5
Friction
Teacher's Guide
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ward
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science
What effect does friction have on mechanisms? How is friction reduced?
Describe how the explanation of the cause of friction has changed over time.
Based on the laws of friction, what two factors do not affect the coefficient of friction? What two factors
are mainly responsible for the coefficient of friction?
Critical Thinking: Describe what might be happening when a door emits a high-pitched "squeaking"
noise when opened. What are some possible solutions to stop this noise?
Critical Thinking: Describe what is happening, in terms of normal force, limiting value, and coefficient of
friction, when an individual pushes a heavy box across a carpet as compared to pushing a light box across
the same floor.
