Recognize that energy can be transferred from one system to another when two objects push or pull on each other over a distance (work) and electrical circuits require a complete loop through which an electrical current can pass.
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Q 1/5
Score 0
Four students volunteered to help a librarian move containers of library materials. The graph shows the amount of force used to lift the containers. The numbers in the bars show the mass of each container. The results for each student helper are shown in the table. Based on this information, which student helper did not do any work on a container?
60
Helper Y
Helper W
Helper X
Helper Z
Q 2/5
Score 0
An athlete is trying to lift some weights. He successfully lifts 200 N weights, but when he tries to lift 400 N weights, he is unsuccessful. Which of these correctly compares the amount of work the athlete does on the weights?
60
The athlete does no work on the 200 N weights but does work on the 400 N weights.
The athlete does work on both the 200 N weights and the 400 N weights.
The athlete does no work on either the 200 N weights or the 400 N weights
The athlete does work on the 200 N weights but does no work on the 400 N weights.
5 questions
Q.
Four students volunteered to help a librarian move containers of library materials. The graph shows the amount of force used to lift the containers. The numbers in the bars show the mass of each container. The results for each student helper are shown in the table. Based on this information, which student helper did not do any work on a container?
1
60 sec
7.P.2.3
Q.
An athlete is trying to lift some weights. He successfully lifts 200 N weights, but when he tries to lift 400 N weights, he is unsuccessful. Which of these correctly compares the amount of work the athlete does on the weights?
2
60 sec
7.P.2.3
Q.
A clerk at a hardware store performed the activities in the list. Which statement best describes the amount of work performed for the three activities?
3
60 sec
7.P.2.3
Q.
The diagram of Situation 1 shows one person failing to move a refrigerator up a ramp, while the diagram of Situation 2 shows two people successfully pushing a refrigerator up a ramp. What comparison can be made about the work done in the two situations?
4
60 sec
7.P.2.3
Q.
Two boxes and their masses are shown below. Which of the following situations shows work being done?
