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

It will decelerate and then stop

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

It will stop moving immediately when the force is applied

2. A body is moving in a straight line under the action of a constant force. What change will occur to the body?

Change in inertia

Change in mass

Change in kinetic energy

Change in acceleration

3. What affects the stability of an object?

Only its weight and its base area

Only its weight

Only its base area and the location of its centre of mass

Only the location of its centre of mass

4. When two forces are combined, the size of the resultant depends on the angle between the two forces. Which of the following can not be the magnitude of the resultant when forces of magnitude 2 N and 5 N are combined?

2 N

7 N

3.5 N

8 N

5. 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?

430 N

350 N

840 N

600 N

6. A body on a horizontal frictionless surface is acted upon by a 5 N force towards the right, and another 5 N force towards the left. Which of the following CANNOT describe the body's motion? (i.e. which of the scenarios is IMPOSSIBLE.)

It is stationary.

It is slowing down.

It is moving to the right.

It is moving to the left.

7. Why does an object falling in the Earth's gravitational field reach a steady velocity?

The Earth's gravitational field decreases as it falls

The weight of the object increases as it falls

Air resistance increases with the increase of velocity

The mass of the object remains constant

8. Which object behaves as an elastic solid as it deforms?

A car damaged in a collision

A bullet as it hits a solid metal wall

A football as it is kicked

A piece of metal cut by a saw

9. When a force is applied to an object, several effects are possible. Which of the following effects cannot occur?

The object rotates.

The mass of the object decreases.

The object speeds up.

The pressure on the object increases.

10. Which of the following statements is correct?

When an object is moving at a constant velocity, it has a constant displacement

The inertia of an object does not depend on the mass of the object

An unbalanced force is needed to keep a body in motion

Velocity of the body must be changing when the body is accelerating uniformly

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