1. A box that is resting on an inclined plane has what forces acting on it?

2. A crane is used to pick up a 50-m-long steel beam to place in a building. The beam is uniform, but the crane cable is placed 2 m off the center of the beam. How much vertical force must be placed on the guide rope to keep the beam level? The beam has a mass of 5 kg/m, and the guide rope is placed on the end of the shorter side of the beam.

3. A rope is strung between two cliffs. A mountain climber weighing 100 kg is halfway across the rope when the rope forms an angle of 10° with the horizontal. What is the tension in the rope?

4. What is a friction force and how does it act?

5. An object is supported by a spring attached to the ceiling. What are the forces acting on the object?

6. Three men are trying to position a heavy soda machine into a niche in a wall. Two men are pushing diagonally along the front of the machine. Where should the third man push so that the machine will move straight into the niche?

7. A helicopter is holding a 5,000-N bridge section 100 m over the spot where it is going to be placed, but the helicopter is slightly off. How much force must the spotter on the ground apply to the bridge section to move it 1 m into the proper position?

8. What is a friction force and how does it act?

9. An object is supported by a spring attached to the ceiling. What are the forces acting on the object?

10. A book is resting on a table. What forces are acting on the book?

11. A torque is:

12. A 5-kg baby carriage that is carrying a baby that weighs 5 kg rolls on all four wheels. The front wheels are 60 cm from the back wheels and 90 cm from the carriage handle. Assuming that the center of gravity for the baby and the carriage’s center is equidistant between the front and back wheels, what force must the mother apply to tip the carriage back to lift the front wheels?

13. Can a compressive force be carried by a rope?

14. A book is resting on a table. What forces are acting on the book?

15. A six-strand pulley is used to raise a load weighing 1,000 kg. What is the tension on the pulley cables?

16. A box that is resting on an inclined plane has what forces acting on it?

17. Three men are trying to position a heavy soda machine into a niche in a wall. Two men are pushing diagonally along the front of the machine. Where should the third man push so that the machine will move straight into the niche?

18. What defines a lever arm?

19. When is the normal force not equal to the weight of an object?

20. Newton published his laws of motion in what text?