IPC Review-Work And Machines Question Preview (ID: 1443)


IPC Review-Work And Machines.

For work to occur, an object must
a) move
b) remain still
c) be alive
d) be powerful

Which of these is the amount of work done in a certain amount of time?
a) machine
b) force
c) power
d) effort

_____________ increase applied force and/or change direction of force to make work easier.
a) directions
b) powers
c) forces
d) machines

Power is measured in ____________.
a) calories
b) watts
c) friction
d) amps

_________ is the number of times a machine multiplies the effort force.
a) efficiency
b) output
c) mechanical advantage
d) fulcrum

Levers, pulley, screws, and inclined planes are all
a) gears
b) wedges
c) simple machines
d) compound machines

A machine that does work with only one movement is a
a) compound machine
b) simple machine
c) pulley
d) block and tackle

____________ is a measure of how much of the work put into a machine is changed into useful output work by the machine.
a) mechanical advantage
b) efficiency
c) power
d) work

______________ is force X distance.
a) power
b) work
c) efficiency
d) resistance

In machines, some energy is changed to heat due to
a) friction
b) effort
c) power
d) work

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