Simple Machines Efficiency

Simple Machines Efficiency

7th - 8th Grade

11 Qs

quiz-placeholder

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Simple Machines Efficiency

Simple Machines Efficiency

Assessment

Quiz

Science

7th - 8th Grade

Practice Problem

Hard

NGSS
MS-PS3-5, MS-ETS1-1, MS-PS3-2

+1

Standards-aligned

Created by

Charles Martinez

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11 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Ratio to work out to work in

Efficiency
Law of Conservation of Energy
Transformation
Lumens

Tags

NGSS.MS-PS3-5

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the efficiency of a machine when the input is 263 J and the output is 142 J. {Eff = Work out/Work in) x100}

1.85 %

18.5 %

5.39 %

53.9 %

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The law of conservation of energy states that when one form of energy is converted into another,

energy is destroyed in the process
no energy is destroyed in the process
energy is created in the process
some amount of energy cannot be accounted for

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-3

NGSS.MS-PS3-5

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the machine? {Eff = Work out/Work in) x100}

0.25 J

26%

386%

3.86 J

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the efficiency of the machine if the input is 263 J and the output is 142 J? {Eff = Work out/Work in) x100}

6.26%

54%

100%

260%

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules? {Eff = Work out/Work in) x100}

87.50%

1200

1.142

114%

Tags

NGSS.MS-ETS1-1

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The work input of the device is fixed at 10 joules, so Lucas is trying to improve work output. How many joules of work output should Lucas aim for to attain his goal of 90% efficiency? {Eff = Work out/Work in) x100}

9 Joules

900 Joules

0.9 Joules

25

Tags

NGSS.MS-PS3-5

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