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 girl uses paper clips to balance a toy bird on her finger as shown.

What is the effect of the paper clips?

They help to lower the centre of mass below her finger.

They do not affect the centre of mass but increase the weight.

They help to raise the centre of mass to her finger.

They help to raise the centre of mass above her finger.

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

The mass of the object decreases.

The object rotates.

The object speeds up.

The pressure on the object increases.

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

C

B

D

A

4. 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?

 

20 N

5 N

10 N

15 N

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

An aircraft accelerating along a runway in a straight line

A rock falling freely on the Moon

A car turning a corner at constant speed

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

6. When a body moves across a rough surface, a frictional force is produced.

Which statement about this force is always true?

It acts in the direction of motion.

It makes the body recoil in the opposite direction after stopping it.

It is equal in value to the force producing the motion.

It opposes the motion across the surface.

7. When t = 0, a constant horizontal force is applied to a body initially at rest on a smooth horizontal table.. Which of the following quantities will not change during the time period t > 0?

The displacement of the body

The acceleration of the body

The velocity of the body

The kinetic energy of the body

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 piece of metal cut by a saw

A football as it is kicked

9. If a nut and bolt are difficult to undo, it may be easier to turn the nut by using a longer spanner. This is because the longer spanner gives

more power

a larger turning moment

more energy

more force

10. 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 non-uniform velocity

The car is stopping

The car is moving at a constant acceleration

The car is moving at a constant velocity

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