Friction: Example by Jared Rovny, PhD

Name: Friction: Example
Uploaded: 2016-12-09
Duration: 8 min 51 s
Description: The lecture Friction: Example by Jared Rovny, PhD is from the course Force.

About the Lecture

The lecture Friction: Example by Jared Rovny, PhD is from the course Force.

Included Quiz Questions

A block of mass m is sliding at a positive constant acceleration down the plane with an incline of θ, a coefficient of static friction μ_s, and a coefficient of kinetic friction μ_k. Which expression represents the net force on the block?

mg sinθ - μ_k mg cosθ
mg cosθ - μk mg sinθ
mg sinθ - μ_s mg cosθ
mg sinθ + μ_k mg cosθ
mg cosθ - μ_s mg sInθ

A block of mass m is sitting motionless on a plane with an incline of θ, a coefficient of static friction of μ_s, and a coefficient of kinetic friction μ_k. Which statement is TRUE once the incline elevates and θ increases?

The maximum static friction force will decrease.
The coefficient of static friction μ_s will decrease.
The maximum force caused by kinetic friction μ_k will decrease.
The maximum force caused by kinetic friction μ_k will increase.
The maximum force caused by kinetic friction μ_s will increase.

Which statement best describes the acceleration of the block at the threshold of sliding down?

The acceleration of the block is zero at the threshold of sliding down. However, a tiny increase in the incline angle θ will increase the acceleration to a non-zero value.
The acceleration of the block is non-zero at the threshold of sliding down but negligible.
The acceleration of the block is zero at the threshold of sliding down in a way that even if the incline angle θ is varied by a small amount it will still remain zero.
The acceleration of the block is non-zero and non-negligible at the threshold of sliding down.
The acceleration of the block is zero at the threshold of sliding down. However, any decrease in the incline angle θ will increase the acceleration to a non-zero value.