Chapter 5: Q. 50 (page 130)
Your friend went for a loop-the-loop ride at the amusement
park. Her car is upside down at the top of the loop.
abcd
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Problems 42 through 52 describe a situation. For each, draw a motion diagram, a force-identification diagram, and a free-body diagram.
A spring-loaded gun shoots a plastic ball. The trigger has just
been pulled and the ball is starting to move down the barrel. The
barrel is horizontal.
Problems 35 through 40 show a free-body diagram. For each:
a. Identify the direction of the acceleration vector au and show it as a vector next to your diagram. Or, if appropriate, write
b. If possible, identify the direction of the velocity vector and show it as a labeled vector.
c. Write a short description of a real object for which this is the
correct free-body diagram. Use Examples 5.4, 5.5, and 5.6 as
models of what a description should be like.
A brick is falling from the roof of a three-story building. How many force vectors would be shown on a free-body diagram? Name them.
An object experiencing a constant force accelerates at . What will the acceleration of this object be if
a. The force is doubled? Explain.
b. The mass is doubled?
c. The force is doubled and the mass is doubled?
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.
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