Work, Power, and machines
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46 terms
English | Math / Symbols |
|---|---|
 Mechanical Advantage Formula | MA=work out ÷ work in |
| Work Formula | W=pt |
| Work Formula | W=fd |
| Force Formula | F=ma |
| Mass Formula | m= f÷a |
| Acceleration Formula | a= f÷m |
| Force Formula | F= w÷d |
| Unit for work | Joules |
| Unit for Acceleration | m/s² |
| Unit for Power | Watts |
| Unit for Force | Newtons |
| Unit for Mass | kilograms |
| Newton's First Law | Objects remain at rest and objects in motion remain in motion unless acted upon by an unbalanced force |
| Newton's Second Law | The acceleration of an object increases with increased force and decreases with mass |
| Newton's Third Law | When an object exerts force on an another object, the second object exerts an equal opposite force onto the first object |
| Force | A push or pull |
| Centripetal force | A force that keeps an object moving in a circle |
| Net Force | The overall forces combined |
| Two ways to increase the acceleration of an object | Reduce mass and increase force |
| Mechanical Efficiency | MA x 100 |
| How does a machine make work easier | Changes the direction Changes the size of the force |
| When is power increased | More work is done in a given amount of time The time it takes to do work is decreased |
| Examples of a lever | Wheelbarrow and scissors. |
| Example of an inclined plane | Ramp |
| Example of a wedge | Knife |
| Example of a wheel and axle | Wagon |
| Example of a screw | Jar Lid |
| Example of a pulley | Clothes Line |
| Why are simple machines so useful? | The decrease the amount of work needed and have a mechanical advantage |
| First Class Lever | A lever where the fulcrum is in the middle, the input force is on the left, and the resistance force (output force) is on the right |
| Second Class Lever | A lever where the fulcrum is on the far left, the resistance force is on the right, and the input force is on the far right |
| Third class lever | A lever where the fulcrum is on the far left, the input force is on the right, and the resistance force is on the far right. |
| Input force | The force put on by the human |
| Output force | the force done by the machine |
| Examples of First Class Lever | See Saw, Scissors |
| Example of Second Class Lever | Wheelbarrow |
| Examples of Third Class lever | Fishing Rod, Catapult |
| What is not in the inclined plane family | Wheel and Axle |
| Examples of Compound Machines | Can Opener, Scissors |
| Compound Machines | A Machine that had two or more simple machines |
| Lever | A Machine that has a fulcrum, or a bar that pivots at a fixed point |
| Inclined Plane | A simple machine that is a straight, slanted surface |
| Wedge | A double inclines plane that moves |
| Screw | An inclines plane that is wrapped in a spiral |
| Wheel and Axle | A simple machine consisting of two circular objects of different sizes |
| Pulley | A simple machine consisting of a grooved wheel that holds a rope or cable |
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