biomechanics

Question 1

newtons first law: law of inertia

• definition
• example

Answer 1

definition
A body will remain in a state of rest or uniform velocity unless acted upon by an external or unbalanced forced

example
A football will remain in a state of rest on the penalty spot until a force is applied from the players.

Question 2

newtons second law: law of acceleration

• definition
• example

Answer 2

defintion
the accerlation (or rate of change in momentum) of a body is proportional to the size of the force applied and takes place in the direction in which the force acts.
F x m = A

example
the accerlation of a netball during a pass is proportional to the force from the players hand and is in the same direction as the force

Question 3

newtons third law: law of reaction

• definition
• example

Answer 3

definition
for every action there is an equal and opposite reaction. The reaction force is equal in the size and opposite in the direction to the action force.

example
when serving, a tennis player pushes downwards on the ground (action force) and the ground pushes upwards on the player (normal reaction force)