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.

Assignment 1 IX (uniform motion)

Q1 Draw a d-t graph for a ball at rest , when the ball is 4m away from the origin.

Q2 Draw a d-t graph of a ball which starts from rest and then its speed increases with time.

Q3 Draw a d-t graph for an object noving with constant velocity 2m/s2.

Q4 What does the speedometer of bus indicates?

Q5 Name the physical quantity that corresponds to rate of change of velocity.

Q6 Give one example of a uniform motion in a straight line in which velocity is chamging at unoform rate.

Q7 Give one example of a non - uniform motion in which acceleration is not constant.

Q8 Give an example of a motion in which the acceleration is in teh direction of motion.

Q9 Name the physical quantity which remains constant during uniform circular motion.

Q10 Name the physical quantity which changes during uniform circular motion.