Mechanisms – speed of movement
Mechanical systems can be used to increase or decrease the speed of movement and rotation. They can also change the direction of force, movement and direction.
Gear Systems
Gear systems can be used to increase and decrease rotational velocity
Gears are used to increase or decrease the speed or power of rotary motion. The measure of how much the speed or power is changed by a gear train is called the gear ratio (velocity ratio). This is equal to the number of teeth on the driver gear divided by the number of teeth on the driven gear.
To decrease the speed of the output, the driver gear is smaller than the driven gear.
(This will reduce the speed but increase the “torque”.)


To increase the speed of the output the driver gear is larger than the driven gear.
(This will increase the speed of the output but decrease the “torque”.)

