Three people pull simultaneously on a stubborn donkey. Jack pulls directly ahead of the donkey with a force of 62.3 N, Jill pulls with 71.5 N in a direction 45° to the left, and Jane pulls in a direction 45° to the right with 103 N. (Since the donkey is involved with such uncoordinated people, who can blame it for being stubborn?) Determine the magnitude F of the net force the people exert on the donkey. What is the direction 8 of the net force? Let 0° define straight F = N

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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!