keep the plank balanced horizontally.

1m 57s - 21.
The figure below shows a uniform meter rule balanced at the 30 cm mark when a mass of 50g is hanging from its zero cm mark. Calculate the weight of the rule

2m 10s - 22.
The figure below shows a uniform meter rule pivoted at 30cm mark. It is balanced by a weight of 2N suspended at the 5cm mark. Determine the weight of the meter rule.

2m 10s - 23.
The following diagram shows a long thin metal bar made of two parts connected at the ends with an insulating material. Side A is brightly polished while B is painted black. Two masses of equal weight are suspended on the ends. The bar is in equilibrium as shown in the diagram below. State and explain what will be observed on the equilibrium of the bar if it is placed outside on a hot day.

1m 6s - 24.
The figure below shows a rod made of wood on one end and metal on the other end suspended freely with a piece of thread so that it is in equilibrium. The side made of metal is heated with a Bunsen burner flame. State with a reason, the side to which the rod is likely to tilt.

1m 9s - 25.
The figure below shows a system in equilibrium. Determine the force, F needed to maintain the equilibrium. (Ignore the weight of the beam)

2m 21s - 26.
The figure below shows a uniform rod of length 4m and pivoted at 3.6m mark. The rod is held horizontally with a
vertical rope at 4m mark as shown. If the tension in the rope is 160N, determine the weight of the rod.

1m 42s - 27.
The figure below shows a uniform bar pivoted at its centre and is at equilibrium. Determine the value of w.

2m 0s - 28.
The figure below shows a uniform bar which weighs 16 N supported by a spring balance at its center. If the system is at equilibrium,
a) Determine the value of this force A.
b).Determine the reading of the spring balance.

1m 32s - 29.
The figure below shows a uniform metre rule pivoted at the 70cm mark. It is balanced by a weight of 2N suspended at the 95cm mark. Determine the weight of the metre rule

1m 32s - 30.
The figure below shows a uniform metre rule of weight 1N with two weights of 0.18N and 0.12N suspended from its ends. Determine how far from the 0.18N weight a pivot should be placed in order to balance the metre rule.

3m 22s - 31.
The figure below shows uniform bar of length 1.4m pivoted near end. The bar is kept in equilibrium by a string as shown. Given that the weight of the bar is 1.5N, determine the tension in the string.

2m 43s - 32.
A uniform metre rule of mass 95g is balanced on a pivot when a mass of 5g is hung from the 10cm mark. Find the position of the pivot

3m 45s - 33.
A uniform metre rule pivoted at the 60cm mark is kept horizontally by placing a 50g mass on the 80cm mark. Calculate the mass of the metre rule.

2m 36s - 34.
The diagram shows a uniform half-metre rule balanced at its midpoint. What is the weight of the metal block?

1m 28s - 35.
The diagram shows a force being applied to a lever to lift a heavy weight. Which change would enable the heavy weight to be lifted with a smaller force?

0m 33s