Phys Sci Ch 14 B: Question Preview (ID: 19023)

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In which of the following is no work done?
a) none of the above b) lifting a book c) climbing stairs d)
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) 2.5 b) 40 c) 100 d)
A machine is classified as a compound machine if it
a) has an IMA greater than 1 b) has moving parts c) is made up of two or more simple machines that operate together d)
The power of a machine measures
a) the force it produces b) its strength c) its rate of doing work d)
The bottle opener is what type of a lever?
a) Class 1 b) class 2 c) class 3 d)
The mechanical efficiency of any machine is always _____ than 100%.
a) equal to b) more than c) less than d)
The force that is exerted on a machine is called the __________ force.
a) input b) output c) d)
2 or more simple machines working together to make up a(an) ______ machine
a) simple b) compound c) movable d)
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 c) d)
A device that changes the size or direction of force used to do work is called a(an) _______
a) pulley b) lever c) machine d)
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