Dynamics

Question 1

Newton’s First Law (Law of Inertia)

Answer 1

States that every object continues in its state of rest or uniform motion in a straight line unless it is acted upon by an external resultant force.

Question 2

Newton’s Second Law (Law of Momentum)

Answer 2

States that the rate of change of momentum of a body is proportional to the resultant force acting on it and the change occurs in the direction of the force.
+
F = dp/dt =ma

Question 3

Newton’s Third Law (Law of action & reaction)

Answer 3

States that if a body A exerts a force on body B, then body B will exert an equal but opposite force on body A

Question 4

Principle of Conservation of Momentum

Answer 4

States that when bodies in a system interact, the total momentum of the system remains constant, provided no net external force acts on it.

Question 5

Impulse

Answer 5

The product of a force F acting on an object and the time delta t for which the force acts

Question 6

Elastic Collisions

Answer 6

Both momentum and KE are conserved (hit then split)

relative speed of approach = relative speed of separation

Question 7

Inelastic collisions

Answer 7

Only momentum is conserved. KE is not conserved.

Perfect Inelastic Collisions (objects move together after colliding): final velocity of Ma and Mb is the same