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# Friction

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### Friction

1. 1. Newton’s first law of motion: Friction<br />8SCIENCE<br />
2. 2. Types of friction<br />What is friction?<br />Unbalanced force that slows objects down<br />Important to understand to use Newton’s laws as friction in almost all real-life situations<br />Types of friction:<br />Static friction<br />Sliding friction<br />Rolling friction<br />Air resistance<br />
3. 3. Static friction<br />Friction prevents an object from moving when force is applied<br />Tries to keep an object at rest<br />Ex: walking<br />Every step you take pushes against the Earth<br />Without friction, you would slip and fall with each step<br />What happens when the net force is greater then the force of static friction?<br />
4. 4. Sliding friction<br />Slows down an object that slides<br />Ex: if you push a box across the room, there is sliding friction between the bottom of the box and the floor<br />Ex: Rubbing hands , shuffling shoes<br />
5. 5. Types of Friction<br />ROLLING FRICTION<br />Allows wheels to turn by pushing back so tire moves forwards<br />Ex: bicycle, car<br />Ex: when you ride your bike through water, there may not be enough friction between the tire and the ground to move forward, and so the bike skids (slides off balance) <br />AIR RESISTANCE<br />Air pushes against you<br />Acts on the forward-moving part an object<br />Ex: front of a car<br />Ex: when you ride the bicycle, the air pushes the your hair and clothes back<br />