Work And Machines: Question Preview (ID: 194)


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A slanted surface used to raise an object is a(n) ____.
a) efficiency board b) effort ramp c) inclined plane d) screw
A device that does work with only one movement and changes the size or direction of a force is a(n)В ____.
a) compound machine b) effort machine c) screw d) simple machine
A bar that is free to pivot about a fixed point is a ____.
a) fulcrum b) lever c) ramp d) wedge
The rate at which work is done is called ____.
a) efficiency b) effort time c) force d) power
The amount by which a machine multiplies an effort force is called the ____.
a) efficiency factor b) fulcrum c) mechanical advantage d) resistance force
An inclined plane with one or two sloping sides forms a machine called a ____.
a) pulley b) lever c) ramp d) wedge
A machine that changes only the direction of a force has a mechanical advantage ofВ ____.
a) 100 b) 10 c) 5 d) 1
Two simple machines that are part of a bicycle are a(n)____.
a) gear and a wheel and axle b) inclined plane and lever c) inclined plane and wedge d) screw and inclined plane
An arrangement of pulleys designed to reduce the effort force is called a ____.
a) block and tackle b) fixed pulley c) movable pulley d) simple pulley
When two or more simple machines work together, they are called a(n)____.
a) screw b) effort machine c) compound machine d) simple machine
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