#### Transcript Big Idea

```“Mu of the Shoe”
Friction
Curriculum
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Big Idea: All forces arise from the interactions between
different objects.
Concept: When two surfaces of objects are in contact with
each other, the force of friction between them depends on the
nature of the materials in contact and the normal force.
Competency: Construct a free body diagram indicating the
magnitude and direction of the forces on an object and use
information from the diagram to determine the motion of the
object.
PA Standard 3.2.10.B1: Analyze the relationships among the net
force acting on a body, the mass of the body, and the resulting
acceleration using Newton’s Second Law of Motion.
Goals
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Know that changing the surfaces
in contact, will change the
coefficient of friction between the
surfaces.
Find the coefficient of friction
between two surfaces.
Compare surfaces based on their
coefficients of friction.
Today’s Honors Agenda
Opener: What is center of mass? How would a football player
react differently when you push him at his center of mass
versus when you push or pull on his legs?
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Unit 1.6: Mu of the Shoe Activity
1. What Do You Think?
2. Tug of War Challenge
3. Mu of the Shoe Experiment
4. Closure: What is the ONLY factor that affects the
COEFFICIENT OF FRICTION?
What 2 factors affect the FORCE of friction?
Take Home Assignment: Friction Problems (see handout)
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Opener: What is center of mass? How would a football player
react differently when you push him at his center of mass
versus when you push or pull on his legs?
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Unit 1.6: Mu of the Shoe Activity
1. What Do You Think?
2. Tug of War Challenge
3. Read Physics Talk as a class.
4. Closure: What is the ONLY factor that affects the
COEFFICIENT OF FRICTION?
What 2 factors affect the FORCE of friction?
Academic Take Home Assignment: Friction Reflection in packet.
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