section 3- types of machined

Question 1

what are levers used for

Answer 1

to apply force to a load

Question 2

what are the three classes of levers

Answer 2

fulcrum
load
input force

Question 3

where is the input force located in the first class lever

Answer 3

left

Question 4

what do first class levers always do

Answer 4

change the direction of the input force

Question 5

what can first class levers be used for

Answer 5

increase force

increase distance

Question 6

where is the input force located in the second class lever

Answer 6

the right

Question 7

do second class levers change the direction of the input force

Answer 7

no

Question 8

what allows you to apply less force than the force exerted by the load

Answer 8

second class lever

Question 9

what happens when the output force is greater than the input force

Answer 9

you must exert the input force over a greater distance

Question 10

where is the input force located in the third class lever

Answer 10

middle

Question 11

do third class levers increase the input force or change the direction of the input force

Answer 11

no

Question 12

is the output force less than the input force in the third class lever

Answer 12

yes

Question 13

what is a simple machine that has a grooved wheel that holds a rope or cable

Answer 13

pulley

Question 14

when a load is attached to one end of the rope from the pulley what is applied to the other end

Answer 14

input force

Question 15

what is attached to something that does not move

Answer 15

fixed pulley

Question 16

what pulley makes you pull down on the rope to lift the load up

Answer 16

fixed pulley

Question 17

what pulley changes direction of the force

Answer 17

fixed pulley

Question 18

what are attached to the object being moved

Answer 18

movable pulley

Question 19

does a movable pulley change a force’s direction

Answer 19

no

Question 20

what do movable pulleys increase

Answer 20

force and distance

Question 21

what pulley is a fixed pulley and a movable pulley used together what is the pulley system called

Answer 21

block and tackle

Question 22

what does the mechanical advantage of a block and tackle depend on

Answer 22

the number of rope segments

Question 23

what is a simple machine conditioning of two circular objects of different sizes

Answer 23

wheel and axle

Question 24

how can you find the mechanical advantage of a wheel and axle

Answer 24

by dividing the radius of the wheel by the radius of the axle

Question 25

what is a simple machine that is a straight slanted surface

Answer 25

inclined plane

Question 26

what is an example of an inclined plane

Answer 26

ramp

Question 27

what happens when the ratio of an inclined planes length to its height

Answer 27

the greater the ma is

Question 28

how can the mechanical advantage of an inclined plane be calculated

Answer 28

dividing the length of the inclined plane by the height to which the load is lifted

Question 29

what is a pair of inclined planes that moves

Answer 29

wedge

Question 30

what does a wedge apply

Answer 30

an output force that is greater than your input force

Question 31

the longer the wedge is the ___________ the wedge is

Answer 31

thinner

Question 32

what is required in a wedge

Answer 32

less input force

Question 33

how do you find the mechanical advantage of an wedge

Answer 33

by dividing the length of the wedge by its greatest thickness

Question 34

what is an inclined plane that is wrapped in a spiral around a cylinder

Answer 34

screw

Question 35

what happens when a screw is turned

Answer 35

A small force is applied over the long distance along the incline plane of the screw

Question 36

what is a A machine that is made of two or more simple machines

Answer 36

compound machine

Question 37

is the mechanical efficiency of most compound machines high or low

Answer 37

Low

Question 38

can to much friction damage the simple machines that make up the compound machine

Answer 38

ya

Question 39

what is a simple machine that has a bar that pivots at a fixed point called the fulcrum

Answer 39

lever