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EXCI 351 Final Exam > Torque and Center of Gravity > Flashcards

Torque and Center of Gravity Flashcards

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

A

T=Fd

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

A

Positive

21
Q

If a torque causes clockwise rotation what sign will it be

A

Negative

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?

A

True

25
Q

Why is it possible to jump higher with only open hand reaching overhead?

A

Because the COG in the body is lower

26
Q

Why could one high jumper jump higher than another with the same stature and same athletic ability?

A

Because of better technique

EXCI 351 Final Exam (8 decks)

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