Biomechanical Principles

Question 1

What are Newton’s 3 laws of linear motion ?

Answer 1

1st law – law of INERTIA
2nd law – law of ACCELERATION
3rd law – law of ACTION/ REACTION

Question 2

Explain Newton’s law of Inertia

Answer 2

An object will remain at constant velocity unless an external force is applied to it

Question 3

Explain Newton’s law of Acceleration

Answer 3

The size and the direction of the force applied determines the size and direction of the acceleration (F=ma)

Question 4

Explain Newton’s law of Action/Reaction

Answer 4

To every action there is an equal and opposite reaction

Question 5

What is the centre of mass ?

Answer 5

The point of balance of a body (concentration of mass)
Generally the CoM is in between the hip region

Question 6

What factors affect stability ?

Answer 6

The height of the centre of mass
Position of the line of gravity
Area of the support base
Mass of the performer