Calculating Kinetic Friction
Learning Objective
I can calculate the force of kinetic friction using the coefficient of kinetic friction and the normal force.
Lesson Flow
Watch Video
Static and kinetic friction example | Forces and Newton's laws of motion | Physics | Khan Academy
Khan Academy
Guided Notes
Key concepts students will learn:
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The coefficient of static friction is the ratio between the budging force and the normal force, while the coefficient of kinetic friction applies when the object is moving.
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The normal force is equal to the gravitational field times the mass, which in this example is 49 Newtons.
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Once the block is moving, the net force is the applied force minus the force of kinetic friction, resulting in an acceleration of 14.61 m/s².
Practice
8 questions • Multiple choice & Short answer & True/false
Exit Ticket
“A 10 kg box slides across a wooden floor. The coefficient of kinetic friction between the box and the floor is 0.3. Calculate the force of kinetic friction acting on the box. Show your work.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
