Force Test

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Force Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

A set of forces acts on a ball as shown below.

In which direction will the ball move?

A
The ball will not move.

B
The ball will move towards right.

C
The ball will move towards left.

D
The ball will be lifted upwards.

Solution

Force acting from right side = 6 N + 3 N = 9 N
Force acting from left side = 8 N + 2 N = 10 N
The ball will move towards left because force from left side is more.
Question 2
1 / -0

A net force of 10 N produces an acceleration of 5 ms^-2. Calculate the net force required to accelerate the same object at the rate of 1 ms^-2.

A
1.0 N

B
2.0 N

C
5.0 N

D
50 N
Question 3
1 / -0

A force acts for 0.2 s on a body of mass 2.4 kg, initially at rest. The force then ceases to act and the body moves with a velocity of 4 m/s. What is the magnitude of the force?

A
24 N

B
12 N

C
48 N

D
2 N
Question 4
1 / -0

A force of 8 N is applied on an object for 3.0 s to change its velocity from 20 ms^-1 to 40 ms^-1. What is the mass of the object?

A
6.7 kg

B
2.1 kg

C
53.3 kg

D
1.2 kg
Question 5
1 / -0

A motorcar of mass 1000 kg is moving with a velocity of 54 km/hr and it takes 3 s to stop the motorcar after the brakes are applied. What is the force exerted by the brakes on the motorcar?

A
18000 N

B
500 N

C
5000 N

D
5400 N
Question 6
1 / -0

A ball of mass 30 g is moving with a velocity of 10 cm/s. What is the force required to bring it to rest in 0.1 s?

A
3000 N

B
300 N

C
3 N

D
0.03 N
Question 7
1 / -0

On jumping from a moving bus or a train, a man falls forward. What is the reason behind this?

A
Inertia of rest of the body.

B
Inertia of motion of upper part of the body.

C
Speed of train or bus.

D
Direction of the train or bus.
Question 8
1 / -0

Why is a man hit harder when he falls on a concrete floor than on sand from the same height?

A
Because in the latter case the feet of the man are brought to rest in a longer time than in the former case.

B
Because in the latter case friction is more than in the former case.

C
Because in the latter case sand pores serve as cushions.

D
Because in the latter case velocity is more than in the former case.
Question 9
1 / -0

When a boy pulls a cart, which force causes him to move forward?

A
The force that the cart exerts on him.

B
The force that he exerts on the cart.

C
The force that he exerts on the ground with his feet.

D
The force that the ground exerts on his feet.
Question 10
1 / -0

A ball thrown vertically upwards by a person in a moving train comes back to his hand.
Identify the law.

A
Law of inertia

B
Third law of motion

C
Second law of motion

D
None of these
Question 11
1 / -0

An object of mass 2 kg travelling in a straight line with a velocity of 20 ms^-1 collides and sticks to a stationary wooden block of mass 6 kg and then move off as one object.
What is the total momentum before and after the impact? Also, calculate the velocity of the combined objects.

A
40 kg m/s, 20 kg m/s, 10 m/s

B
40 kg m/s, 40 kg m/s, 5 m/s

C
20 kg m/s, 20 kg m/s, 5 m/s

D
40 kg m/s, 70 kg m/s, 5 m/s
Question 12
1 / -0

A bullet of mass 40 g is horizontally fired with a velocity 160 ms^-1 from a pistol of mass 4 kg. What is the recoil velocity of the pistol?

A
16 ms^-1

B
0.6 ms^-1

C
1600 ms^-1c

D
1.6 ms^-1
Question 13
1 / -0

Two blocks m and M of masses 2 kg and 4 kg respectively, are in contact with a frictionless table. A horizontal force F of 6 N is applied to m. What is the force of contact between the blocks?

A
2 N

B
4 N

C
6 N

D
1 N
Question 14
1 / -0

A block of mass 3.8 kg is suspended from a rigid support by an inextensible wire of length 1 m and having a uniform mass 0.4 kg/m. The system has an upward acceleration of 0.2 m/s². What is the tension at the midpoint of the wire?
(Take g = 9.8 m/s²)

A
42 N

B
38 N

C
40 N

D
38.4N
Question 15
1 / -0

Two boxes A and B touching each other are at rest on a horizontal frictionless surface. Box A has a mass of 25 kg and box B has a mass of 15 kg. A person applies a force of 30 N on box A, which in turn pushes box B. What is the acceleration of both the boxes?

A
0.75 ms^-2

B
1.2 ms^-2

C
2 ms^-2

D
3 ms^-2
Question 16
1 / -0

Two boxes A and B of identical material but different masses are placed next to each other on a horizontal rough surface. An applied force acting on box A causes both the boxes to accelerate at 2 m/s² (right). If the magnitude of the force of friction on box B is 26N, what is the force exerted by box B on box A?

A
20 N

B
50 N

C
24 N

D
2 N
Question 17
1 / -0

Two blocks of identical material are connected by a light rope as shown in the figure and a force is applied towards the left. How much acceleration is produced in the blocks?

A
6 ms^-2

B
3 ms^-2

C
12 ms^-2

D
2 ms^-2
Question 18
1 / -0

It is difficult to walk on ice because of

A
large inertia

B
large friction

C
less friction

D
absence of inertia
Question 19
1 / -0

The resistance offered by an object to an applied force is referred to as

A
friction

B
reaction

C
inertia

D
potential
Question 20
1 / -0

Which of the following statements about frictional force is/are correct?
(i) The direction of the force of friction always opposes the force causing motion.
(ii) The force of friction depends upon the nature of the surfaces in
contact with each other.
(iii) The force of friction is independent of the area of the surfaces in contact with each other.

A
(i)

B
(ii)

C
(i), (ii) and (iii)

D
(i) and (ii)

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Force Test - 5

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Force Test - 5

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Question 1

The ball will not move.

The ball will move towards right.

The ball will move towards left.

The ball will be lifted upwards.

Solution

Question 2

1.0 N

2.0 N

5.0 N

50 N

Question 3

24 N

12 N

48 N

2 N

Question 4

6.7 kg

2.1 kg

53.3 kg

1.2 kg

Question 5

18000 N

500 N

5000 N

5400 N

Question 6

3000 N

300 N

3 N

0.03 N

Question 7

Inertia of rest of the body.

Inertia of motion of upper part of the body.

Speed of train or bus.

Direction of the train or bus.

Question 8

Because in the latter case the feet of the man are brought to rest in a longer time than in the former case.

Because in the latter case friction is more than in the former case.

Because in the latter case sand pores serve as cushions.

Because in the latter case velocity is more than in the former case.

Question 9

The force that the cart exerts on him.

The force that he exerts on the cart.

The force that he exerts on the ground with his feet.

The force that the ground exerts on his feet.

Question 10

Law of inertia

Third law of motion

Second law of motion

None of these

Question 11

40 kg m/s, 20 kg m/s, 10 m/s

40 kg m/s, 40 kg m/s, 5 m/s

20 kg m/s, 20 kg m/s, 5 m/s

40 kg m/s, 70 kg m/s, 5 m/s

Question 12

16 ms-1

0.6 ms-1

1600 ms-1c

1.6 ms-1

Question 13

2 N

4 N

6 N

1 N

Question 14

42 N

38 N

40 N

38.4N

Question 15

16 ms^-1

0.6 ms^-1

1600 ms^-1c

1.6 ms^-1

0.75 ms^-2

1.2 ms^-2

2 ms^-2

3 ms^-2

6 ms^-2

3 ms^-2

12 ms^-2

2 ms^-2