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Flashcards in Friction Deck (23):
1

Friction?

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

-result of contact with irregular forces

2

Static friction

force which must be overcome to start an object moving

3

kinetic friction

force which must be overcome to keep an object moving

4

Static friction value

Static friction is greater than kinetic friction

5

Coefficient of Friction

Unit: μ (Mu)

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

6

What causes the coefficient of friction to change?

it changes depending on the surface

7

Unit of coefficient of friction

UNITLESS

8

Frictional force formula

Ff = μFn

9

Relationship between Ff and surface area?

Ff does NOT depend on surface area

10

What does Ff depend on?

The mass

11

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

Fn=Fg

12

What is Fn

force of surface back up on the object

13

What is Fnet?

what provides an acceleration

(How much they're winning by)

To calculate, subtract the two forces

14

How to calculate coeff of friction?

Ff/ Fn

15

Newton's second law

a= Fnet/m

16

Normal force are always directed

perpendicular to the surface

17

At rest what is the relationship between Ff and FgII

Ff= FgII

18

Force due to gravity is always

M*G =Weight

19

Mass is always ...

the same on earth or in space

20

Formula of Fg II

Fg sin Θ

21

Formula of Fg ⊥

Fg cos Θ

22

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

FgII = Fnet

23

As Θ increases on a frictionless surface...

FgII increases, so Fnet increases and the object accelerates faster