Question

Question 35:
Name the laws involved in the following situations :
(a) the sum of products of masses and velocities of two moving bodies before and after their collision remains the same.
(b) a body of mass 5 kg can be accelerated more easily by a force than another body of mass 50 kg under similar conditions
(c) when person A standing on roller skates pushes another person B (also standing on roller skates) and makes him move to the right side, then the person A himself gets moved to the left side by an equal distance.
(d) if there were no friction and no air resistance, then a moving bicycle would go on moving for ever.

Lakhmir Singh Physics Class 9

Answer 1

Answer:

d. yes moving bicycle is always moving

Answer 2

Dear Student,

◆ Answers -

(a) Law of conservation of momentum

Total momentum of system always remains constant.

(b) Newton's 2nd law of motion

Acceleration is inversely proportional to mass when force is constant.

(c) Newton's 3rd law of motion

Every action has opposite reaction.

(d) Newton's 1st law of motion

An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

Thanks dear. Hope that is helpful...