1) A box m1 = 9.30 kg is stacked on top of another box m2 = 20.0 kg, placed on the floor inside an elevator. When the elevator is accelerating downward with a magnitude of 3.72 m/s2, what is the normal force that box m1 exerts on box m2? What is the normal force that the elevator exerts on m2?
2) A force of magnitude F = 7.90 N pushes three boxes (from right to left) with masses m1 = 1.30 kg, m2 = 3.10 kg, and m3 = 4.70 kg, on a level surface. Find the contact force between boxes 1 and 2. Find the contact force between boxes 2 and 3. From right to left, Force F is pushing box1,box2,box3 attached together.
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