M Friction.

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Presentation transcript:

m Friction

In this chapter we focus on the physics of: 1- Frictional force In this chapter we focus on the physics of: 1- Frictional force. 2- Centripetal force.

No motion, : is the static friction Constant velocity Acceleration, : is the kinetic friction

Frictional force Static frictional force: Kinetic frictional force:

They are dimensionless. Remember: They are dimensionless.

What is the acceleration of the block?

A particle is in uniform circular motion if it travels around a circle or circular arc at constant speed. Centripetal acceleration - magnitude - direction: toward the center. According to Newton’s second law: The cause of the centripetal acceleration is a Force called the centripetal Force - direction: toward the center.

T Friction Force is the centripetal force Tension Force is the centripetal force Fg Gravity Force is the centripetal force