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Unformatted text preview: October 4
October 4 physics In:
What is the difference between the static and kinetic force of friction? Force of friction
Force of friction Static Force of Friction – Force needed to get an object moving Kinetic Force of Friction – Force needed to keep an object moving Ff=µFn
Force of static friction uses µstatic – The force it takes to get something moving Force of kinetic friction uses µkinetic – The force it takes to keep it going at a constant velocity Objective:
Objective: To build an understanding of the force of friction.
Success criteria: Solve friction problems using Ff Fn and μ The Mu that you Do…
The Mu that you Do… A 700 kg polar bear A 700 kg polar bear slides across the ice with a force of friction of 25 N. What is the coefficient of friction between fur and ice? A 25 kg boy slides A 25 kg boy slides along a slipnslide. He slows down with an acceleration of .5 m/s2. What is µk between the slide and the boy? A group of people pull a 200,000 kg A group of people pull a 200,000 kg plane with a force of 40,000 N to keep it moving at a constant velocity. What is the kinetic force of friction? What is the coefficient of kinetic friction of the tires on the tarmack? Out: A 200 kg lion is pulled at a A 200 kg lion is pulled at a constant velocity with a force of 300 N. What is the coefficient of kinetic friction between paws and ground? ...
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