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SC/250 SC250 SC 250 UNIT 6 QUIZ

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SC 250 UNIT 6 QUIZ Week 6 Quiz 1. Question : In an isolated system, the total amount of what is conserved? Student Answer: energy work sunlight matter force Question 2. Question : When a system runs out of energy, it can: Student Answer: still generate power. do no more work. exert no more force. none of the above. all of the above. Question 3. Question : A stalled car is pushed to the top of a hill, allowed to roll down the hill and started by “clutch-popping ” (turning the key while releasing the clutch rapidly). At which point did the car have the greatest amount of potential gravitational energy? Student Answer: at the bottom of the hill at the top of the hill when restarted using the key and clutch being pushed to the top of the hill as it was rolling down the hill Question 4. Question : Which object has the greatest amount of kinetic energy? Student Answer: 250-gram baseball hit at 50 meters/second 300-gram baseball traveling at 50 meters/second 4-kilogram bowling ball traveling at 7 meters per second 4-kilogram bowling ball traveling at 10 meters per second a 120-gram tennis ball served at 50 meters/second Question 5. Question : Which of the following balls would have the greatest amount of kinetic energy if they are all traveling at 10 m/s? Student Answer: baseball ping pong ball soccer ball bowling ball basketball Question 6. Question : The energy stored in all fossil fuels was originally in: Student Answer: dinosaur bones. meteors. Earth’s ocean. uranium deposits. the Sun. Question 7. Question : Which of the following organisms is at the first trophic level? Student Answer: cow killer whale human fungi plants Question 8. Question : Who turned gravitational potential energy into kinetic energy by using a paddle to heat up water and prove that heat is just another form of energy? Student Answer: James Prescott Joule Lord Kelvin Benjamin Thompson Sir Humphry Davy James Watt Question 9. Question : Which of the following has the greatest amount of gravitational potential energy? Student Answer: a case of books sitting on an end table a bowling ball released for the strike one diver at the highest point of the dive a bowling ball dropped from a plane a hawk diving for its prey Question 10. Question : The conservation law in science states that: Student Answer: our natural resources are scarce. once energy is used, it is lost to the system. fossil fuels are an important energy source. conservation will save fossil fuels. the amount of energy in an isolated system stays the same.

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