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Chapter 4: Q2CQ (page 159)
What properties do forces have that allow us to classify them as vectors?
The properties of forces that classify them as vectors are the magnitude and direction.
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Describe a situation in which one system exerts a force on another and, as a consequence, experiences a force that is equal in magnitude and opposite in direction. Which of Newton鈥檚 laws of motion apply?
If a constant, nonzero force is applied to an object, what can you say about the velocity and acceleration of the object?
A cartoon shows the toupee coming off the head of an elevator passenger when the elevator rapidly stops during an upward ride. Can this really happen without the person being tied to the floor of the elevator? Explain your answer.
Suppose your car was mired deeply in the mud, and you wanted to use the method illustrated in Figure 4.37 to pull it out.
(a) What force would you have to exert perpendicular to the center of the rope to produce a force of 12,000 N on the car if the angle is 2.00掳? In this part, explicitly show how you follow the steps in the Problem-Solving Strategy for Newton鈥檚 laws of motion.
(b) Real ropes stretch under such forces. What force would be exerted on the car if the angle increases to 7.00掳 and you still apply the force found in part (a) to its center?
Give a detailed example of how the exchange of a particle can result in an attractive force. (For example, consider one child pulling a toy out of the hands of another.)
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