1. Draw the free-body diagram of all the forces acting on a book sitting on a desk.

2. Draw the free-body diagram of all the forces acting on a person just as they jump out of an airplane (include air resistance - hint: think of the size of the forces).

3. An elevator and its contents have a combined mass of 6000 kg. It is suspended by a single cable. (Assume 4 significant digits.) (a) Draw a free-body diagram of the elevator. (b) What force must the cable exert on the elevator when it is at rest? (c) What force must the cable exert on the elevator when it is moving upward at 2.0 m/s2 ? (d) What force must the cable exert on the elevator when it is moving downward at 2.0 m/s? (e) If the cable snapped, what is the elevator's motion as it falls? Include a new free-body diagram2