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WorksheetsTurning Effect and Equilibrium
Total questions: 15
Worksheet time: 18mins
The moment of a force causes an object to
move forward
move backward
stop moving
turn about a fixed point
The turning effect of a force on a door is greater when it is applied at
A point near the hinges and perpendicular to the door
A point near the hinges and parallel to the door
A point far away from the hinges and perpendicular to the door
A point far away from the hinges and parallel to the door
Two equal and oppositely directed forces acting on an object will be in equilibrium
Only if they act on the same point on the object
If they are separated by a distance
When they are balanced by a third force
when their moments about the same point are equal
The diagram shows a light beam pivoted at one end. What is the effort required to lift the load?
50
67
100
200
Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?
Jack
Jill
Both of them
None of them
A nut can be loosen more easily with
A short spanner because a large turning effect can be produced
A short spanner because a larger force can be produced.
A heavy spanner because a larger force can be produced.
long spanner because a large turning effect can be produced.
The diagram shows a gauge which measures the amount of liquid in a tank. At which position should the pivot be placed so that the pointer moves the greatest distance as the tank is emptied?
A
B
C
D
What is the force F needed to balance the bar shown?
3
4
6
8
A light metre rule is allowed to pivot freely at the zero end. The other end is supported by a spring balance. A weight of 200N is then hung at the 40cm mark. The metre rule stays horizontal. What is the reading on the spring balance?
80
40
8
4
Which one of the following activities does not apply the turning effect of a force?
swinging on a swing
sliding down a slide
moving up and down on the see-saw
rowing a boat
Which one of the following quantities is zero when a uniform rod is supported in the middle?
mass
weight
pressure
moment
A nut has been tightened by a force of 180 N using 8 cm long spanner. What length of a spanner is required to loosen the same nut with 150 N force
11 cm
8.5 cm
9.6 cm
10.9 cm
A force of 120 N is applied perpendicularly on a spanner at a distance of 9 cm from a nut. The torque produced by the force will be
12 Nm
10.8 Nm
15 Nm
12.59 Nm
A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?
450 N
350 N
4.5 N
200 N
The figure shows a uniform metre rule pivoted at the 50cm mark. 125g and 200g weights hang from the rule as shown. Calculate where you would hang a 25g mass in order to balance the rule horizontally
20 cm from pivot on the side of 125 g mass
10 cm from pivot on the side of 125 g mass
40 cm from pivot on the side of 200 g mass
10 cm from pivot on the side of 200 g mass
