Chapter 2 - Momentum And Newtons Laws

Question 1

NSL of motion?

Answer 1

The net force acting on an object is equal to the rate of change of its momentum. The net force and the change in momentum are in the same direction.

Question 2

F = ?

Answer 2

Δp/Δt = (mv-mu)/t = m((v-u)/t) = ma

Only when mass is constant

Question 3

NTL of motion and 4 criteria?

Answer 3

When two bodies interact, the forces they exert on each other are equal and opposite.

The two forces:

• act on different bodies
• are equal in magnitude
• are opposite in direction
• are of the same type

Question 4

Impulse of a force = ?

Answer 4

Δmomentum = force x time = area under a force against time graph

Question 5

NFL of motion?

Answer 5

An object will remain at rest or keep travelling at constant velocity unless it is acted on by an external force.