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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