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zIntroductory Physiotherapy Practice > Week 4 - Angular Kinematics, Levers and Torque > Flashcards

Week 4 - Angular Kinematics, Levers and Torque Flashcards

1
Q

Linear velocity formula

A

change in displacement/change in time

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2
Q

Angular velocity formula

A

change in angle/change in time

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3
Q

Linear acceleration formula

A

change in velocity/change in time

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4
Q

Angular acceleration formula

A

change in angular velocity/change in time

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5
Q

Linear displacement

A

change in linear position

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6
Q

Angular displacement

A

change in angular position

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7
Q

What is linear inertia?

A

a body will remain at rest or in constant motion unless acted upon by a net external force, resistance of a body to changes in its motion

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8
Q

What is angular inertia (moment of inertia)

A

resistance to angular motion

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9
Q

Angular inertia (moment of inertia) formula

A

moment of inertia = mass x radius of gyration

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10
Q

What is the radius of gyration?

A

how the mass is distributed with respect to the axis of rotation; distance from the axis to the COM

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11
Q

What is linear momentum?

A

quantity of motion possessed by a body

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12
Q

Linear momentum formula

A

mass x velocity

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13
Q

How is angular momentum changed?

A

change the impulse (force applied over a period of time)

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14
Q

What is impulse

A

force applied over a period of time, force x time

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15
Q

Impulse formula

A

force x time

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16
Q

What are the three types of levers in the body and an example for each?

A
  • lever systems (biceps brachii pulling on radius)
  • wheel and axle systems (rotator cuff muscles pulling on humerus)
  • pulley systems (patella)
17
Q

What is a lever?

A

a rigid structure hinged at one point with forces applied at another point

18
Q

What is a first class lever?

A

lever of balance, head balancing on spine, fulcrum in middle

19
Q

What is a second class lever?

A

lever of strength, standing on toes, resistance in the middle

20
Q

What is a third class lever?

A

lever of speed and ROM, bicep curls, effort in the middle

21
Q

What is mechanical advantage?

A
  • amount of one to overcome the other
  • based on distance (moment arm) forces are from fulcrum
  • length of effort arm vs length of resistance arm
22
Q

What is the formula for mechanical advantage?

A

effort arm/resistance arm

23
Q

What is torque?

A

turning effort produced by a force, force is applied away from COM/axis of rotation

24
Q

What is the formula for torque?

A

applied force x moment arm

zIntroductory Physiotherapy Practice (9 decks)

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