Assignment 2 IX

Q1 Two balls of A and B of masses m and 2m are in motion with velocities 2v and v respectively.calculate the ratio of their momenta.

Q2 Two bodies A and B of sane masses are moving with velocities V and 3V respectively. Compare their a) inertia b)momentum c) the force needed to stop them.

Q3 The speed of car weighing 1500 kg increases from 40m/s to 50m/s. calculate the change in its momentum. (Ans 15000 kgm/s)

Q4 Name the property of the material bodies which resist any change in their state of rest or of uniform motion.

Q5 State two factors that determine the momentum of the body.

Q6 Newton's first law is also called law of inertia. why?

Q7 Give the direction of the magnitude and direction of the net force acting on
A) a drop of rain falling down with a constant speed
B) a cork of mass 10g floating on water.
C) a kite held stationary in the sky.