Origin of the coordinate system
Draw the force vectors with their tails at the origin of the coordinate system. The orientation of your vectors will be graded. The exact lengths of your vectors will not be graded but the relative length of one to the other will be graded.
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A block of ice of mass m slides down an incline that makes an angle θ = 28.6o with the horizontal. In trial 1 there is no friction; the block starts at rest and takes time t to reach the bottom of the incline. In trial 2 there is friction, a
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