Friction

Question 1

Static Friction

Answer 1

Acts on a stationary object and prevents motion (Fs). It is a max value that can be applied by surface + content.

Question 2

Kinetic Friction

Answer 2

Acts to oppose the motion of a moving object (Fk). Typically lower than static friction. Once an object gets moving it takes less force to keep it moving. Ff depends on Fn and surfaces in contact.

Question 3

Coefficient of Friction

Answer 3

The ratio of magnitude Ff to magnitude Fn. Formulas: μ=Ff/Fn, μ=Fs/Fn, μ=Fk/Fn. μ typically between 0 and 1.

Question 4

What is friction?

Answer 4

The force which acts on 2 objects in contact to oppose the motion or prevent it. Two types: Static and Kinetic.