Class 9 Physics Edition
Ever wondered how you can throw a ball at high speeds, sweep a floor rapidly, or lift items using tweezers? It is all thanks to simple machines operating in plain sight.
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Slide 1 of 7
Every lever on Earth has three essential components, no matter its shape:
Use the Easy NCERT "F-L-E" Hack:
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In a Class 3 lever, the Effort is sandwiched between the Fulcrum and the Load.
Key Characteristics:
Because the effort arm is shorter, you must exert more force than the load itself to lift it. Let's see why we would ever want to do that!
"The closer the effort is to the pivot, the more power you need, but the faster the load will travel!"
Slide 3 of 7
Drag the slider below to apply effort. Observe how the Load travels a much larger distance and moves much faster than the Effort.
Distance Multiplying Effect: Notice how a small push in the middle yields a massive sweep at the tip!
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In physics, Mechanical Advantage measures how much force multiplier a machine gives you.
Always Less Than 1 (< 1)
Since the Effort Arm (distance from Fulcrum to Effort) is shorter than the Load Arm, the M.A. is always less than 1.
Slide 5 of 7
We use third-class levers every single day without realizing it!
Your arm is a biological Third-Class Lever!
Top hand pivots, bottom hand pushes effort.
Wrist acts as pivot; other hand applies central force.
Joined at back end; fingers squeeze in the middle.
Cricket bats and hockey sticks multiply hand speed.
Slide 6 of 7
This interactive physics presentation was built and designed by:
Class 9 Physics Practical Application Project.
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