# Types of Friction

A Coaster Sliding Against a Table

In a nutshell, static friction is the force required to overcome the stickiness of a body that is not moving and kinetic friction or sliding friction is the force resisting motion once the body starts to move. So any relative motion of two bodies touching each other is an example of sliding fiction.

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image: grc.nasa.gov
A Sled Sliding Across Snow or ice

Examples: Slides, Rubbing both hands together to create heat, A sled sliding across snow or ice, etc. Rolling Friction A friction force that acts on rolling objects, caused by the change in shape at the point of rolling contact. Examples: Shape of wheel, The type of surface on which the wheel is rolling, etc.

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A Washing Machine Pushed Along a Floor

Here is my problem, A washing machine has a weight of 975 N. It requires a minimum force of 350 N to move it along a tile floor. What is the coefficient of static friction between the washing machine and the tile floor?

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Rubbing Both Hands Together to Create Heat

Friction causes the hands to warm up when rubbed together. The greater the amount of friction between two objects is, the more heat is generated. Friction is a force, and it tries to prevent objects from moving. Friction has benefits as well as negative consequences.

source: reference.com
Skis Sliding Against Snow

The coefficient of friction is a dimensionless quantity that quantifies the amount of friction between two surfaces. The symbol for coefficient of friction is μ (mu) and is defined as follows: μ = ƒ /N. Where. ƒ is the friction force and N is the normal force between the two surfaces in contact.