Theory of Machine
A system in dynamic balance implies that

There will absolutely no wear of bearings
The system is also statically balanced
The system is critically damped
There is no critical speed in the system

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because the uniform velocity motion is a partial parabolic motion
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of difficulty in manufacturing cam profile
Because of loose contact of follower with cam surface

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Theory of Machine
Inertia force acts

Along the direction of acceleration force
None of the listed here
Perpendicular to the acceleration force
Opposite to the direction of acceleration force

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