A sled of mass 50.0 kg is pulled along the flat, snow-covered ground. The static friction coefficient is 0.30, and the kinetic friction is 0.10. What does the sled weigh? What force will be needed to start the sled moving? What force is needed to keep the sled moving at a constant velocity?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!