Mechanical Engineering - Engineering Mechanics - Discussion

Here surface is smooth so how it can roll?

In motor cycles, which type of chains are used?

In case of pure rolling, there is no friction hence unstable.

Surface is smooth so no friction, due to no friction no force apply on the cylinder to stop rolling, it's continuous rolling inside the convex surface.

It should be neutral equilibrium. Equilibrium has three types: stable, unstable and neutral. Stable equilibrium is the condition when a small disturbance is given it try to come into the original position.

In case of unstable equilibrium object will never come into equilibrium position when given a small disturbance. Neutral equilibrium is the condition when object comes to a new equilibrium condition when given a small disturbance. This is is the third case.

Why is not in stable?

As the surface is smooth so there is not the friction, hence unstable.

At the convex surface though it is a smooth body tends to slides. Hence, unstable.

1. An equilibrium is considered stable if the system returns to it after small disturbances.

2. If the system moves away from the equilibrium after small disturbances, then the equilibrium is unstable, and.

3. The neutral equilibrium is that when moved slightly, it neither tends to return to its former position not depart more widely from it.

So 2nd option best fits, :).

@Manali.

If force is zero then by 1st law of newtons, it will remain stationary or in motion until unless applied any external force on it so due to this it must be in stable position.

Or one reason more, force is zero then it will be in equilibrium because if we will consider all forces then it should be in equal and opposite hence it also must be in stable position.