# Science

8. Which would best reduce the amount of energy needed to pull a wagon up a ramp? (1 point)
increasing the slope of the ramp
reducing the friction between the wagon wheels
reducing the length of the wagon handle
increasing the friction between the wagon wheels
9. To lift a load to the roof, you apply 21 N of force to a pulley. The pulley applies 21 N of force to the load. What is the mechanical advantage of the pulley? (1 point)
0
1
40
21
10. Carla applied a force of 35 N to a wheelbarrow full of bricks and moved it 2.5 m. Which of the following can be determined from this information? (1 point)
The wheelbarrow supplied 87.5 J of work.
The wheelbarrow has a mechanical advantage of 14.
The wheelbarrow is 7 percent efficient.
The wheelbarrow has 87.5 J of potential energy.

8.b
9.c
10.a

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1. 8.b yes
9.c Huh? 21/21 = 1
10.a I do not think so. She, not the wheelbarrow, supplied the work.
If it weighed 35 N and she lifted it 2.5 meters, then D would be correct.
The problem is poorly written. It is not clear if the force is in the direction of motion.

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posted by Damon
2. CA Unit 2 Lesson 4
Gravitational Potential Energy
1)B
2)A
3)D
4)B
5)C
6)A
7)D
8)B
9)B
10)A

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3. 8.B
9.C

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posted by kc
4. Are they right?

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5. No they are wrong only 8/10 :(

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posted by Jackson
6. B
A
D
B
C
A
D
B
B
A

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posted by Taylor
7. Do you have the right answers?

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8. Taylor and anon are correct

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posted by Racen
9. oh ok I will try them

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10. ok

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11. Is it for unit 2 or 3?

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12. They are correct and it is for unit 3. For 8th grade science.

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13. THANK YOU SO MUCH! TAYLOR IS CORRECT YES FINALLY SO SO GREATFUL!!!!!!!!!! :D

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14. Taylor is 100% correct. Just be sure to answer with all her answers correctly!!

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15. Does this work for 6th grade science as well because the questions are the same

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posted by Mia
16. Thank you so much Taylor is a 100% correct

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posted by 8845637
17. So is Taylor correct with her answers? It’s only 1-10. It’s the same for me but 1-11 for 6th grade science same questions pls help

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posted by Gal42

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