Question

Answer these multiple choice questions about the forces in the Lazy Susan problem.

(a) Which is stronger force, the force on the turntable by the saltshaker or the force on the saltshaker by the turntable?

The two forces are equally strong by Newton's First Law.The two forces are equally strong by Newton's Third Law.     The force on the turntable by the saltshaker is stronger.The force on the saltshaker by the turntable is stronger.

(b) What is the direction of the net force on the saltshaker?

Somewhere between downward and radially outward.Somewhere between downward and radially inward.     The saltshaker is moving at constant speed, so the net force on the saltshaker is zero.Purely downward.Purely radially outward (i.e. away from the center of the turntable).Purely radially inward (i.e. towards the center of the turntable).Purely upward.

(c) What is the direction of the force on the saltshaker by the turntable? HINT: Look at your force diagram before trying to answer.

Purely downward.Somewhere between upward and radially inward.     Somewhere between upward and radially outward.Purely radially outward (i.e. away from the center of the turntable).Purely radially inward (i.e. towards the center of the turntable).Purely upward.

(d) What is the direction of the force on the turntable by the saltshaker?

Purely radially outward (i.e. away from the center of the turntable).Purely upward.     Purely radially inward (i.e. towards the center of the turntable).Purely downward.Somewhere between downward and radially inward.Somewhere between downward and radially outward.

(e) What kind of force is the force on the saltshaker by the turntable?

A gravitational force.An electromagnetic force.     A nuclear force.

Answer 1