Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force and resultant couple are both equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant couple is equal to zero
Resultant force is equal to zero

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Theory of Machine
Cam angle is defined as the angle

Of rotation of the cam for a definite displacement of the follower
Through which, the cam rotates during the period in which the follower remains in the highest position
During which the follower returns to its initial position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

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