Biomechanical principles

Question 1

Explain Newton’s first law of motion

Answer 1

Inertia:
A force is required to change an objects state of motion

Question 2

Explain Newton’s second law of motion

Answer 2

Acceleration:
Magnitude and direction of the force determines the magnitude and direction of the acceleration

Question 3

Explain Newton’s third law of motion

Answer 3

Action / Reaction:
For every action there is an equal and opposite reaction

Question 4

What is the equation including speed and distance?

Answer 4

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

Question 5

Define centre of mass

Answer 5

The point of balance of a body

Question 6

Name the 4 mechanic principles that affect stability

Answer 6

1. Height of centre of mass
2. Line of gravity
3. Area of base support
4. Mass of performer

Question 7

Explain what characteristics improve stability

Answer 7

Lower centre of mass
Central line of gravity over base support
More contact points / Larger area of base support
Greater mass of performer