Laws of Motion Test

Result

Laws of Motion Test - 43

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Question 1
4 / -1

A 2 kg mass starts from rest on an inclined smooth surface with inclination 30^o and length 2 m. How much will it travel before coming to rest on a frictional surface with frictional coefficient of 0.25?

A
4 m

B
6 m

C
8 m

D
2 m

Solution
Question 2
4 / -1

A block rests on a rough inclined plane making an angle of 30^o with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of the block (in kg) is (take g = 10 m/s²)

A
2.0

B
4.0

C
1.6

D
2.5

Solution
Question 3
4 / -1

A body takes rime t to reach the bottom of an inclined plane of angle θ with the horizontal, If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is

A

B

C

D

Solution
Question 4
4 / -1

A coin of mass 10 g is placed over a book of length 50 cm. The coin is on the verge of sliding when one end of the book is lifted 10 cm up. The coefficient of static friction between the book and the coin is

A
1.0

B
0.4

C
0.3

D
0.2

Solution
Question 5
4 / -1

An object placed on an inclined plane starts sliding when the angle of incline becomes 30^o. The coefficient of static friction between the object and the plane is

A

B

C

D
Question 6
4 / -1

A block of mass 200 kg is being pulled up by men on an inclined plane at angle of 45^o as shown. The coefficient of static friction is 0.5. Each man can only apply a maximum force of 500 N. Calculate the number of men required for the block to just start moving up the plane

A
10

B
15

C
5

D
3

Solution
Question 7
4 / -1

A block at rest slides down a smooth inclined plane which makes an angle 60^o with the vertical and it reaches the ground in t₁ seconds. Another block is dropped vertically from the same point and reaches the ground in t₂ seconds. Then the ratio of t₁ : t₂ is

A
1 : 2

B
2 : 1

C
1 : 3

D
1 : √2

Solution
Question 8
4 / -1

A block of mass m lying on a rough horizontal plane is acted upon by a horizontal force P and another force Q inclined at an angle θ to the vertical. The block will remain in equilibrium, if the coefficient of friction between it and the surface is

A

B

C

D

Solution
Question 9
4 / -1

Which of the following is correct, when a person walks on a rough surface?

A
The frictional force exerted by the surface keeps him moving

B
The force which the man exerts on the floor keeps him moving

C
The reaction of the force which the man exerts on floor keeps him moving

D
None of the above
Question 10
4 / -1

A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is

A
2.5 N

B
0.98 N

C
4.9 N

D
0.49 N

Solution