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Occupational Therapy > Force, Torque and Levers > Flashcards

Force, Torque and Levers Flashcards

1
Q

What is torque?

A

Torque is the effect of force on the rotational movement of a joint.

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2
Q

When is force generated?

A

Force is generated at the point of muscle attachment to the bone when an active muscle becomes tense

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3
Q

What other forces outside the body can cause movement?

A

Gravity and the weight of an object or body segment

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4
Q

What is a moment of force?

A

The product of the force and its distance from the fulcrum (force x distance).

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5
Q

What is a lever?

A

Rigid bar or structure that rotates around the fulcrum

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6
Q

What is the fulcrum?

A

centre of rotation/axis of rotation

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7
Q

What is force?

A

the motion

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8
Q

What is resistance?

A

load against the motion

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9
Q

What is the moment arm?

A

the distance between the fulcrum and the force

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10
Q

What is the resistance arm?

A

distance between the fulcrum and resistance

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11
Q

What are the three types of lever?

A

1st class, 2nd class and 3rd class

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12
Q

What is a first class lever?

A

the fulcrum is located between the force and resistance

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13
Q

What is a second class lever?

A

Resistance between fulcrum and force

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14
Q

What is a third class lever?

A

force is between fulcrum and resistance

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15
Q

What is the most common lever in the body?

A

Third class levers

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16
Q

What is the least common lever in the body?

A

First class levers

17
Q

What is an example of a first class lever?

A

see-saw - posterior neck muscles, head back and forward

18
Q

What is an example of a second class lever?

A

push up - the calf when plantarflexing

19
Q

What is an example of the third class lever?

A

Swinging a bat - bicep curls

20
Q

How is the type of lever determined?

A

By location of force, resistance and the fulcrum

Occupational Therapy (21 decks)

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