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# August friction

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```									October 21
physics
In:
What do
you think
affects
the force
of
friction?
Objective:

 To  build an understanding
of the force of friction.
Success criteria:
 Understand the variables
that make up friction.
Discovery Lab:
Force of friction
    List the possible variables that make up
the force of friction
    Using the force probe and friction block,
test each variable.
    Data:
1. Variable 1:
a)   How are you testing it
2. Variable 2 :
….Etc…
What did we find out:
Force of friction

   Static Force of Friction
– Force needed to start 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
Mass=32 kg
µs = .7
µk = .3
Find the force to get
the box moving.
Find the force to keep
the box moving at a
constant velocity.
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
along a slip-n-slide.
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
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:

   Draw a free body diagram of your
friction block in constant velocity.

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