3: Dynamics

Question 1

Define mass

Answer 1

Mass is the property which resist the change in direction

Question 2

Define momentum

Answer 2

Momentum is the product of the mass and its velocity

p = mv

Question 3

Define force

Answer 3

Force is the rate of change of momentum

Question 4

Define impulse

Answer 4

Impulse on the body refers to the product between the force acting on it and the time that the force is exerted

Impulse = Ft

Question 5

Define N1L

Answer 5

N1L states that a body will remain at rest or constant velocity unless an external resultant force is exerted on the body

Question 6

Define N2L

Answer 6

N2L states that the rate external resultant force exerted on a body is proportional to the rate of change of momentum of the body;
and the change in momentum is in the direction of the force.

Question 7

Define N3L

Answer 7

N3L states that when body A exerts a force on body B, an equal but opposite force is exerted by body B on body A.

Question 8

Define Principle Of Conseravtion Of Linear Momentum

Answer 8

POCOLM states that the sum of initial momentums must be equal to the sum of final momentums provided that there are no external resultant forces acting on the bodies

Question 9

State the three types of collisions and differentiate them

Answer 9

1. (Perfectly) Elastic: NO KE LOST/ Relative speed of approach = relative speed separation
2. Inelastic: KE LOST
3. Superelastic: KE GAINED