Biomechanics

Question 1

What are Newtons three laws of Motion

Answer 1

1st) Law of inertia: A body will remain at rest unless acted upon by an external or unbalanced force

2nd) Acceleration: There is a direct relationship between force applied to a body and its resulting acceleration

3rd) Action- Reaction: For every action force there is an equal and opposite reaction force

Question 2

Give an example of first, second and third class levers

Answer 2

First class levers: Tricep extensions

Second class levers: Calf raises

Third class lever: Bicep curl

Question 3

Which lever systems have a mechanical advantage and which have a mechanical disadvantage

Answer 3

First and second class levers have a mechanical advantage and third class have a mechanical disadvantage

Question 4

Give 3 examples of technologies that analyse movement

Answer 4

1) Motion Capture
2) Force Platforms
3) Video analysis

Question 5

What are the four variables for linear motion and their units of measurements

Answer 5

Distance (metres)
Displacement (metres)
Speed( metres/second)
Velocity( metres/ second)
Acceleration( metres/ second squared)

Question 6

What are the formulas for Speed velocity and acceleration

Answer 6

Speed= Distance/ Time
Velocity= Displacement/ Time
Acceleration= ( Final velocity- initial velocity) / time

Question 7

What is Linear Motion

Answer 7

Motion in a straight line or curved line where all parts of the body move the same distance at the same time

Question 8

What is angular motion

Answer 8

The movement of a body in a circular path about an axis of rotation

Question 9

What is Angular velocity, its formula and measurement

Answer 9

The rate of change in angular displacement.

Angular velocity= angular displacement/ time taken

Measured in radians/ second

Question 10

What is Moment of Inertia

Answer 10

The resistance of a body to change its state of angular motion or rotation