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 car is designed to be stable.

To achieve good stability, where is the centre of mass of the car?

As low in the car as possible

Above the front wheels

As high in the car as possible

Above the rear wheels

2. 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

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

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

speed of 5 m/s

speed of 3 m/s

3. 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?

8 N

2 N

7 N

3.5 N

4. 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 opposes the motion across the surface.

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

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

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?

600 N

430 N

350 N

840 N

6. What affects the stability of an object?

Only its weight and its base area

Only its weight

Only the location of its centre of mass

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

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

A car damaged in a collision

A football as it is kicked

A piece of metal cut by a saw

A bullet as it hits a solid metal wall

8. Which of the following statements is correct?

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

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

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

9. Which is a statement of Newton's third law of motion?

There is no acceleration if there is no resultant force on an object.

Every force causes a reaction.

The forces acting on a body are always equal and opposite.

To every action there is an equal but opposite reaction.

10.

 

What is the resultant force?

Magnitude: 15N Direction: XZ

Magnitude: 15N Direction: ZX

Magnitude: 21N Direction: XZ

Magnitude: 15N Direction: WY

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