Force Test - 2...

An object of mass 2 kg travelling in a straight line with a velocity of 20 ms^-1 collides and sticks to a stationary wooden block of mass 6 kg and then move off as one object.
What is the total momentum before and after the impact? Also, calculate the velocity of the combined objects.

A bullet of mass 40 g is horizontally fired with a velocity 160 ms^-1 from a pistol of mass 4 kg. What is the recoil velocity of the pistol?

Two boxes A and B touching each other are at rest on a horizontal frictionless surface. Box A has a mass of 25 kg and box B has a mass of 15 kg. A person applies a force of 30 N on box A, which in turn pushes box B. What is the acceleration of both the boxes?

It is difficult to walk on ice because of

The resistance offered by an object to an applied force is referred to as

Which of the following statements about frictional force is/are correct ?

(i) The direction of the force of friction always opposes the force causing motion.
(ii) The force of friction depends upon the nature of the surfaces in
contact with each other.
(iii) The force of friction is independent of the area of the surfaces in contact with each other.