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, **but you are not
shown the values of the coefficients - you will have to figure them out**!
Change the values below, then click the UPDATE CONDITIONS button - then
PLAY.

**Some possible investigations:**

A) Set the pulling angle to zero to help you calculate the frictional
forces.

B) What is the connection between the frictional force and the
horizontal component of the pulling force if there is no motion sideways?
(Set the angle to zero, try stronger and stronger horizontal forces -
watch the frictional force vector)

C) What happens to the frictional force vector when you break the
sled free and it can move (compare just before it moves to just after it
moves).

D) If your pulling force is strong enough to get the block to move ..
can you make measurements/calculations to find the kinetic coefficient of
friction? (What other piece of information do you get if the block is
moving?)

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