Multiple Choice 1. ) What does it mean if object 1 does +10J of work on objeft 2
ID: 1372565 • Letter: M
Question
Multiple Choice
1. ) What does it mean if object 1 does +10J of work on objeft 2?
(a) Object 1 exerts a 10-N force on object 2 in the direction of its 1-m displacement
(b) Object 1 exerts a 1-N force on object 2 in the direction of its 10-m displacement
(d) All of the above
(e) None of the above
2.) Imagine that you stretch a spring 3 cm, and then another 3 cm. Do you do more, less, or the same amount of work stretching it the second 3cm compared with the first?
(a) The same work
(b) Less work
(c) More work
3.) Two identical stones, A and B, are thrown from a cliff from the same height and with the same initial speed. Stone A is thrown vertically upward, and stone B is thrown vertically downward. Which of the following statements best explains which stone has a larger speed just before it hits the ground, assuming no effects of air friction?
(a) Both stones have the same speed; they have the same change in Ug and the same Ki.
(b) A, because it travels a longer path
(c) A, because it takes a longer time interval.
(d) A, because it travels a longer path and takes a longer time interval.
(e) B, because no work is done against gravity.
Explanation / Answer
1) d
2) a
3) a
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