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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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the potential energy of two electric charges is inversely proportional to the distance between them. Two charges 30 nm apart have 1.0 J of potential energy. What is their potential energy if they are 20 nm apart?
Figure shows the acceleration of objects of different mass that experience the same force. What is the magnitude of the force?
An object experiencing a constant force accelerates at . What will the acceleration of this object be if
a. The force is halved? Explain.
b. The mass is halved?
c. The force is halved and the mass is halved?
A rubber ball bounces. We’d like to understand how the ball bounces. a. A rubber ball has been dropped and is bouncing off the floor. Draw a motion diagram of the ball during the brief time interval that it is in contact with the floor. Show 4 or 5 frames as the ball compresses, then another 4 or 5 frames as it expands. What is the direction of a u during each of these parts of the motion? b. Draw a picture of the ball in contact with the floor and identify all forces acting on the ball. c. Draw a free-body diagram of the ball during its contact with the ground. Is there a net force acting on the ball? If so, in which direction? d. Write a paragraph in which you describe what you learned from parts a to c and in which you answer the question: How does a ball bounce?
FIGURE EX5.13 shows an acceleration-versus-force graph for a object. What acceleration values go in the blanks on the vertical scale?
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