Biomechanical Movement

Question 1

What is inertia

Answer 1

Resistance of an object has to change its state of motion

Question 2

Newtons first law

Answer 2

A force is required to change its state of motion
-if an object is at rest, it will stay at rest
-if an object is moving it will remain going in that direction at the same velocity until another force is exerted on it
-Large mass=Larger inertia of object=more force to change state of motion

Question 3

Newtons second law

Answer 3

Law of acceleration
-magnitude and direction of the force applied to a body determines the magnitude+direction of the acceleration given to the body.
-directly proportional to the force applied
-Force=MassXAcceleration

Question 4

Newtons third law

Answer 4

Law of action/reaction
-Action and reaction are equal opposite and always occurs in pairs
-At start of sprint race athlete pushes back as hard as possible (action) and the blocks push forward on the athlete (reaction) to provide acceleration on athlete
-Most questions on third law involves a ground reaction force (GRF). This is a force exerted on the ground by the body in contact without.

Question 5

Centre of mass and what forces can be applied to it

Answer 5

Its the point of concentration of mass- point of balance of a body
-Human COM is constantly changing
-Raise arms moves COM higher
-Typically around hip region
-Force applied through COM/concentric force-body moves in straight line/linear
-Force not applied through COM/eccentric force-rotation/angular motion produced