Bio mechanical principles and levers

Question 1

Define linear motion

Answer 1

Motion in a straight or curved line, with all body parts moving the same direction at the same speed in same direction

Question 2

Define Inertia

Answer 2

Resistance an object has to a change in its state of motion

Question 3

What is Newton’s first law of inertia

Answer 3

A force is required to change the state of motion

Question 4

The magnitude and direction of the force determines the magnitude and direction of acceleration

Answer 4

Second law of acceleration

Force is directly proportional acceleration

Question 5

What is Newton’s thirds law of motion

Answer 5

Every action there is an equal force amount

Question 6

Give examples of scalar quantities

Answer 6

Speed,distance, mass and temperature

Described by their magnitude

Question 7

Define centre of mass

Answer 7

Point of concentration of mass

Question 8

Define factors that affect stability

Answer 8

Height of the centre of mass- lowering the centre, increase stability
Position of line of gravity- central over the base of support to increase stability
Area of support base - more contact points the larger BOS

Question 9

What are leavers

Answer 9

Allow us to move

Fulcrum Load Effort

Question 10

What is mechanical advantage and disadvantage

Answer 10

Advantage FE> FR

Disadvantage- FR>FE

Question 11

What lever system operates during plantar- flexion of the ankle joint

Answer 11

Second class lever system 
Advantage: Generate much league force, whole body 
Disadvantage: limited range of movement

Question 12

Using Newton’s second law of motion, explain how an athlete is able to accelerate towards the finish line

Answer 12

Force - acceleration

Have to apply large force internally, leg muscle