Simple machines Flashcards

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1
Q

What are Wedges?

A

is a portable inclined plane that can separate, lift, or hold an object in place.

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2
Q

The effort needed to drive a wedge into an object depends on?

A

its height and width.

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3
Q

Equation of wedges?

A

EH=WL

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4
Q

An ______ __ is a flat surface that is tilted at an angle.

A

Inclined planes

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5
Q

What is the use of Inclined Planes?

A

It is used to raise or lower heavy objects.

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6
Q

Equation of Inclined Planes?

A

El = WH
EL = mgH

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7
Q

Is a wheel with groove in it.

A

Pulleys

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8
Q

What are the used of Pulleys?

A

used to lift or lower heavy objects

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9
Q

How the pulleys facilitate work and saves labor?

A

by changing the direction of force to act in the same direction as gravity

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10
Q

How many type of pulleys and what are those

A

3
1.A fixed pulley
2.movable pulley
3.block and tackle pulley

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11
Q

“__ ____ pulley” is attached to a fixed point, and its rope moves freely in the groove of the wheel.

A

A fixed pulley

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12
Q

____ ____ in order to lift the load, the effort applied on the rope must be equal to the weight of the load

A

A fixed pulley

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13
Q

What pulley facilitate work but not saves labor?

A

A fixed pulley

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14
Q

Equation of fixed pulley

A

Es = Wh
Es=mgs
E=mg

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15
Q

“__ ______ pulley” is free to move up and down.

A

movable pulley

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16
Q

What pulley the load is attached to the wheel and the wheel is supported by two parts of the same rope with one end attached to a fixed point.

A

A movable pulley

17
Q

Which pulley to lift the load, the effort applied to he rope must be equal to one-half the weight of the load

A

A movable pulley

18
Q

Which pulley makes the effort bigger, and it saves labor and facilitates work?

A

A movable pulley

19
Q

Equation of movable pulley

A

Es = Wh
Es=mg(s/2)
E=mg/2

20
Q

Which type of pulley is a combination of fixed and movable pulleys, with a rope threaded between them?

A

Black and tackle pulley

21
Q

What are the 3 type of black and tackle pulley

A

type 1
type 2
type 3

22
Q

Block and tackle type 1

A

-has a fixed and several movable pulleys.
-A load is attached on the bottommost
-Pulley and an effort is applied over the fixed pulley

23
Q

Block and tackle type 2

A

-has a top fixed block and a bottom movable block.
-A load is attached on the bottommost pulley
-an effort is applied over the topmost pulley.

24
Q

Block and tackle type 3

A

-has a fixed pulley and several movable pulleys.
-one end of each rope is attached to a block that hold the load and an effort is applied over the last pulley.

25
Q

__ __ __ ____ consists of a larger wheel attached to a smaller cylindrical axle.

A

Wheels and axles

26
Q

“__________” saves labor by making a force bigger ;a small force applied to the large wheel can move a heavy load attached to the axle.

A

Wheels and axles

27
Q

Equation of Wheels and axles

A

ER = Wr
ER = mgr

28
Q

_________ is an inclined plane wrapped around a cylinder.

A

Screws

29
Q

What is a used of the screws?

A

used to hold objects together, list heavy objects and tighten parts of an objects

30
Q

equation of screws

A

E x 2πR = Wh
E x 2πR = mgh