Momentum (M3)

Question 1

Momentum

Answer 1

The product of mass and velocity
Unit: kgms^-1 or Ns

Question 2

Law of conservation of momentum

Answer 2

For a system of interacting objects, the total momentum in a specified direction remains constant as long as no external forces act on the system

Question 3

Elastic and inelastic collision

Answer 3

Elastic: total kinetic energy is conserved
Inelastic: kinetic energy is transferred to other forms such as heat

Question 4

Impulse

Answer 4

The area under a force-time graph
The product of force and the time for which the force acts
Unit:kgms^-1 or Ns

Question 5

Derivation of impulse from Newton’s second law

Answer 5

Net force = rate of change if momentum
F = dp/dt
F(dt) = dp
Impulse = Ft
So impulse = dp = change in momentum

Question 6

Newton’s second law

Answer 6

The rate of change of momentum of an object is directly proportional to the resultant force and takes place in the direction of the force