Biomechanics

Question 1

Newton’s First Law

Answer 1

Inertia: the body will remain at rest or in uniform motion unless acted upon by an external force
The heavier the object, the greater inertia required to move the force

Question 2

Newton’s Second Law

Answer 2

Acceleration/Momentum: a force applied to an object will produce a change in motion in the direction of the applied force, proportional to the size of the force

Question 3

Newton’s Third Law

Answer 3

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

Question 4

Torque

Answer 4

Angular motion caused by an eccentric force, being a force that does not pass through the object’s centre of gravity

Question 5

Inertia

Answer 5

A measure of how difficult it is to change an object’s motion
Greater inertia = more difficult to change the motion of an object

Question 6

Angular velocity (tucked vs distributed weight)

Answer 6

The speed of rotation of an object, which will continue rotating unless acted upon by an external force
If mass is located closer to axis of body, it’s easier to rotate than one whose mass is distributed further from axis

Question 7

First Class Lever

Answer 7

Axis between the resistance and force - to generate great speed or force (eg. crowbar, scissors)

Question 8

Second Class Lever

Answer 8

Resistance between force and axis - focus on force to increase strength that we can apply to objects (eg wheelbarrow)

Question 9

Third Class Lever

Answer 9

Force between axis and resistance - focus on speed/ROM as this is the most common lever in the body (eg. bicep curl, kick, throw)

Question 10

Increase Force Arm

Answer 10

less effort required to move the resistance, acting as a mechanical advantage

Question 11

Increase Resistance Arm

Answer 11

increase in speed/ROM of movement, more effort required to move resistance, acting as a mechanical disadvantage