In the following, for each part, you may want to draw a free body diagram to aid in your solution. a) A crate of mass 10.0 kg is being pulled along a horizontal smooth floor by a horizontal force of 50.0 N. What is the acceleration of the crate? (6 pts) b) The crate now hits a rough patch so that it experiences a frictional force. If the coefficient of kinetic friction between the crate and the floor is 0.200, and the force remains at 50.0 N horizontally, what is the new acceleration of the crate? (8 pts) c) While being hauled along this rough floor, suppose the 50.0 N force is no longer horizontal, but is now being applied by pushing down at an angle of 300 below the horizontal. What is the acceleration in this case? (6 pts)

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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!