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physical aspects

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A 600 lb. oak packing crate is sitting on a cross grained, 14 ft long, oak ramp.
The force of the box against the ramp is
520 lbs, and the downhill force on the box
is 300 lbs.
Will the box slide down the hill all by itself?
Give the box a nudge, will it stop?
If the box will slide down the hill by
itself, what will be the acceleration on
the box?
Two big guys push on the box with a combined force of 300 lbs. How long will
it take for them to push the box down the ramp?
The two guys push the wrong box down the hill, and have to push it back up.
How much force does it take to get the box moving?
How much to keep it moving?

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