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A free-body diagram is a sketch showing an object and all of the forces being exerted on it. Always draw a free-body diagram when you are analyzing forces.
In both cases above, mg and N are equal in magnitude and opposite in direction. Are these the equal-and-opposite forces discussed in Newton's Third Law?
Neither, explain below
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What is the mass of the glider on the air track, if the hanging weight has mass of 20
grams? Friction is negligible. (Use the positions, given in meters, shown next to the
glider and weight. Time is given in seconds.)
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