Construct free-body diagrams for the following physical situations at the instant in time for which they are described. As is always done in free-body diagrams, label the forces according to type and draw the arrows such that their length reflects the magnitude of the force.

1.A book is at rest on top of a table.

2.A book is being pushed to the right across a table surface with a constant velocity. (Neglect Fair.)

3.A book is being pushed to the right across a table surface and accelerating in the direction of the push. (Neglect Fair.)

4.A student is pushing lightly upon a large box in an attempt to push it to the right across the floor, but the box fails to move

5.A rightward-moving box (which was previously set into rightward motion across the floor) gradually slows to a stop.

6.An air track glider is gliding to the right at constant velocity.

7.A ball is dropped from rest from the top of a building. (Neglect Fair.)

8.Several seconds after being thrown, a football is moving upwards and rightwards towards the peak of its trajectory. (Neglect Fair.)

9.Several seconds after being thrown, a football reaches the precise peak of its trajectory. (Neglect Fair.)

10.A falling skydiver is speeding up.

11.A falling skydiver has reached a terminal velocity.

12.After reaching a terminal velocity, a falling skydiver has opened her parachute.

13.A car is moving to the right at a high speed across a level roadway surface; the driver's foot remains on the gas pedal.

14.A car is skidding to a stop (with wheels locked) while traveling to the right across a level roadway surface.

15.An elevator (held by a cable) is moving upwards at a constant velocity. (Neglect Fair.)

16.An upward moving elevator (held by a cable) slows down. (Neglect Fair.)

17.A downward moving elevator (held by a cable) slows down. (Neglect Fair.)

18.A picture hangs symmetrically by two wires oriented at angles to the vertical.