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. 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

1 only

2 and 3 only

1 and 2 only

2 only

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

The mass of the object remains constant

The weight of the object increases as it falls

Air resistance increases with the increase of velocity

The Earth's gravitational field decreases as it falls

3. in which direction does the frictional force always act on an object moving across a horizontal surface?

In the direction of motion

Opposite to the direction of motion

in the direction of the gravitational force

Opposite to the direction of the gravitational force

4. In which situation is the resultant force on the body equal to zero?

An aircraft accelerating along a runway in a straight line

A car turning a corner at constant speed

A rock falling freely on the Moon

A train going up a straight hill at constant speed in a straight line

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

A bullet as it hits a solid metal wall

A piece of metal cut by a saw

A football as it is kicked

A car damaged in a collision

6. 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?

600 N

840 N

430 N

350 N

7. A car is travelling at constant speed along a road and discovers that a thin sheet of ice has formed on the road. Fearing for his safety, the driver applies the brakes to stop the car. Compared to braking on a dry road, what may happen?

The car slows down more quickly because of the greater friction between the tyres and the road.

The car speeds up at first because of the reduced friction between the tyres and the road.

The car takes longer to slow down because of the reduced friction between the tyres and the road.

The car takes longer to slow down because the thinking distance of the driver is greater.

8. 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

8 N

7 N

3.5 N

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

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

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

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

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

10. A force is applied to a body.

Which property of the body cannot be changed by the force?

Its shape

Its size

Its velocity

Its mass

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