Force Test - 8...

A particle is in straight line motion with uniform velocity. A force is not required

An object will continue accelerating until

A boy sitting on the top most berth in the compartment of a train, which is just going to stop on a railway station, drops an apple aiming at the open hand of his brother sitting vertically below him at a distance of about 2m. The apple will fall

A man of weight W is standing on a lift, which is moving upward with acceleration `a`. The apparent weight of the man is

A lift is moving upward with an acceleration of 3 m/s² and g = 9.8 m/s². To carry a bag of mass 5 kg in his hands, a man in the lift has to exert a force of

Gravel is dropped into a conveyer belt at a rate of 0.5 kg/s. The extra force required in Newton to keep the belt moving at 2 m/s is

A ball falls from rest from a height h onto a floor, and rebounds to a height h/4. The coefficient of restitution between the ball and the floor is

A bullet weighing 50 g leaves the gun with a velocity of 30 m/s. If the recoil speed imparted to the gun is 1 m/s, the mass of the gun is

Two balls, each of mass 0.25 kg, are moving with 3m/s and 1m/s towards each other in a straight line collide. The balls stick together after the collision. The magnitude of the final velocity of the combined mass is

A body of mass m moving with a constant velocity v hits another body of the same mass moving with same velocity v but in the opposite direction and sticks to it. The velocity of the compound body, after collision, is

Two blocks of masses m₁ and m₂ are placed in contact with each other on a horizontal platform. The coefficient of friction between the platform and the two blocks is the same. The platform moves with an acceleration. The force of interaction between the blocks is

A car C of mass m₁ rests on a plank P of mass m₂. The plank rests on a smooth floor. The string and the pulley are ideal. The car starts and moves towards the pulley with acceleration. Which of the following assertions is correct?

In the figure given below, two masses m and m` are tied with a thread passing over a pulley. m` is on a frictionless horizontal surface. If acceleration due to gravity is g, the acceleration of m` in this arrangement will be

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. What will be the force constant of the longer piece?

Two bodies A and B each of mass M are fixed together by a mass less spring. A force F acts on the mass B as shown in figure. At the instant, the mass A has acceleration a. What is the acceleration of mass B?

A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 2.8 N is applied on the block parallel to floor, the force of friction between the block and floor is (taking g = 10 m/s²)

A line-man of mass 60 kg is holding a vertical pole. The coefficient of static friction between his hands and the pole is 0.5. If he is able to climb up the pole, what should be the minimum force with which he will press the pole with his hands? (g = 10 m/s²)

A block of mass 2 kg rests on a rough horizontal plank. The coefficient of friction between the plank and the block is 0.2. If the plank is pulled horizontally with a constant acceleration of 4 m/s², the distance moved by the block on the plank in 5 second starting from rest (in m) is (Take g = 10 m/s²)

Two men of unequal masses hold on to the two sections of a light rope passing over a smooth light pulley. Which of the following is/are possible?

A force-time graph for the motion of a body is shown in the figure. Change in linear momentum between 0 and 8 s, is