Friction Friction is a force which acts on surfaces that rub together. Examples Rubber tyres on a road Air resistance on a parachute Climbing shoes on.

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Presentation transcript:

Friction Friction is a force which acts on surfaces that rub together. Examples Rubber tyres on a road Air resistance on a parachute Climbing shoes on a rock face Training shoes on the gym floor

Friction slows down moving objects. Friction changes movement (kinetic) energy into heat.

Measuring Friction Method Measure the force required to make the block move.

Results Block Surface MaterialForce to make block move on worktop (N) Force to make block move on floor (N) wood rubber paper Smooth sandpaper Rough sandpaper

Conclusion The amount of force needed to move an object depends on the material of the surfaces. The ___________ generates more friction than the ______________.

Problems p Watch the teacher demonstration on friction

Homework for Tues 1 Sept Physics: Find out what is the fastest car ever and about its design.