Forces stick-block. In the figure below, a 37 kg block is pushed across a frictionless floor by means of a 3.8 kg stick. The block moves from rest through distance d = 73 cm in 1.5 s at constant acceleration. (a) Identify all horizontal third-law force pairs. (b) What is the magnitude of the force on the stick from the hand? (c) What is the magnitude of the force on the block from the stick? (d) What is the magnitude of the net force on the stick? (a) (b) Number FHS (d) Number SB = FI HB (c) Number i = = FSH (hand and stick) FBS (stick and block) F BH (hand and block) Units Units Units m M -Frictionless surface

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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!