Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Work and Machines
This is a review over chapter 13 in the Physical Science 6th edition textbook.
| Question/Term | Answer/definition |
|---|---|
| Define Work | The energy transferred to an object when an external force act on the object to move it. |
| What is the formula for work? | W=Fd |
| Define Power | The rate of doing work |
| What is the formula for Power? | P= W/t |
| What do we measure work in? | Joules |
| What do we measure power in? | Watts |
| Define simple machines | basic mechanical devices that change the magnitude, direction, or distance traveled of the force used when doing work. |
| What are the three most general types of simple machines? | Lever; wheel and axle; inclined plane |
| Define mechanical advantage | the measure of the change in the input needed to do a certain amount of work when using a simple machine |
| Define Ideal Mechanical advantage (IMA) | The measure of mechanical advantage for an ideal machine-- 100% efficient with no friction. It is the ratio of the input distance to the output distance. |
| Define Actual mechanical advantage (AMA) | The meachanical advantage takinginto account all mechanical losses sustained throught the machine. It is the ratio of the output force to the input force. |
| Define efficiency | the effectiveness of a machine or process at converting energy from one form to another. |
| Define Lever | A simple machine that consists of a rigid bar that turns about a pivot point. |
| Define fulcrum | The pivot point at which the lever turns. |
| Define torque | Any force that tries to cause an object to rotate around its axis. |
| Efficiency formula | (W out/W in)100% or (AMA/ IMA)100% |
| Describe a second class lever | The fulcrum is located at the front of the lever. and the force in and out both acts in an upward motion. |
| Describe a third class lever | The fulcrum is located at the front of the lever, and the force in and out both act in a downward motion. |
| Describe a first class lever | The fulcrum is located in the middle of the lever, and the force out is acting upwards, and the force in is acting downwards. |
| Define Wheel and axle | A simple machine consisting of a wheel with a rod running through its axis that acts as the pivot point. |
| Define gear | A common variation on the wheel and axle that consists of a wheel with teeth around its perimeter that mesh will teeth on other gears to do work while producing rotational motion. |
| What is the IMA formula for gears? | TEETH in/ TEETH out |
| Define pulley | A simple machine that consists of a wheel- and- axle system with a groove around the perimeter of the wheel in which a rope, cable, or belt moves with the wheel as it rotates. |
| What are the different types of pulleys? | Single pulley, movable pulley, and a block and tackle |
| Define inclined plane | a simple machine consisting of a flat surface whose opposite ends are at different heights |
| Define wedge | an inclined plane consisting of two planes connected with an acute angle that is thick at one end and thinner at the other. |
| Define screw | An inclined plane that is wrapped around a cone or cylinder in a spiral pattern. |
| Define compound machine | A machine consisting of a combination of two or more simple machines. |
Created by:
hihello2007
Popular Physical Science sets