Suppose you have a 126-kg wooden crate resting on a wood floor. , = 0.3 and u = 0.5) (a) What maximum force (in N) can you exert horizontally on the crate without moving it? (b) If you continue to exert this force (in m/s2) once the crate starts to slip, what will the magnitude of its acceleration then be? m/s2

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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!