Shows a summation of forces keeping a cart at equilibrium. The
inclined plane is at 30 degrees and the cart has mass 1kg. Masses
on pulleys mimic the normal force of the plane and the static
friction that would be needed to keep the cart from sliding down
the plane. The cart floats a little above the plane, so once the
incline is removed, the cart stays at rest because the sum of
forces is zero. Normal force is mimicked by an 866g mass on a
string perpendicular to the plane, static friction is mimicekd by
a 500g mass hanging from a string tangent to the plane.
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