Laws Of Motion

Question 1

Newton’s first law

Answer 1

An object at rest, remains at rest and an object in motion, remains in motion unless acted upon by an external force

(If sum of all forces acting on a particle is zero, then the particle remains in accelerated)

Question 2

Newton’s first law of motion is only applicable everywhere

Answer 2

No

The validity of Newton’s 1st law depends on the frame of reference from which the observer measures the state

Question 3

Newton’s second law of motion

Answer 3

The force on an object equals to the rate of change of its momentum wrt time

F= dp/dt
OR
F=ma

Question 4

Newton’s 3rd law

Answer 4

For every action there’s an equal and opposite reaction

Question 5

Impulse

Answer 5

Change in momentum
- I = F × dt
- I = m [v - u]

Question 7

Area under force time graph gives

Answer 7

Impulse

Question 8

Recoil velocity of gun

Answer 8

V= -(m*v)/M

m: mass of bullet
v: velocity of bullet
M: mass of gun