Torque and Center of Gravity Flashcards

(26 cards)

1
Q

How should forces be applied if you are pushing someone by their shoulders

A

Perpendicular

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2
Q

T/F Systems rarely move in purely linear motion

A

True

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3
Q

In which two situations does rotation occur

A
  • When the system is restricted to move around a fixed axis
  • Around the center of gravity
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4
Q

What is the turning effect produced by?

A

Torque

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5
Q

In our body, what creates torque about our joints?

A

Our muscles

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6
Q

What is a centric force

A

A force going through the point of rotation

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7
Q

What is an eccentric force

A

A force that does not go through the point of rotation

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8
Q

Which type of force causes linear motion

A

Centric force

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9
Q

Which type of force creates rotation

A

Eccentric force

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10
Q

What is a force couple?

A

Two forces equal in size but opposite in direction and noncolinear

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11
Q

What is the resultant of a force couple?

A

Zero

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12
Q

T/F An eccentric force can cause changes in both linear and angular motion of an object

A

True

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13
Q

What type of force only causes a change in the angular motion of an object

A

A force couple

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14
Q

What two factors does torque depend on?

A
  • The magnitude of externally applied force
  • The force arm/ moment arm/ lever arm
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15
Q

What is the definition of a lever arm

A

The perpendicular distance between the axis of rotation and the line of action of the applied force

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16
Q

What is the equation for torque

17
Q

What does the moment arm change with?

A

The joint angle

18
Q

T/F The same force cannot produce different torques with a change in moment arm

A

False, the same force will produce different torques

19
Q

What is the direction of torque associated with?

A

With the rotation that it causes

20
Q

If a torque that causes counterclockwise rotation what sign will it be

21
Q

If a torque causes clockwise rotation what sign will it be

22
Q

What is net torque acting on an object the sum of

A

All external torques acting on it

23
Q

Define Center of Gravity

A

The point around which all of the torques sum to zero

24
Q

T/F It is possible to have the COG outside of the body?

25
Why is it possible to jump higher with only open hand reaching overhead?
Because the COG in the body is lower
26
Why could one high jumper jump higher than another with the same stature and same athletic ability?
Because of better technique