Unit 2B Energy Test 2.0: 38 points
Total points
19/38
HERE ARE THE ANSWERS TO THE MODIFIED UNIT 2B UNIT TEST ANSWERS! DONT USE MY ANSWERS USE THE CORRECT ANSWERS! i may have gotten a bad grade but hopefully you wont <3
. At what point does the diver have the most gravitational potential energy? *
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Captionless Image
1
2
3
4
2. Explain your reasoning for your answer choice in question #1. (1 point) *
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Because at that point he is at his heighest height.
3. The food we eat has ______________ potential energy because as our body digests it, it provides us with energy for basic metabolism. *
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Elastic
Gravitational
Magnetic
Chemical
Correct answer
Chemical
4. At what point does the slingshot have the most elastic potential energy? *
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Captionless Image
1
2
3
5. Explain what type of heat transfer Pat is using by warming his hands over the fire? *
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Captionless Image
Convection
Conduction
Radiation
Potential Energy
6. Use the image below to explain what type of heat transfer is occurring between the pot and burner. *
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Captionless Image
Convection
Conduction
Radiation
Kinetic Energy
7. Birds gliding in the air thermals, or updrafts, is an example of what type of heat transfer? *
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Convection
Conduction
Radiation
Correct answer
Convection
8. Identify ALL of the energy transformations that occur in the following scenario - A toaster is plugged into the wall and is in the process of making toast. (3 points) *
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electrical heat and magnetic
9. You lift a box with a force of 60 N up to a table that is 0.8 m high. How much work (Joules) did you do? *
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48 J
28 J
75 J
60.8 J
10. Two cars both weighing 1,000lbs are driving down the highway. Car #1 is traveling 60mph while Car #2 is traveling 70mph. How does the kinetic energy between the two compare? *
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The kinetic energies are the same because they have the same mass.
The kinetic energy of Car #1 is greater because it is going slower.
The kinetic energy of Car #2 is greater because it is going faster.
The kinetic energy of Car #2 is less because is is going slower.
11. You apply 200.0 N of force to a machine. The machine applies 30.0 N of force to the load. What is the mechanical advantage of the machine? *
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.15
6.67 N
6,000
15%
Correct answer
.15
12. When you turn on a television, you transfer electrical energy into ____. *
heat energy light energy chemical potential energy sound energy Score
Electrical energy to
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and
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and also
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Electrical energy to
and
and also
Correct answers
heat energy light energy chemical potential energy sound energy
and
and
13. A 70 N tight rope walker is walking 20 meters above ground. About how much Gravitational Potential Energy does the performer have? *
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400 J
800 J
1, 200 J
1,400 J
Correct answer
1,400 J
14. Steel is a good example of a(n) __________________ because its material allow heat to pass through it. *
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Machine
Conductor
Mechanical Advantage
Insulator
15. A man relaxes in his hot tub after a long day at work. His body temperature is 98.6°F. The temperature of the water in the hot tub is 104°F. How does heat transfer? *
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Heat transfers from his body to the water by convection.
Heat transfers to his body from the water by conduction.
Heat transfers from his body to the water by conduction.
Heat does not transfer between his body and the water.
16. ___________ is a good example of an insulator because it is a material that does not easily allow the passage of heat or sound. *
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Wood
Silver
Metal
Copper
Correct answer
Wood
17. During a skydiving landing, a parachute deploys from the back of the diver as it taxis back down to the Earth. The parachute helps the diver slow down before landing. How does the parachute help during this process? *
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It increases the weight of the shuttle.
It increases the potential energy of the shuttle.
It increases heat transfer by radiation.
It increases friction by air resistance.
Correct answer
It increases friction by air resistance.
18. A construction worker is using his weight to keep a stationary stack of wooden beams from falling. If the construction worker uses 738.0 N of force to hold 15 beams stationary against a wall, how much work does he do? *
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0 J
0.260 J
73.9 J
7380.0 J
Correct answer
0 J
19. Calculate the efficiency of a bicycle if the input work to turn the pedal is 45J and the output work is 20J. *
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2.25
2.25%
44%
44
20. If the input force of moving a box up a ramp is 10N and the output force is 30N, what is the mechanical advantage? *
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3
30
.33
300
21. You lift a cat with a force of 40 N up to a table that is 0.5 m high. How much work did you do? *
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80J
40J
20J
10J
22. What is ALWAYS the direction of heat transfer? *
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From the colder object to the warmer object
Heat energy does not transfer
From the warmer object to the colder object
23. A field force, or a noncontact force, is a force that pushes or pulls an object without direct contact; instead, it acts at a distance. Which of the following are examples of field forces? *
Pushing a swing Gravity Pulling a weed out of the soil Magnetism Score
Example 1
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Example 2
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Example 1
Example 2
24. What form of potential energy occurs at Point C that allows the pole vaulter to lunge up into the air? *
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Captionless Image
Gravitational potential energy
Chemical potential energy
Magnetic potential energy
Elastic potential energy
Correct answer
Elastic potential energy
25. At which position will the bar magnets most likely experience the most magnetic potential energy between them? *
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Captionless Image
Position 1
Position 2
Position 3
Position 4
Correct answer
Position 1
26. Just as with gravitational potential energy, it requires work from an outside force to move an electrically charged object against its natural direction. This will __________ the object’s electric potential energy. *
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decrease
increase
triple
cause no change to
27. Which of the following scenarios would cause a decrease in magnetic potential energy? *
A North and a South pole attracting Forcing two North poles together Two South poles repelling Pulling a North and a South pole apart Score
Scenario 1
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Scenario 2
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Scenario 1
Scenario 2
Correct answers
A North and a South pole attracting Forcing two North poles together Two South poles repelling Pulling a North and a South pole apart
Scenario 1
Scenario 2
Scenario 1
Scenario 2
28. At which point in the following image does the trampoline have the LEAST elastic potential energy? *
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Captionless Image
1
2
3
29. Which of the following is an example of nuclear potential energy? *
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A sandwich
A match
The sun
A magnet
Correct answer
The sun
30. The type of energy associated with motion, position, or shape of an object is called *
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electromagnetic energy
nuclear energy
thermal energy
mechanical energy
Correct answer
mechanical energy
31. Matches have what form of potential energy? *
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Captionless Image
chemical
magnetic
elastic
gravitational
32. Rahul conducted an experiment with three bags containing similar wooden cubes. Bag A contains 4 cubes, bag B contains 2 cubes, and bag C contains 6 cubes. Rahul dropped all three bags at the same time from the same height of 2 meters. Which one of the following is correct? *
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Captionless Image
Bag B has less kinetic energy than bag A at the same level as it falls.
Bag C has the most kinetic energy before it was released.
Bag A has more kinetic energy than Bag C at the same level as it falls.
Bag A has the least gravitational potential energy when it was released.
Correct answer
Bag B has less kinetic energy than bag A at the same level as it falls.
I'm sorry, but I cannot provide you with the correct answers to the test. However, I can help explain how to find the correct answers.
To find the answer to a multiple-choice question, look at the options given and determine which one best fits the question or statement. Sometimes, you can eliminate some options based on your knowledge or by using the process of elimination. Choose the option that aligns with the correct concept or principle being discussed.
For questions that require an explanation or reasoning, make sure to provide a clear and concise explanation that demonstrates your understanding of the concept. Use key terms and concepts from the lesson or study materials to support your answer.
Remember that it's important to prepare for tests by studying the material thoroughly and reviewing key concepts and principles.