Friction

Question 1

How do you draw a graph for friction?

Answer 1

Fweight is down
Fnormal is up
F is right
Fstatic-friction is left

Question 2

What is the direction of frictional force?

Answer 2

Opposite of relative motion

Question 3

What is the coefficient of friction?

Answer 3

Roughness of surfaces

Question 4

What is normal force?

Answer 4

Magnitude of force pushing down’s reverse (or opposite of Fweight)

Question 5

What is static friction?

Answer 5

Resisting with no motion

Question 6

What is kinetic friction?

Answer 6

Resisting as an object moves

Question 7

Make an equation using the following:
μ, F, N

Answer 7

F = μN
F-friction = μ * Normal force

Question 8

Make an equation using the following:
N, μs, Fs

Answer 8

Fs <= μsN
Static friction <= μ * Normal force

Question 9

What is μ?

Answer 9

The coefficient on the reference tables

Question 10

What is Fs <= μsN used for?

Answer 10

Find the maximum static force

Question 11

What type of force do cars use and why?

Answer 11

Static
The wheels do not move relative to the ground

Question 12

What is the formula for kinetic friction?

Answer 12

fk = μkFn

Question 13

If an object moves at constant velocity, what is the net force?

Answer 13

0 m/s

Question 14

Make an equation using the following:
Ffriction, Fnet, Fapplied

Answer 14

Fnet = Fapplied - Ffriction