Dynamics

Question 1

Mass

Answer 1

It is the property of an object that resist change in its state of motion or rest.

Question 2

Momentum

Answer 2

It is the product of mass and velocity.
p=m*v

Question 3

Newton’s first law of motion

Answer 3

If net force is 0, object will not change its state of motion or rest.

Question 4

Newton’s second law of motion

Answer 4

Net force is directly proportional to rate of change in momentum.

Question 5

Force

Answer 5

Rate of change in momentum

Question 6

Newton’s third law of motion

Answer 6

When two body interact. They exert force on each other which is equal in magnitude and opposite in motion.

Question 7

Law of conservation of linear momentum

Answer 7

If no external forces are acting, momentum before the interaction is equal to momentum after the interaction. The total momentum in an isolated system is constant.

Question 8

Elastic collision

Answer 8

If the kinetic energy of the system remain same before and after collision then it is elastic collision.

Question 9

Relative speed

Answer 9

It is the speed of any object in respect to one another.

Question 10

Elastic collision(2)

Answer 10

If the relative speed of approach is equal to relative speed of separation then it is elastic collision. All sticky and explosive collisions are inelastic.

Question 11

usage of +ve sign

Answer 11

In finding momentum, same direction +ve.
In finding relative speed, opposite direction +ve