Friction HANDS OFF THE RAMPS!!!!

The Source of Friction Close contact of two objects increases friction The rougher the surface, the more friction Every surface has microscopic bumps that create friction These are sometimes known as hills and valleys

What are the types of friction? Kinetic Friction – when a force is applied to an object, the object moves. Sliding Friction Rolling Friction Fluid Friction Static Friction - a force is applied to an object, but does not cause the object to move.

How Can We Reduce Friction? We can use a lubricant to reduce friction. A lubricant makes the surfaces slipperier or smoother, so the object moves more easily. Wax Motor oil (or regular oil) Grease Water

How Can We Increase Friction? You can increase the force you are putting on an object You can rub two rough surfaces against each other. Such as: using sandpaper Wearing textured gloves (so a baseball bat doesn’t fly out of your hands) Using a sponge with a scrubber to fight against food particles on dishes

Activity: Surface Penny Observations Car Observations

Friction Ramps Copy Paper Laminate (clear plastic) Duct Tape Wax Paper Sand Paper Purple Fabric Crumpled Tin Foil Cardboard Carpet Bubble Wrap Fuzzy Fabric

Activity: You need a piece of lined paper. Fold the paper into thirds (portrait) and label it as shown: