# Class 3 lever Effort = 2 lb Fulcrum in .NET Drawer PDF417 in .NET Class 3 lever Effort = 2 lb Fulcrum

Class 3 lever Effort = 2 lb Fulcrum
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Example: A pair of tongs is being used by re marshals at a re scene to pick up a one-pound circular ball to be used as evidence Two pounds of effort force is required to lift the object The ngers being used to squeeze the tongs are 4 inches from the object and 2 inches from the fulcrum of the tongs What is the mechanical advantage of the tongs resistance force (load) 1 lb 1 MA = __________________ = _____ = __ effort (force) 2 lbs 2 OR effort (force) distance 2 1 MA = _________________________ = __ = __ resistance force (load) distance 4 2
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The Wheel and Axle
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THE WHEEL AND AXLE IS A WHEEL CONNECTED TO A RIGID POLE
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PART III: REVIEW FOR THE WRITTEN EXAMINATION
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movement of axle
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movement of the wheel
wheel radius 6 MA = ___________ = __ = 6 axle radius 1 Effort (force) is being applied to the steering wheel and therefore multiplied, providing torque on the axle six times greater than the effort (force) applied to the wheel The trade-off, however, is that the steering wheel travels six times farther than the axle does during one full rotation Use the formula below to calculate the amount of effort (force) required when using this simple machine Effort Circumference = Resistance Force Circumference (Force) (Wheel) = (Load) (Axle)
CHAP 9: PRINCIPLES OF MECHANICS
Example: In the drawing below of a well crank (windlass), the handle is attached to a 2-inch radius axle The turning circumference of the crank is 16 inches How much effort (force) is required to lift a bucket of water weighing 40 pounds
AXLE circumference 16
40 lb
Effort (Force) Circumference = Resistance Force Circumference (Crank Wheel) (Load) (Axle) Effort (Force) 16 inches = 40 pounds Circumference (Axle) Find: Circumference of Axle C = 2 radius C = 2 314 2 inches C = 4 inches 314 = 1256 inches Effort (Force) 16 inches = 40 pounds 1256 inches 40 pounds 1256 inches Effort (Force) = _____________________ 16 inches 5024 pounds Effort (Force) = ___________ = 314 pounds 16
The Pulley
A pulley can be considered as a circular lever It is a wheel with a grooved rim and axle with a rope, belt, or chain attached to it in order to change the direction of the pull and lift a load The effort (force) distance is the radius of the pulley (length from the axle to the side of the rope being pulled) The resistance force (load) distance is the radius of the pulley from the axle to the load-carrying side of the rope Pulleys are used to lift heavy loads and can be found in block and tackles, cranes, hydraulic systems, and chain hoists They change the direction of effort (force) making it easier to lift the object or they enhance the effort (force)