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Biomechanics 2241 > LECTURE #3 - force of friction > Flashcards

LECTURE #3 - force of friction Flashcards

1
Q

what is friction (mechanical behaviour of objects in contact) ?

A
  • force acting at interface of surfaces in contact
  • acts in a direction parallel to the area of contact
  • opposes the tendency to more
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2
Q

what is friction working against ?

A

action force

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3
Q

what does F(subscript A) =

A

action force

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4
Q

what does R(subscript N) =

A

Normal reaction force

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5
Q

what does F(subscript s) =

A

static friction force

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6
Q

what does F(subscript k) =

A

kinetic friction force

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7
Q

what does static mean ?

A

not moving

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8
Q

what does kinetic mean ?

A

,loving

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9
Q

what does F(subscript m) = ?

A

max static friction

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10
Q

what happens once static friction threshold is reached ?

A

it drops and starts

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11
Q

TRUE OR FALSE ?

friction is at a steady kinetic level

A

TRUE

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12
Q

what two things does friction force depend on ?

A

normal reaction force and coefficient of friction

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13
Q

what is normal force ?

A

force acting perpendicular to surface of object

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14
Q

what is tangential force ?

A

force acting parallel to surface object

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15
Q

what is coefficient of friction ?

A

indicated relative ease of sliding between two surfaces in contact (not describing a single surface)

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16
Q

what are some factors of friction ?

A
  • roughness & hardness of surfaces
  • type of molecular interaction of surfaces
17
Q

TRUE OR FALSE

static and kinetic values differ ?

A

TRUE

18
Q

what is kinetic friction ?

A

friction force generated between two surfaces in contact

19
Q

TRUE OR FALSE

remains constant F(subscript k) < F(subscript m)

A

TRUE

20
Q

FILL IN THE BLANK

friction force ________ depend on the surface area (contact area)

A

does not

21
Q

TRUE OR FALSE

typically, wider objects have greater weight

A

TRUE

22
Q

is it easier to pull or push?

A

pull

23
Q

when you pull you usually have an upward component of force so …
(increased of decreased)
the normal force is ___________ and therefore the friction force is _________

A

decreased

24
Q

when you push you usually have an downwards component of force so …
(increased of decreased)
the normal force is ___________ and therefore the friction fore is _________

A

increased

25
Q

is normal force parallel or perpendicular ?

A

perpendicular

26
Q

TRUE OR FALSE

applied force must exceed friction

A

TRUE

27
Q

TRUE OR FALSE

gravity pulls object down

A

TRUE

Biomechanics 2241 (21 decks)

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