Warm up 9/14 Draw and Solve

Friction Force, resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other

Types of friction forces Friction is a force, measured in newtons just like any other force. Static friction keeps an object at rest from moving.

Kinetic friction is a force that resists the motion of an object moving across a surface.

Other types of friction

Friction is a force that opposes motion. Many kinds of friction exist.

Amount of friction depends on 2 things: 1. Type of surface 2. Amount of force

More force = More friction The greater the force squeezing two surfaces together, the greater the friction force. Try it with your hands

Surface Matters! Friction depends on both of the surfaces in contact. Just read: (When the hockey puck slides on ice, a thin layer of water between the rubber and the ice allows the puck to slide easily.)

Just Read! Friction is also important to anyone driving a car. Grooved tire treads allow space for water to be channeled away from the road-tire contact point, allowing for more friction in wet conditions.

Just keep reading Shoes are designed to increase the friction between their soles and the ground. Why do you think these shoes increase friction? Players wearing cleats can apply greater force against the ground to help them move and to keep from slipping.

Fire Bending OR...