Laws of Motion Test

Result

Laws of Motion Test - 87

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Weekly Quiz Competition

Question 1
4 / -1

A block of mass 10 kg is placed on a rough horizontal surface having coefficient of friction µ = 0.5. If a horizontal force of 100 N is acting on it, then acceleration of the block will be

A
0.5 m/s²

B
5 m/s²

C
10 m/s²

D
15 m/s²

Solution
Question 2
4 / -1

Two iron blocks of equal mass but with double surface area slide down an inclined plane with friction coefficient µ. If the first block with surface area. A experience a frictional force f, then the second block with surface area 2A will experience a frictional force

A
f/2

B
f

C
2f

D
4f

Solution
Question 3
4 / -1

A body of mass 5 kg rests on a rough horizontal surface of coefficient of friction 0.2. The body is pulled through a distance of 10 m by horizontal force of 25 N. The kinetic energy acquired by it is (g = 10 m/s²)

A
330 J

B
150 J

C
100 J

D
50 J

Solution
Question 4
4 / -1

A motorcycle is travelling on a curved track of radius 500m. If the coefficient of friction between road and tyres is 0.5, the speed avoiding skidding will be

A
50 m/s

B
75 m/s

C
25 m/s

D
35 m/s

Solution
Question 5
4 / -1

A fireman of mass 60 kg slides down a pole. He is pressing the pole with a force of 600 N. The coefficient of friction between the hands and the pole is 0.5, with what acceleration will the fireman slide down(g = 10 m/s²)

A
1 m/s²

B
2.5 m/s²

C
10 m/s²

D
5 m/s²

Solution
Question 6
4 / -1

A block of mass M = 5 kg is resting on a rough horizontal surface for which the coefficient of friction is 0.2. When a force F = 40 N is applied, the acceleration of the block will be (g = 10 m/s²)

A
5.73 m/sec²

B
8.0 m/sec²

C
3.17 m/sec²

D
10.0 m/sec²

Solution
Question 7
4 / -1

Consider a car moving on a straight road with a speed of 100 m/s. The distance at which car can be stopped is [µ_k = 0.5]

A
100 m

B
400 m

C
800 m

D
1000 m

Solution
Question 8
4 / -1

A block B is pushed momentarily along a horizontal surface with an initial velocity V. if µ is the coefficient of sliding friction between B and the surface, block B willcome to rest after a time

A
V / (gµ)

B
gµ /V

C
g/V

D
V/g

Solution
Question 9
4 / -1

A gramophone record is revolving with an angular velocity ω. A coin in placed at a distance r from the centre of the record. The static coefficient of friction is µ. The coin will revolve with the record if

A

B

C

D

Solution
Question 10
4 / -1

An iron block of mass 5 kg is kept on a trolley. If the trolley is being pushed with an acceleration of 5 m/s². What will be the force of friction between the block and the trolley Surface? (Take the coefficient of static friction between the block and the surface to be 0.8).

A
Zero

B
5 N

C
4 N

D
25 N

Solution