# Friction Worksheet - DOC - DOC

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```					Friction Worksheet
Physical Science – Mr. Rita
Skeletal Notes – Fill in the blank from the lecture introducing Friction.

1. Friction is a force, but it is a known as an _____________________________
force. It is a force that acts when two surfaces contact each other. Friction acts
when two solid surfaces come in contact. Fluid friction acts when one of the
surfaces are a ______________ or a __________________. Examples of each
type are as follows:

Gas fluid friction is known as _________________________________

Liquid fluid friction is known as _______________________________

2. Friction comes in two types:
1. Static Friction - _____________________________________________
Examples are: ______________________________________________
_______________________________________________

2. Kinetic Friction - ___________________________________________
Examples are: ______________________________________________
_______________________________________________

Static friction is always __________________ kinetic friction (Think of pushing a car)
In order to get _______________ friction, you must overcome ______________ friction.

3. Friction is Fun!
Actually the equation to find friction is: F =  N
F is the Force ________________ to an object. Its units are ________________.
is the coefficient of friction. It is a number with ____ units.(more on this later)
N is the normal force that acts opposite of gravity. (it’s the same as ___________)

4. This thing called (pronounced as Mew, rhymes with New)
 is different for every _____ different surfaces. The more that two surfaces
stick together, the ________ the . If two surfaces slide easily, there is a __________ .

5. List the following from greatest value of  (4) to the smallest (1).

___Two sides of Velcro ___ metal on ice ___wood on wood ___ Human skin on asphalt

6. So if the object is sliding, you get a kinetic  or, k . If the object is not moving you
get static , or s.

```
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