In the World's Strongman competition there is a deadlift event where a constant must raise a heavy crate. Use the diagram to determine how much force must be applied to lift a 3000 lb crate,  According to the diagram, the pivot is located 3 feet away from the crate, on the left side of the plank. The whole plank measures 15 feet long.  Pivot = x X_________________I     CRATE     I_____________________________________________  <-----3 ft ------>            Fw  (going down, from crate                                 ^ <------------------------------------------------ 15 ft ----------------------->F (going up)

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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!