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Revision Notes: Simple Machines | Physics for EmSAT Achieve

Lever:- is a simple rigid rod , which is free to rotate about a fixed point called fulcrum.
Principle of Lever:

Revision Notes: Simple Machines | Physics for EmSAT AchieveRevision Notes: Simple Machines | Physics for EmSAT Achieve

Revision Notes: Simple Machines | Physics for EmSAT Achieve

Inclined Plane : is a gentle slope that helps us to move a heavy load with less effort.

Pulley 

Revision Notes: Simple Machines | Physics for EmSAT Achieve

Wheel  & Axle 

  • Effort applied to wheel and load applied to axle .

Screw

  • It is like an inclined plane wound around a rod.

Wedge

  • It is a simple machine with two inclined planes put together forming a sharpened edge.

Efficiency of a Machine

  • Efficiency =  = 
  • Efficiency %  = 
  • Ideal Machine -  100 % efficiency 
  • Practical machine – Efficiency  < 100 %  [Because of friction in internal parts]

Machine Care  

  • To be protected from rust by painting or rust proof coating 
  • Regular oiling to reduce friction
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FAQs on Revision Notes: Simple Machines - Physics for EmSAT Achieve

1. What are simple machines?
Ans. Simple machines are basic mechanical devices that help us perform work more easily. They change the direction or magnitude of a force. The six types of simple machines are the lever, wheel and axle, pulley, inclined plane, wedge, and screw.
2. How do simple machines make work easier?
Ans. Simple machines make work easier by allowing us to apply less force over a greater distance or by changing the direction of the force. For example, using a lever enables a person to lift a heavy object with less effort compared to lifting it directly.
3. Can you give examples of each type of simple machine?
Ans. Yes! - Lever: A seesaw or a crowbar. - Wheel and Axle: A bicycle or a doorknob. - Pulley: A flagpole or a crane. - Inclined Plane: A ramp or a slide. - Wedge: A knife or an axe. - Screw: A jar lid or a screw used in construction.
4. What is the difference between a simple machine and a compound machine?
Ans. A simple machine consists of a single mechanical device that helps in performing work, while a compound machine is made up of two or more simple machines working together. For example, a bicycle is a compound machine because it includes wheels, levers, and pulleys.
5. How do simple machines relate to everyday life?
Ans. Simple machines are all around us and make many everyday tasks easier. For instance, when we use a ramp to move heavy boxes, a screwdriver to tighten screws, or a pulley to lift a load, we are utilizing simple machines to simplify our work and increase efficiency.
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