PS 14.3 Formative
Authored by Mike Hall
Science
9th Grade
NGSS covered
Used 14+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The actual mechanical advantage of a machine
cannot be less than 1
increases with greater friction
is always less that the ideal mechanical advantage
is always equal to the ideal mechanical advantage
2.
FILL IN THE BLANKS QUESTION
30 sec • 1 pt
If you have to apply 40 N of force on a crowbar to lift a rock that weighs 400 N, what is the actual mechanical advantage of the crowbar?
(a)
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Reducing friction in a machine
decreases the actual mechanical advantage
decreases the work output
increases its efficiency
increases its ideal mechanical advantage
Tags
NGSS.MS-ETS1-1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The efficiency of a machine is always less than 100% because
a machine cannot have an ideal mechanical advantage greater than 1
some work input is lost to friction
the work input is too small
the work output is too great
5.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
The (a) of a machine is the number of times that the machine increases the input force.
6.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
The mechanical efficiency of any machine is always (a) than 100 percent.
7.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
The percentage of work input that becomes work output is the (a) of a machine.
Tags
NGSS.MS-PS3-3
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