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## Physics / Simple Machines

### Physics / Simple Machines

Machines are the devices which make our work easier and faster.

1) Machines helps in gaining force. With the help of machines, small force can be used to overcome a large force e.g. screw jack can lift an object as heavy as car to change its tyres.
2) Machine can change the direction of the force so that force can be applied in a more convenient manner e.g. rope passing over a wheel make easy to lift water from well.
3) Machines helps in carrying out unsafe and dangerous tasks e.g. pair of tongs can be used to lift a piece of burning coal from fire.

• Learn about simple machines and their different types - Lever, Inclined plane, Screw, Wheel and axle, wedge, pulley.
• Learn about terms that are used in simple machines -

Effort: An effort is the force applied to a machine to do mechanical work.
Load: Load is the force that a machine exerts on a given body to be moved.
Fulcrum : A fixed point about which the machine can turn. Mechanical advantage of the lever = MA = effort arm/ load arm.

• Find out to which class lever do the following object belongs- Scissor, Nut cracker, Seesaw, Wheel barrow, Fishing rod.
• Learn how principle of inclined plane is used in screw and learn to make your own simple machines.

Exercises
Lessons
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Exercises
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• ### Simple Machines - SmartTest

A SmartTest on Simple Machines

• Accessed by: 633 Students
• Average Time: 00:07:13
• Average Score: 62.83
• Questions: 14
• Introduction to simple machines
• Terms related to simple machines
• Lever and its types
• Inclined place
• Screw
• Wheel and axle
• Wedge
• Pulley
• Care of machines
• Review of simple machines
• ### Simple Machines -- Summary

Learnhive Lesson on Simple Machines

• Accessed by: 481 Students