L3;3,7,13 Flashcards

1
Q

What is force? (The two definitions)

A

Force is a push or pull by one object onto the other

Force can change motion and or deform objects

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2
Q

What are the three factors that categorize force?

A
  1. Magnitude (M)
  2. Direction (D)
  3. Point of application
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3
Q

Force is a ______ quality

A

Vector

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4
Q

Bigger moment arm ______

Smaller moment arm _______

A

Slower, faster

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5
Q

If a torque is going clockwise, what direction is its vector?
If a torque is going counter clockwise, what direction is its vector?

A

Negative

Positive

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6
Q

What is torque?

A

This is the turning effect of a force

Torque is a vector (has magnitude and direction) and represented as curved arrows.

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7
Q

What is the formula for torque?

A

T= F x dt [NxM]

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8
Q

What is a moment arm?

A

This is the perpendicular distance between the force line of action and fulcrum.

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9
Q

What is static equilibrium?

A

If there is no resultant force or torque acting on an object, the object will not change.

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10
Q

What is a

Resultant force
Resultant torque

A

Resultant force= sum of all forces acting on an object

Resultant torque= sum of all torques acting on an object

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11
Q

What is the difference between mass and weight?

A

Mass=quantity of matter contained in an object

Weight= gravitational force that the earth exerts on a body

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12
Q

It is easier to initiate rotation when force is applied ________ and as _______ as possible from/to the fulcrum

A

Perpendicularly, far

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13
Q

Five characteristics that force generation is affected by

A
  1. Muscle length
  2. Cross sections area
  3. Moment arm
  4. Angle of attachment
  5. shortening velocity
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