Work Efficiency Machines

Quiz
•
Science
•
7th - 8th Grade
•
Hard
+1
Standards-aligned
Charles Martinez
FREE Resource
11 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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 %
Tags
NGSS.MS-PS3-5
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tags
NGSS.MS-PS3-4
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
Tags
NGSS.MS-ETS1-1
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%
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-PS3-3
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