91Ó°ÊÓ

FIGURE EX5.14 shows the acceleration of objects of different mass that experience the same force. What is the magnitude of the force?

Figure shows an object’s acceleration-versus-force graph. What is the object’s mass?

FIGURE Q5.15 shows a hollow tube forming three-quarters of a circle. It is lying flat on a table. A ball is shot through the tube at high speed. As the ball emerges from the other end, does it follow path A, path B, or path C ? Explain.

Which, if either, of the basketballs in FIGURE Q5.16 are equilibrium? Explain.

Figure 5.16

17. Which of the following are inertial reference frames? Explain.

a. A car driving at steady speed on a straight and level road.

b. A car driving at steady speed up a 10° incline.

c. A car speeding up after leaving a stop sign.

d. A car driving at steady speed around a curve.

Exercises 18 show two of the three forces acting on an object in equilibrium. Redraw the diagram, showing all three forces. Label the third force $\stackrel{→}{F_3}$.

Exercise 19 show two of the three forces acting on an object in equilibrium. Redraw the diagram, showing all three forces. Label the third force $\stackrel{→}{F_3}$.

A chandelier hangs from a chain in the middle of a dining

room. Identify the forces on the chandelier.

A compressed spring is pushing a block across a rough horizontal table. How many force vectors would be shown on a free-body diagram? Name them.

Exercises 22 show a free-body diagram. Write a short description of a real object for which this would be the correct free-body diagram. Use Examples 5.4, 5.5, and 5.6 as examples of what a description should be like.