WHEEL AND AXLE

WHEELS

• A wheel is usually a disk that rotates around an axis
• it can be any rotating object in which a force is applied
• the wheel and axle rotate together as a unit

AXLE

• Any device that includes a crank handle employs the wheel-axle principle
• An axle is a smaller disk
• The axle attaches to the wheel at its rotational axis

WHEEL AND AXLE

• The wheel’s radius is longer than the axle’s
• their ratio, along with the locations of the effort and resistance forces determines the ideal MA
• The ideal MA of this wheel-axle system is around 1/10 or less

WHEEL AND AXLE

• the wheel and axle rotate together as a unit
• A bicycle’s pedal-and-sprocket-wheel system is an example of a wheel-axle system
• Ex. the drive wheel of a car

WHEEL AND AXLE

• to turn the wheel of a car requires a great deal of power
• wheel-axle system is like a rotating third-class lever
• Wheel-axle systems may not always look like a disk attached to an axle

WHEEL AND AXLE

• can openers, fishing reels, and manual pencil sharpeners
• Almost any machinery
• Use the wheel and axle system