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Chapter 4: Q3. (page 98)
If the object is moving, it is possible for the net force acting on it to be zero? Explain.
Yes, when the object is moving with a constant velocity, the net force on it must be zero.
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A stone hangs by a fine thread from the ceiling, and a section of the same thread dangles from the bottom of the stone (Fig. 4鈥�36). If a person gives a sharp pull on the dangling thread, where is the thread likely to break: below the stone or above it? What if the person gives a slow and steady pull? Explain your answers.
FIGURE 4-36 Question 9
Sketch the free-body diagram of a baseball (a) at the moment it is hit by the bat, and again (b) after it has left the bat and is flying toward the outfield. Ignore air resistance.
A 1280 kg car pulls a 350-kg trailer. The car exerts a horizontal force ofagainst the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.15 for the trailer.
Draw the free-body diagram for a basketball player (a) just before leaving the ground on a jump, and (b) while in the air. See Fig. 4鈥�46.
For the system of Fig. 4鈥�32 (Example 4鈥�20), how large a mass would box A have to have to prevent any motion from occurring? Assume.
FIGURE 4-32 Example 4鈥�20.
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