5.1 Biomechanical Principles

Question 1

What are Newton’s laws of linear motion

Answer 1

• Newton’s first law = law of inertia
• Newton’s second law = law of acceleration
• Newton’s third law = law of action/reaction

Question 2

Newton’s first law (law of inertia)

Answer 2

Force required to change state of motion

Question 3

Newton’s second law (law of acceleration)

Answer 3

Magnitude (size) + direction of force determines magnitude + direction of acceleration

Question 4

Newton’s third law (law of action/reaction)

Answer 4

Action force = to reaction force

Question 5

Definitions + equations + unit for speed

Answer 5

Defined as rate of change of position

Speed in m/s = distance in (m) / time in (s)

Question 6

Definition, equation + unit of distance

Answer 6

Defined as length of the path a body follows when moving from one position to another.

Distance (m) = speed(m/s) x time (s)

Question 7

Centre of mass + factors affecting

Answer 7

• point of concentration of mass or point of balance of a body

Factors affecting:
- height of centre of mass
- line of gravity
- area if the base of support
- mass of performer