3. Mechanics

Question 1

What is terminal velocity?

Answer 1

For an object in free fall, when the AR = Weight the object is moving at terminal velocity as the resultant force is 0.

Question 2

What is newton’s first law of motion?

Answer 2

An object stays in motion or stationary when there’s no resultant force acting on it

Question 3

What is Newton’s second law of motion?

Answer 3

F = m*a
or F = rate of change of momentum

Question 4

What is Newton’s Third law of motion

Answer 4

For every force there’s an equal and opposite reaction force

Question 5

What is the momentum equation?

Answer 5

Momentum = mass x velocity

Question 6

What is impulse?

Answer 6

I = F x t = change of momentum

Question 7

What is an elastic collision

Answer 7

When kinetic energy and momentum is conserved.

Question 8

What is the principal of moments?

Answer 8

For an object to be in equilibrium, the sum of anticlockwise moments about a pivot is equal ot the sum of clockwise moments

Question 9

What is the centre of mass of an object?q

Answer 9

The point at which the object’s mass acts downwards

Question 10

What is inelastic collision

Answer 10

The momentum is conserved but the kinetic energy is not conserved

Question 11

Power equation

Answer 11

Fv = rate of energy transfer

Question 12

Principal of conservation of energy

Answer 12

Energy is always conserved, it cannot be created or destroyed only transferred