Important Questions of Laws of Motion Physics | Zigya

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81.

A ball of mass 0.5 kg moving with a velocity of 2 ms-1 strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and wall is 10-3 s, the average force exerted by the wall on the ball is

  • 1125 N

  • 1000 N

  • 500 N

  • 2000 N


82.

Which of the following sets of concurrent forces may be in equilibrium ?

  • F1 = 3 N, F2 = 5 N, F3 = 1 N

  • F1 = 3 N, F2 = 5 N, F3 = 9 N

  • F1 = 3 N, F2 = 5 N, F3 = 6 N

  • F1 = 3 N, F2 = 2 N, F3 = 15 N


83.

Two equal forces (P each) act at a point inclined to each other at an angle of120°. The magnitude of their resultant is

  • P/2

  • P/4

  • P

  • 2P


84.

A student unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on his hair. He will not succeed

  • as the force exerted is small

  • the frictional force while gripping, is small

  • Newton's law of inertia is not applicable to living beings

  • as the force applied is internal to the system


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85.

Three long, straight parallel wires, carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

          

  • 5.2 × 103 N

  • 2.5 × 10-3 N

  • zero

  • 1.5 × 10-3 N


86.

The adjacent figure is the part of a horizontally stretched net. Section AB is stretched with a force of 10 N. The tensions in the sections BC and BF are

               

  • 10 N, 11 N

  • 10 N, 6 N

  • 10 N, 10 N

  • can't be calculated due to insufficient data


87.

A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is

  • 2 N

  • 4 N

  • 6 N

  • 8 N


88.

A body of mass 0.05 kg is observed to fall with an acceleration of 9.5 ms-2. The opposing force of air on the body is (g = 9.8 ms-2)

  • 0.015 N

  • 0.15 N

  • 0.030 N

  • zero


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89.

Three concurrent co-planar forces 1 N, 2 N and 3 N acting along different directions on a body

  • can keep the body in equilibrium if 2 N and 3 N act at right angle

  • can keep the body in equilibrium if 1 N and 2 N act at right angle

  • cannot keep the body in equilibrium

  • can keep the body in equilibrium in 1 N and 3 N act at an acute angle


90.

Two rectangular blocks A and B of masses 2 kg and 3 kg respectively are connected by a spring of spring constant 10.8 Nm-1 and are placed on a frictionless horizontal surface. The block A was given an initial velocity of 0.15 ms-1. in the direction shown in the figure. The maximum compression of the spring during the motion is

               

  • 0.01 m

  • 0.02 m

  • 0.05 m

  • 0.03 m


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