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