Frictional Forces
Key points
- Oppose the direction of a body
- The area of contact between two surfaces doesn’t affect the magnitude of the frictional forces
Frictional Forces exist when there exists a contact force between two objects.
- Frictional Forces generally oppose the motion of a body
- The area of contact between two surfaces doesn’t affect the magnitude or direction of the frictional force
Formula Booklet
Dynamic Friction = one body slides over another
- Dynamic Friction does not depend on the speed of sliding
- R = normal reaction force
- μd = coefficient of dynamic friction
- Acceleration is a vector quantity
Static Friction = a body wants to move but can’t due to the opposite force of static friction
- R = normal reaction force
- μs = coefficient of static friction
- μs > μd
Formula Booklet
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