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Why the friction can be smaller than the force? What determines the friction? And how does a disk rotating on a horizontal surface with friction come to terminal when it rotates without slipping and static force does not turn the kinetic energy into heat?

There is no information about energy in the question offered in An Introduction To Mechanis by Kleppner.

Homework Statement A horizontal force is exerted on a uniform disk towards the center of mass resting on a horizontal table. The surface has friction. How does the disk begin to move ? Because when the force increases from zero, at first the friction is static friction which means the net...

Homework Statement A marble of mass M and radius R is rolled up a plane of angular θ. If the initial velocity of the marble is v, what is the distance l it travels up the plane before it begins to roll back down? Homework Equations The Attempt at a Solution I would like to know...

Homework Statement Why it is the antinode at the open end? Homework Equations The Attempt at a Solution