# A disc of mass m and radius r is rolling down a rough incline of the angle of inclination...

## Question:

A disc of mass m and radius r is rolling down a rough incline of the angle of inclination 30degrees. If there is no slipping, find the frictional force.

## No Sliding Friction Force:

When an object roll or in the case of an automobile, when tyres roll, they don't slide and it can be said that they are under influence of the static friction and all mechanical equations are written for the centre of mass.

## Answer and Explanation: 1

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Given:

• radius, {eq}r {/eq}
• mass, {eq}m {/eq}
• angle of inclination, {eq}\theta=30^{\circ} {/eq}

Equation of motion for the center of mass,

{eq}mg\...

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#### Learn more about this topic: Friction: Definition and Types

from

Chapter 7 / Lesson 5
39K

You experience friction all the time, and you should be glad you do! Friction helps keep stationary objects in place as well as slow moving objects down as they slide across a surface. This lesson identifies what friction is and explains the two ways we find this force on earth.