Description : A sled is pulled along a horizontal surface by a force that can be angled up from the horizontal. There is friction between the sled and the ground, and the two coefficients can be changed. Change the values below, then click the UPDATE CONDITIONS button - then PLAY.

**Some possible investigations:** (There are many possible solutions
to these, depending on the values.)

A) For a given kinetic coefficient of friction, and a fixed pulling
force magnitude (assuming it is enough to pull the block free and have it
accelerate) - what happens to the a_{x} as you change the angle?

B) In the above conditions, can you find the best angle, to get the
maximum acceleration sideways (can you calculate that angle also)?
(Conceptually, why should there be a best angle? - think of what happens
to all the various forces as the angle increases .. as it decreases.)

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