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wedge
two inclined planes that form a sharp edge
long and narrow angle wedge
less forve needed
short and wide angle wedge
more force needed
gears
mechanical systems used to change direction or movement
spur gears
two or more gears in a system
idler gears
a gear placed between a driving gear and a driven gear to transmit motion between them
gear ratios
gr= nr of teeth (driven gear) over nr of teeth (driver fear)
cams
cams convert rotating movement into reciprocating movement of the cam follower (up and down movement)
snail cam follower
moves up and down slowly
eccentric cam follower
the eccentric cam follower has a cam that is off centre
crank
a crank converts rotating movement into reciprocating movement
types of forces
compression tension bending torsion sheer
compression
squeezing force
tension
pulling force
bending
a force that bends a structure
torsion
twisting force
sheer
tearing force
structures
anything made up of parts joined together