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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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Exercises 25 describe a situation. Identify all forces acting on the object and draw a free-body diagram of the object.
Your physics textbook is sliding across the table.
You toss a ball straight up in the air. Immediately after you let go of it, what force or forces are acting on the ball? For each force you name,
(a) state whether it is a contact force or a long-range force and
(b) identify the agent of the force.
Problems 35 through 40 show a free-body diagram. For each:
a. Identify the direction of the acceleration vector 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.
If an object is at rest, can you conclude that there are no forces acting on it? Explain.
Redraw the two motion diagrams shown in the FIGURE , then draw a vector
beside each one to show the direction of the net force acting on the object.
Explain your reasoning.
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