Biomechanics: Kinetic Concepts - Comprehension

Internal forces are produced by :

• gravity

• friction

• muscles

• water resistance

Linear Momentum is :

• the amount of acceleration of a body

• acceleration times mass of a body

• mass times velocity of a body

• always changing when a body is moving

A basketball centre weighing 90 kg. collides with a guard weighing 70 kg. Both players were prepared for the contact but the centre was knocked to the floor.

• both players were travelling at the same speed

• the centre was travelling twice as fast as the guard

• the guard was travelling twice as fast as the centre

• none of the above

An example of an activity involving simultaneous force summation is :

• cricket bowling

• goal shooting in netball

• a high jump take-off

• a hockey drive

In order to effectively summate forces :

• the muscles with the least inertia should initiate the movement

• the muscles with the greatest inertia should initiate the movement

• the larger muscles apply their forces toward the end to build power

• the faster muscles must be utilised first

Which of the following is true?

• Rolling friction is less than sliding friction

• Rolling friction is equal to sliding friction

• Rolling friction is greater than sliding friction

• none of the above

If the radius of a tennis racquet is doubled, what is the effect on moment of inertia ?

• it stays the same

• it is doubled (X 2)

• it is tripled (X 3)

• it is quadrupled (X 4)

The greater an object's mass then :

• the greater its inertia

• the greater is the force required to move it

• the greater is its resistance to change

• all of the above

List four external forces that can act on a body.

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Answer explanation

gravity, friction, air resistance, fluid resistance.

What is the formula for impulse?

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Answer explanation

Force X Time