Question 1 :
An object of mass 2 kg is sliding with a constant velocity of $4ms^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

Question 2 :
An object of mass 1 kg travelling in a straight line with a velocity of 10 m/s collides with, and sticks to, a stationary wooden block of mass 5 kg. Then, they both move off together in the same straight line. What is the velocity of the combined object?

Question 3 :
A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. lts velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. What is the change in momentum?

Question 4 :
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to

Question 5 :
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, what will be the net force of person who catches it?

Question 6 :
Suppose a ball of mass m is thrown vertically upward with an initial speed v, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed v again before striking the ground. It implies that the magnitude of initial and final momentums of the ball are same. Yet, it is not an example of conservation of momentum. Why?

Question 7 :
Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m/s and 1 m/s, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 m/s. What is the velocity of the second object?

Question 8 :
A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. What is the force acting on it if its mass is 7 tonnes?

Question 9 :
Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction?

Question 10 :
A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. lts velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. What is the acceleration?