DT

Question 1

what are the 4 types of movemet/direction

Answer 1

linear
rotary motion
reciprocating motion
oscillating motion

Question 2

linear

Answer 2

moves in a straight line

Question 3

rotary motion

Answer 3

moves around a central axis

Question 4

reciprocating motion

Answer 4

moves back and forth or up and down in a straight like

Question 5

oscillating motion

Answer 5

moves back and forth along a curved line

Question 6

input

Answer 6

the force put it

Question 7

process

Answer 7

what the force causes (mechanism)

Question 8

output

Answer 8

result of input

Question 9

what are the 3 types of levers

Answer 9

load
effort
fulcrum

Question 10

examples of 1st class levers

Answer 10

see-saw , scissors

Question 11

examples of 2nd class levers

Answer 11

wheelbarrow , stapler

Question 12

examples of 3rd class levers

Answer 12

broom , tweezers

Question 13

what are linkages

Answer 13

a collection of levers joined together

Question 14

what is a reverse motion linkage

Answer 14

changes the direction of the motion

Question 15

what are cams

Answer 15

shaped pieces of metal or plastic fixed to a rotating shaft

Question 16

what are the 3 parts of cam mechanisms

Answer 16

cam slide follower

Question 17

what does a cam do

Answer 17

rotates continually

Question 18

what does a follower do

Answer 18

moves up and down (rise and fall , dwell

Question 19

what does a slide do

Answer 19

prevents follower from moving side to side

Question 20

different shaped cams…

Answer 20

cause different outputs

Question 21

round and shaft center cam=

Answer 21

dwell

Question 22

different shape and shaft not central-

Answer 22

rise or fall

Question 23

what are gear trains

Answer 23

a number of gears connected together

Question 24

what are gears

Answer 24

toothed wheels connected to shafts

Question 25

how do gears work

Answer 25

the teeth interlock and the driver shaft rotates

Question 26

what are spur gears

Answer 26

both rotate in the opposite direction

Question 27

which gear always rotates faster

Answer 27

the small gear

Question 28

what is the difference between the 2 speeds called

Answer 28

velocity

Question 29

what is the gear ratio

Answer 29

gear ratio= number of teeth on driven gear/number of teeth on the driver gear e.g 60/15=4

Question 30

what do pulleys do

Answer 30

change the direction/speed/torque/turning force

Question 31

what is a pulley system

Answer 31

2 pulleys on a shaft connected by a bekth

Question 32

how do pulleys help

Answer 32

make changing direction of the force easier

Question 33

torque meaning

Answer 33

how much a force is acting on an object that makes it rotate

Question 34

what is the difference of pulley speeds called

Answer 34

the velocity ratio