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So Carlos, who has "tested" this Heather Elizabeth? As a previous poster has already mentioned James Randi, I'll just add that if she is so good, she should have no difficulties winning the Million Dollar Paranormal Challenge of the James Randi Educational Foundation. Please, if you are going...

Galileo "fooled" gravity by rolling objects from rest down inclined planes and timing their descent (with his pulse!). The advantage of this method (the inclined plane, not the pulse timing method) is that it slows the objects (balls?) down enough that the timing may be made accurately. A stop...

Since friction is a non-conservative force, the net work done by friction is the change in energy between the time the snowboarder was moving at 16m/s and the time when he came to rest. Potential energy may be ignored as the event takes place with no vertical displacement: W(friction) = ΔKE = 0...

F = -mg? Generally, the normal force is positive, because it acts upward, opposite of gravity (on a horizontal surface). For F = ma = -μmg, this is because the friction force (μmg) acts in the opposite direction of motion. That is from my answer to another of your questions, I guess I could...