Ch. 5 Check Your Understanding Flashcards
The speedometer of your car shows that you are traveling at a constant speed 35m/s. Is it possible that your car is accelerating?
Yes, if you are going around a curve
Consider two people, one on the earths surface at the equator and the other at the North Pole. Which has the larger centripetal acceleration?
The person at the equator
Which of the following statements about centripetal acceleration is true?
A) an object moving at a constant velocity cannot have a centripetal acceleration
B) an object moving at a constant speed may have a centripetal acceleration
A and B
A car is traveling in uniform circular motion on a section of road whose radius is r. The road is slippery, and the car is just on the verge of sliding. A) if the cars speed were doubled, what would be the smallest radius at which the car does not slide? Explain. B) what would be the answer to part A if the car were replaced by one that weighed twice as much, the cars speed still not being doubled?
4r
4r
Other things being equal, would it be easier to drive at high speed around an unbanked horizontal curve on the moon than to drive around the same curve in the earth?
No
What is the chance of a light car safely rounding an unbanked curve on an icy road as compared to that of a heavy car: worse, the same, or better? Assume that both cars have the same speed and are equipped with identical tires.
The same
A penny is placed on a rotating turntable. Where on the turntable does the penny require the largest centripetal force to remain in place: at the center of the turntable or at the edge of the turntable?
Edge of the turntable
Two cars are identical, except for the type of tread design on their tires. The cars are driven at the same speed and enter the same unbanked horizontal turn. Car A cannot negotiate the turn, but car B can. Which tread design, the one on car A or the one on car B, yields a larger coefficient on static friction between the tires and the road?
Car B
Two satellites are placed in orbit, one about mars and the other about Jupiter, such that the orbital speeds are the same. Mara has the smaller mass. Is the radius of the satellite in orbit about mars less than, greater than, or equal do the radius of the satellite orbiting Jupiter?
Less than
The acceleration due to gravity on the moon is one-sixth that in earth.
A) is the true weight of a person on the moon less than, greater to, or equal to the true weight of the same person on earth?
B) is the apparent weight of a person in orbit about the moon less than, greater than, or equal to the apparent weight of the same person in orbit about the earth?
A) less than
B) equal to
Would a change in the earths mass affect a) the banking of airplanes as they turn, b) the banking of roadbeds, c) the speeds with which satellites are put into circular orbits, and d) the performance of the loop-the-loop motorcycle stunt?
A) yes
B) yes
C) yes
D) yes
A stone is tied to a string and whirled around in a circle at a constant speed. Is the string more likely to break when the circle is horizontal or when it is vertical? Assume that the constant speed is the same in each case.
Vertical
