Simple machines

Question 1

What are Wedges?

Answer 1

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

Question 2

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

Answer 2

its height and width.

Question 3

Equation of wedges?

Answer 3

EH=WL

Question 4

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

Answer 4

Inclined planes

Question 5

What is the use of Inclined Planes?

Answer 5

It is used to raise or lower heavy objects.

Question 6

Equation of Inclined Planes?

Answer 6

El = WH
EL = mgH

Question 7

Is a wheel with groove in it.

Answer 7

Pulleys

Question 8

What are the used of Pulleys?

Answer 8

used to lift or lower heavy objects

Question 9

How the pulleys facilitate work and saves labor?

Answer 9

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

Question 10

How many type of pulleys and what are those

Answer 10

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

Question 11

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

Answer 11

A fixed pulley

Question 12

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

Answer 12

A fixed pulley

Question 13

What pulley facilitate work but not saves labor?

Answer 13

A fixed pulley

Question 14

Equation of fixed pulley

Answer 14

Es = Wh
Es=mgs
E=mg

Question 15

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

Answer 15

movable pulley

Question 16

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.

Answer 16

A movable pulley

Question 17

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

Answer 17

A movable pulley

Question 18

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

Answer 18

A movable pulley

Question 19

Equation of movable pulley

Answer 19

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

Question 20

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

Answer 20

Black and tackle pulley

Question 21

What are the 3 type of black and tackle pulley

Answer 21

type 1
type 2
type 3

Question 22

Block and tackle type 1

Answer 22

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

Question 23

Block and tackle type 2

Answer 23

-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.

Question 24

Block and tackle type 3

Answer 24

-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.

Question 25

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

Answer 25

Wheels and axles

Question 26

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

Answer 26

Wheels and axles

Question 27

Equation of Wheels and axles

Answer 27

ER = Wr
ER = mgr

Question 28

_________ is an inclined plane wrapped around a cylinder.

Answer 28

Screws

Question 29

What is a used of the screws?

Answer 29

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

Question 30

equation of screws

Answer 30

E x 2πR = Wh
E x 2πR = mgh