3.1.5 Mechanical devices Flashcards
(11 cards)
1
Q
mechanical advantage
A
MA= load/ effort
2
Q
1st class lever
A
load, fulcrum, effort down
FOOD PLIERS
SEASAW
3
Q
2nd class lever
A
effort up, load, fulcrum
WHEELBARROW
4
Q
3rd class lever
A
load, effort up, fulcrum
TWEEZERS
5
Q
bell crank linkage
A
change direction of motion by 90 degrees
6
Q
push/ pull linkage
A
maintains direction
7
Q
reverse linkage
A
if the fixed point is closer to output it increases the magnitude
8
Q
gears
A
driver gear and idler gear
output= driven gear
input= driver gear
9
Q
cams
A
eccentric
pear
snail
heart
10
Q
fixed pulley
A
enables pulling a load from a different direction with the same effort
11
Q
block and tackle pulley
A
uses two pulleys, one fixed, one movable to move a load with HALF the effort
