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South College Therapeutic Interventions > Week 2- Levers and Mechanical Advantage > Flashcards

Week 2- Levers and Mechanical Advantage Flashcards

1
Q

Lever

A

A simple machine consisting of a rigid rod suspended across a pivot point or axis

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2
Q

Lever system

A

when two forces are applied to a lever in a way that produces opposing torques

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3
Q

Moment Arm

A

distance from the Axis (Fulcrum) to the location of force

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4
Q

Components of a lever

A
  • Effort Force (EF)
  • Resistance Force (RF)
  • Effort Arm (EA)
  • Resistance Arm (RA)
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5
Q

Effort Force (EF)

A

Force producing the resultant torque

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6
Q

Resistance Force (RF)

A

Force creating an opposing torque

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7
Q

Effort Arm (EA)

A

Moment Arm (distance from axis to location on force) of the effort force

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8
Q

Resistance Arm (RA)

A

Moment Arm for the resistance force

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9
Q

Classes of levers

A
  • Class 1
  • Class 2
  • Class 3
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10
Q

Class 1 Lever

A

Fulcrum is between effort force and resistance force

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11
Q

Class 2 Lever

A

The resistance force is between the fulcrum and the effort force

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12
Q

Class 3 Lever

A

The effort force is between the fulcrum and the resistance force

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13
Q

Mechanical Advantage

A
  • Measure of mechanical efficiency of a lever system

- MA = EA/RA

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14
Q

Mechanical advantage of a Class 1 Lever

A

Mechanical advantage can

vary

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15
Q

Mechanical advantage of a Class 2 Lever

A

Mechanical advantage

greater than 1

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16
Q

Mechanical advantage of a Class 3 Lever

A

Mechanical advantage less

than 1

17
Q

What happens to the class of a lever when the exercise is closed chain vs open chain?

A

It can change depending on if its open or closed chain

18
Q

Limitations of lever systems in the body

A
  • Ignore the fact that rotation of a level requires at least one force couple to help stabilize the at least on part of the lever system
  • Torques on the human body are not simply produced by muscle and external forces
19
Q

Factors that can maximize torque

A
  • Increase the magnitude of the force
  • Applying the force perpendicular to the lever
  • Increasing the distance of the point of application of the force from the joint axis

South College Therapeutic Interventions (23 decks)

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