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Chpater 8 machines

Chapter 8

QuestionAnswer
Work The result of a force causing an object to move in the direction of the force.
Work is ONLY done when The direction of force and direction of motion are the same direction.
These 2 things must be present in order for work to be occurring The object moves as the force is applied and the direction of the objects motion is the same as the direction of the force.
What is the work formula? Work equals force times distance
Power The rate at which work is done.
What is the power formula? Power equals work done divided by time it took to do the work.
Watt The unit to express power.
Machine A device that helps make work easier.
Work Input The work you do on a machine.
Work Output The work done by a machine.
When can work output be GREATER than work input? Never.
“Machines don’t save work” . True or false? Explain your answer true, they make work easier however you still have to do work on the machine.
Mechanical Advantage How many times the machine multiplies the force.
Mechanical Advantage formula output force divided by the input force.
What are the 6 simple machines? Lever, Pulley, Inclined plane, wedge, screw, and axle.
Lever A simple machine consisting of a bar that pivots at a fixed point, called a fulcrum.
Examples of a lever See Saw, hammer, wheel barrow.
Fulcrum A bar that pivots at a fixed point.
Examples of each of the 3 classes of levers Class 1: See Saw, Class 2: Wheel Barrow, Class 3: Hammer.
Inclined Plane A simple machine that is a straight, slanted surface.
How do you increase the mechanical advantage of an inclined plane? the longer the inclined plane is than the height, the higher the mechanical advantage.
Examples of Inclined Planes Ramp
Wedge A double inclined plane that moves.
Examples of Wedges Knife, doorstops, and axe heads.
Screws An inclined plane that is wrapped in a spiral.
Examples of Screws A screw and a jar lid.
How do you change the mechanical advantage of a screw? The loner the spiral on a screw is and the closer together the threads, than the greater the screw’s mechanical advantage.
Wheel & Axle A simple machine consisting of two circular objects of different sizes.
Examples of Wheel & Axle A steering wheel.
Pulley A simple machine consisting of a grooved wheel that holds a rope or a cable.
Examples of Pulleys A crane.
Created by: AD12398
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