Practice MCQs For Force and Turning Effect Of Forces

This quiz contains practice questions for GCE ‘O’ level topic: Forces and Turning effect of forces. There are explanations for some of the questions after you submit the quiz. If you could not figure out why a particular option is the answer, feel free to drop a comment below or ask a question in ‘O’ & ‘A’ Level Discussion section of the forum. If you wish to contribute questions to this quiz, please contact us.

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1. An object of mass 2 kg is pushed along a horizontal flat surface. The friction force is measured to be 4 N. When the same object is pushed along the same surface with a force of 10 N, it moves with a constant

speed of 3 m/s

acceleration of $ 5 \: m/ s^{2} $

speed of 5 m/s

acceleration of $ 3 \: m/ s^{2} $

2. An object is moving in a straight line on a smooth surface at 6 m/s when a constant force acts on it from the opposite direction. If the force is held constant for a long time, how long will the object move?

It will stop moving immediately when the force is applied

It will decelerate, stop and then move in the opposite direction with a constant speed

It will decelerate, stop and then move in the opposite direction with a constant acceleration

It will decelerate and then stop

3. The graph shows how the length of the spring varies with the load. A load is hung on the spring, which causes the spring to extend by 4 cm. What is the balance reading?

 

10 N

15 N

20 N

5 N

4. When a resultant force of 6.0 N is applied to a mass of 3.0 kg, the acceleration of the mass will be ___________.

$3.0 \text{ m s}^{-2}$

$2.0 \text{ m s}^{-2}$

$18.0 \text{ m s}^{-2}$

$0.5 \text{ m s}^{-2}$

5. A rod is balanced horizontally with several weights placed on it. How does its moment at the right end of the rod compare with its moment about its centre of gravity?

Moment at right end is greater than at C.G.

Cannot be determined without further information.

Moment at right end is same as at C.G.

Moment at right end is less than at C.G.

6. Which diagram correctly shows the addition of a 4 N and a 3 N force?

C

A

D

B

7. A spaceship is travelling in space in a straight line with its engine switched off. Which of the following cases would require the engine to be switch on again?

1. Keep at a constant speed in a straight line
2. Change direction
3. Slow down to a stop

2 and 3 only

2 only

1 only

1 and 2 only

8. There are two forces acting on a car: drag force and the driving force provided by the engine. When the force provided by the engine is equal to the drag force,

The car is moving at a constant acceleration

The car is stopping

The car is moving at a non-uniform velocity

The car is moving at a constant velocity

9. A 3 N force is to be added to a 8 N force. Which of the following CANNOT be the magnitude of the resultant force?

8 N

5 N

10 N

3 N

10. A load is to be moved using a wheelbarrow. The total mass of the load and wheelbarrow is 60 kg. The gravitational field strength is 10 N/kg.

What is the size of force F needed just to lift the loaded wheelbarrow?

840 N

430 N

600 N

350 N

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