A carpenter holds a 16-lb 2-in. by 4-in. board as shown. If he exerts vertical forces on the board, determine the forces at A and B (use positive if the force is up and negative if down). A The number of significant digits is set to 3. The tolerance is ± 1 in the 3rd significant digit. NA = NB = i -24 B i 36 10' ! lb ! lb

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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!