Mechanical devices- pulley and velocity ratio

Question 1

first class lever

Answer 1

EFR example pliers

Question 2

second class lever

Answer 2

ERF example nutcracker

Question 3

third class lever

Answer 3

REF- tweezers

Question 4

mechanical advantages

Answer 4

load divided by effort

Question 5

velocity ratio

Answer 5

distance travelled by effort divided by distance travelled by load

Question 6

efficiency

Answer 6

mechanical advantage divided by velocity ratio multiplied by 100

Question 7

define rotatory motion

Answer 7

motion around a central point. bicycle wheel or fan blade

Question 8

define reciprocation

Answer 8

moving backwards and forwards in a straight line. sewing machine needle

Question 9

define linear

Answer 9

moving in a straight line in one direction. e.g. train travelling on a track

Question 10

define oscillations

Answer 10

moving while swaying back and fourth. e.g. a swing

Question 11

what to pulleys and belts do

Answer 11

the transmit rotatory motion from a driver shaft to driven shaft.

Question 12

To find velocity ratio

Answer 12

driven pulley diameter divided by driver pullet diameter

Question 13

How to find output speed

Answer 13

input speed divided by velocity ratio.

Question 14

velocity ratio

Answer 14

number of teeth by driven gear divided by number of teeth by driver gear