Some mechanisms transform
linear motion into rotary motion. Most of these mechanisms are reversible. They
also transform rotary motion into linear motion
The linear motion can be
unidirectional or reciprocating. Reciprocating motions alternate from one side
to the other.
ROTARY LINEAR
TRANSFORMATION
Wheel
With a rotation, a Wheel
moves forward a distance that is equal to its circumference. As a result, we
need less force to move vehicles with larger wheels and they move more quickly.
Rack and pinion mechanism
A racka and pinion
mechanism has two parts. The rack is a bar with many teeth and the pinion is
gear with teeth that interlock with the rack. When the pinion rotates, the rack
moves in a linear direction. If the mechanism is reversible, the pinion also
rotates when the rack mooves. Like a
Wheel, this mechanism transforms rotary motion into linear motion
https://www.youtube.com/watch?v=F1Vy2Iwg5Nw
Nut and bolt mechanism
A nut and bolt mechanism
transforms rotary motion into linear motion. It has two parts: a bolt or shaft with a spiral Groove and a
nut that turns around it. We can turn and tighten the nut i order to hold thing
together. If the nut is held in place, we can turn the bolt to make it move
forward. In this way, we can use a nut and bolt mechanism to lift loads because
it uunctions as a reducing system.
Winch and crank mechanism
A winch is a cylinder
that rotates around a horizontal axis. We attach a rope to the winch and to a
load. Then we turn the crank to rotate the winch. The rope rolls up around the
winch abd lifts the load. The crank increases the force and the winch
transforms rotary motion into linear motion.
The increase in force is
proportinal to the ratio between the radius of the crank and the radius of the
winch. These ratios obey the Law of the Lever.
F×d=R×r
We use winch and crank
mechanism to lift our pull heavy loads. These mechanisms should also include a
braking system to avoid accidents.
No hay comentarios:
Publicar un comentario