Biomechanical Principles

Inertia

• is the rate of change of an object's position

• determines that rate of angular velocity

• is the resistance of a body to change its state of motion

• is directly proportional to velocity

According to Newton's 2nd law of motion, the acceleration of an object is proportional to (a)   and

(b)  

• Force
• Air Resistance
• Gravity
• Mass

In this image the forces are equal and opposite. What will happen to the bat upon impact?

This image represents which class lever?

• 1st class lever

• 2nd class lever

• 3rd class lever

This image represents which class lever?

• 1st class lever

• 2nd class lever

• 3rd class lever

A sprinter is able to accelerate from the blocks due to a combination of:

• friction and air resistance

• weight and friction

• internal force and friction

• internal force and gravity

Which letter has been labelled incorrectly in the diagram?

• R

• F

• W

• AR

Stability:

• Refers to the degree to which a body resists changing its equilibrium.

• Is impacted by height and line of the centre of gravity.

• Is impacted by the size of the base of support.

• Is impacted by the mass of an object and friction between bodies.

• Is impacted by the friction between to objects. eg a rugby player would use boots with long stops in them to increase friction and thus stability.

Which of the following will change if you lift your arms above your head?

• Axis of rotation

• Base of Support

• Number of contact points

• Centre of Mass

Which of the following will decrease stability?

• Lowering COM

• Increasing the base of support

• Reducing the number of points of contact.

• Wearing studs on grass.