15.2 Levers and Balance Flashcards

1
Q

Describe Centre of Gravity

A

The point at which all parts of an object are balanced.

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2
Q

Describe Base of Support

A

The area of an object or person that is in contact with the ground

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3
Q

Describe Line of gravity

A

Imaginary line which passes through the centre of gravity and continues down into the centre of an objects base of support

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4
Q

Describe a 2nd Class lever using an example from the human body

A

Resistance in middle, axis and force at either end. Eg when doing a push up or calf raise.

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5
Q

Describe a 3rd Class lever using an example from the human body

A

Force/Effort in middle. Axis and resistance at either end. Most common in human body eg bicep curl.

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6
Q

Identify the mechanical advantage of a 2nd class lever

A

Greater than 1. Allow you to produce more force with less effort

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7
Q

Identify the mechanical advantage of a 3rd class lever

A

Less than 1. They can increase the range of motion and angular speed of the body part

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8
Q

Describe the force arm in a lever

A

the distance from the axis to the force

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9
Q

Describe the resistance arm in a lever

A

distance from the axis to the resistance

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