Newtons Laws Impulse And Momentum

Question 1

Newtons first law of motion(law of inertia)

Answer 1

An object will remain at rest or continue to move at a constant velocity unless acted upon by a resultant (net) external force.

Question 2

Newtons second law of motion

Answer 2

The rate of change of momentum of an object is directly proportional to the resultant force acting on it and occurs in the direction of the force.

F=ma

F=dp/dt. (Change in momentum/change in time)

Question 3

Newtons 3rd law of motion

Answer 3

For every action, there is an equal and opposite reaction.
That is: If object A exerts a force on object B, then object B exerts a force of equal magnitude and opposite direction on object A.

Question 4

Impulse

Answer 4

The average net force on an object multiplied by the time it acts on it

F=dp/dt

F(dt)=dp

Impulse=p2-p3

Force-time graph impulse =area

Question 5

Momentum

Answer 5

P=mv
(Kgms^-1)

Question 6

Principle of conservation of momentum

Answer 6

In a closed system, the total momentum before an interaction is equal to the total momentum after the interaction, provided no external forces act.

Question 7

Elastic and inelastic collision

Answer 7

Perfectly elastic ke is conserved

Inelastic momentum is conserved