Yr 12 - Newtons Laws

Question 1

Newtons 1st Law

Answer 1

Object at rest/motion stays at rest/motion unless acted upon by a net force.

Question 2

Newtons 2nd Law

Answer 2

Rate of change of momentum ∝ Resultant Force
- Change in P in same direction as force.
- F = △P / △t
- F= M A
- P = M V

Question 3

Newtons 3rd Law

Answer 3

When Body A exerts a force on Body B, Body B exerts an equal and opposite force on Body A of the same type.

Question 4

What is Impulse?

Answer 4

Change in Momentum (P)

Question 5

Equation for impulse

Answer 5

J (Impulse) = F (Force) x △t (Time)

Question 6

What does the area of a Force-Time graph represent?

Answer 6

Impulse

Question 7

Momentum

Answer 7

Product of mass & velocity of an object.

Question 8

Principle of Conservation of momentum.

Answer 8

Total linear momentum of a system remains constant in collisions provided no external forces are applied.
- In a closed system, total momentum before = total momentum after.

Question 9

The 3 types of collisions and their characteristics.

Answer 9

*Momentum is always conserved
* & Provided no external forces applied

Elastic
- No KE lost

Inelastic
- KE lost

Perfect inelastic
- Objects stick together after collision