Laws of Motion Test

Result

Laws of Motion Test - 40

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Question 1
4 / -1

A block of mass 5 kg is on a rough horizontal surface and is at rest. Now a force of 24 N is imparted to it with negligible impulse. If the coefficient of kinetic friction is 0.4 and g = 9.8 m/s², then the acceleration of the block is

A
0.26 m/s²

B
0.39 m/s²

C
0.69 m/s²

D
0.88 m/s²

Solution
Question 2
4 / -1

A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is µ. What acceleration given to B will cause slipping to occur between A and B

A

B

C

D

Solution
Question 3
4 / -1

A car turns a corner on a slippery road at a constant speed of 10 m/s. If the coefficient of friction is 0.5, the minimum radius of the arc in meter in which the car turns is

A
20

B
10

C
5

D
4

Solution
Question 4
4 / -1

A motorcyclist of mass m is to negotiate a curve of radius r with a speed v. The minimum value of the coefficient of friction so that this negotiation may take place safely, is

A

B

C

D
Question 5
4 / -1

A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10 joule after it moves a distance 2 m. The frictional force is

A
10 N

B
15 N

C
20 N

D
30 N

Solution
Question 6
4 / -1

A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30^o to the upward drawn vertical which causes the block to just slide is

A
29.43 N

B
219.6 N

C
21.96 N

D
294.3 N

Solution
Question 7
4 / -1

A body of 10 kg is acted by a force of 129.4 N. If g = 9.8 m/s². The acceleration of the block is 10 m/s². What is the coefficient of kinetic friction?

A
0.03

B
0.01

C
0.30

D
0.25

Solution
Question 8
4 / -1

Force required to move a mass of 1 kg at rest on a horizontal rough plane (µ = 0.1 and g = 9.8 m/s²) is

A
0.98 N

B
0.49 N

C
9.8 N

D
4.9 N

Solution
Question 9
4 / -1

Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of kinetic friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is [g = 10 m/s²)

A
30 m

B
40 m

C
72 m

D
20 m

Solution
Question 10
4 / -1

A 500 kg horse pulls a cart of mass 1500 kg along a level road with an acceleration of 1 ms^–2. If the coefficient of sliding friction is 0.2, then the force exerted by the horse in forward direction is

A
3000 N

B
4000 N

C
5000 N

D
6000 N

Solution