A hockey puck is set in motion across a frozen pond.If ice friction and air resistance are neglected,the force required to keep the puck sliding at constant velocity is
A)zero.
B)equal to its weight.
C)equal to its weight divided by its mass.
D)equal to the product of its mass times its weight.

Question

Quizplus · Accepted Answer

If ice friction and air resistance are neglected, there is no external force acting on the puck once it has been set in motion. According to Newton's first law of motion, an object in motion will remain in motion with a constant velocity unless acted upon by an external force. Therefore, no force is required to keep the puck sliding at constant velocity.

A Hockey Puck Is Set in Motion Across a Frozen