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Science 6 > Chapter 9 - Machines > Flashcards

Chapter 9 - Machines Flashcards

1
Q

work

A

a force acting on something and moving it a distance

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2
Q

work =

A

force x distance

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3
Q

machine

A

any object that makes work easier

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4
Q

simple machines are

A

lever, pulley, wheel and axle, inclined plane, wedge, screw

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5
Q

lever

A

any bar that turns on a point

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6
Q

fulcrum

A

the point where the bar or lever turns

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7
Q

effort force

A

the force applied to a simple machine

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8
Q

resistance force

A

force that works against the effort

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9
Q

first class lever

A

The fulcrum is positioned between the effort and resistance

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10
Q

second class lever

A

The fulcrum is positioned at one end of the bar and the resistance is between the fulcrum and the effort

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11
Q

third class lever

A

The fulcrum is at one end of the bar and the effort is between the fulcrum and the resistance

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12
Q

types of pulleys

A

fixed pulley, movable pulley, block and tackle

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13
Q

fixed pulley

A

attached, does not move, changes the direction of the pull

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14
Q

moveable pulley

A

not attached, moves, reduces the amount of force needed to move an object, 1/2 force = twice distance

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15
Q

block and tackle

A

at least one fixed and one moveable pulley

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16
Q

mechanical advantage

A

the decrease in effort needed to move an object

17
Q

wheel and axle

A

A wheel with a rod, or axle, running through it; both pieces move at the same time, turning axle gives increased distance, turning larger part gives increased force.

18
Q

inclined plane

A

a flat, slanted surface, such as a ramp

19
Q

wedge

A

two inclined planes back to back, splits, moves object

20
Q

screw

A

an inclined plane wound around a cylinder or a cone

21
Q

compound machine

A

a machine that combines two or more simple machines

Science 6 (3 decks)

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