Two students are investigating kinetic energy (energy of motion.)
The students laid two identical wooden planks (A and B) against a trunk at varying angles – 45 and 30 degrees – as shown in Figure 1. They released concrete blocks down each plank, and calculated the kinetic energy of the blocks as they slid down the planks.
The students pushed a cart from the top a hill and allowed it to roll down a series of smaller hills until it came to rest at the end of the course. The students calculated the kinetic energy of the cart at various points on the hill, represented by vertical lines.
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Based on the information in the passage and Figure 1, the average kinetic energy of the blocks sliding down which plank would be greatest?CorrectIncorrect
Suppose the students wanted to test the effects of friction and angle of incline on kinetic energy. How should they alter their experiments to test these effects?CorrectIncorrect
Based on the information provided, as the cart traveled from the peak of the first hill to the peak of the second hill, the kinetic energy of the cartCorrectIncorrect
Suppose the students pushed the cart from an initial hill twice the height of that in Experiment 2. The kinetic energy calculated at the valley of the first hill would most likely be:CorrectIncorrect
Based on the information presented, the students can conclude that which factors affect kinetic energy?CorrectIncorrect