Linear transmission of motion

Linear trasmission mechanisms, such as pulleys, use linear motion input to produce linear motion output

Levers: A lever is a rigid bar that turns around a point called a fulcrum. Various forces may act on the lever at the same time.

Each force produces a specific torque, which is the force multiplied by its distance form the fulcrum.

                                                TORQUE=FORCE X DISTANCE    F x d = R x r 


Classes of levers: We can divide levers into clases according to the locations of the fulcrum, force and resistance.

Class 1 levers can do both of those things

Class 2 levers increase the force that we apply.

Class 3 levers increase the distance that the end of the lever moves.

Brake levers: Bicycle brakes decrease speed. We control them with levers on the handlebars.

A hand crack: A hand crank has two parts. One is connected to a rotating shaft and the other forms a handle.

F x d = R x r

F= Is the force

d= Is its distance

R= Is the resistance in the shaft

r= Is the radius of the shaft itself.

Bicycle handlebars: The handlebars of a bicycle work like a crank. If we place our hands at the ends of the handlebars, they are easier to turn