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Physics > Friction > Flashcards

Friction Flashcards

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1
Q

Friction?

A

-a force that opposes motion
(acts in the opposite direction of motion)

-result of contact with irregular forces

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2
Q

Static friction

A

force which must be overcome to start an object moving

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3
Q

kinetic friction

A

force which must be overcome to keep an object moving

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4
Q

Static friction value

A

Static friction is greater than kinetic friction

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5
Q

Coefficient of Friction

A

Unit: μ (Mu)

-value defines as the ratio of frictional force to the normal force

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6
Q

What causes the coefficient of friction to change?

A

it changes depending on the surface

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7
Q

Unit of coefficient of friction

A

UNITLESS

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8
Q

Frictional force formula

A

Ff = μFn

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9
Q

Relationship between Ff and surface area?

A

Ff does NOT depend on surface area

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10
Q

What does Ff depend on?

A

The mass

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11
Q

On flat surfaces what is the relationship between Fn and Fg?

A

Fn=Fg

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12
Q

What is Fn

A

force of surface back up on the object

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13
Q

What is Fnet?

A

what provides an acceleration

(How much they’re winning by)

To calculate, subtract the two forces

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14
Q

How to calculate coeff of friction?

A

Ff/ Fn

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15
Q

Newton’s second law

A

a= Fnet/m

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16
Q

Normal force are always directed

A

perpendicular to the surface

17
Q

At rest what is the relationship between Ff and FgII

A

Ff= FgII

18
Q

Force due to gravity is always

A

M*G =Weight

19
Q

Mass is always …

A

the same on earth or in space

20
Q

Formula of Fg II

A

Fg sin Θ

21
Q

Formula of Fg ⊥

A

Fg cos Θ

22
Q

On a frictionless surface, what is the relationship between FgII and Fnet

A

FgII = Fnet

23
Q

As Θ increases on a frictionless surface…

A

FgII increases, so Fnet increases and the object accelerates faster

Physics (20 decks)

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