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Phys Sci Ch 14 B
Test Description: 2nd half of ch 14
Instructions: Answer all questions to get your test result.
1) In which of the following is no work done?
A
none of the above
B
lifting a book
C
climbing stairs
2) A 100 m long ski lift carries skiers from a station at the foot of a slope to a second station 40 m above. What is the IMA of the lift?
A
100
B
40
C
2.5
3) A machine is classified as a compound machine if it
A
is made up of two or more simple machines that operate together
B
has an IMA greater than 1
C
has moving parts
4) The power of a machine measures
A
its strength
B
its rate of doing work
C
the force it produces
5) The bottle opener is what type of a lever?
A
Class 1
B
class 2
C
class 3
6) The mechanical efficiency of any machine is always _____ than 100%.
A
equal to
B
less than
C
more than
7) The force that is exerted on a machine is called the __________ force.
A
input
B
output
8) 2 or more simple machines working together to make up a(an) ______ machine
A
movable
B
simple
C
compound
9) Besides a reduction in friction, the only way to increase the amount of work output of a machine is to _______ the work input
A
increase
B
decrease
10) A device that changes the size or direction of force used to do work is called a(an) _______
A
lever
B
machine
C
pulley
*select an answer for all questions
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