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PS Ch 5 Rev
Review for Ch 5 Test
| Question | Answer |
|---|---|
| A slanted surface used to raise an object | Inclined Plane |
| A device that does work with only one movement and changes the size or direction of a force is a___. | Simple Machine |
| A bar that is free to pivot about a fixed point is a ___. | Lever |
| The rate at which work is done. | Power |
| _____ is transferred to an object when work is done. | Energy |
| The output work of a machine compared to the input work is the ____ of the machine. | Efficiency |
| The amount by which a machine multiplies an effort force is called the ____. | Mechanical Advantage |
| Two inclined planes put together form a simple machine called a ______. | Wedge |
| An inclined plane wrapped around a cylindrical post is a ____. | Screw |
| A machine that changes only the direction of a force has a mechanical advantage of ___. | One |
| What are two or more simple machines that work together called? | Compound Machine |
| The unit of power is ____. | Watts |
| The unit of work is ____. | Joule |
| A lever with a mechanical advantage greater than one is used to ____. | Increase Force |
| Three of the following machines are alike. Select the one that is different. Pulley, wedge, lever, wheel & axle. | Wedge |
| A system of pulleys designed to multiply the effort force is called a ___. | Block & Tackle |
| Two simple machines that are part of a bicycle are ____. | Gear and Wheel & Axle |
| The mechanical advantage of a single fixed pulley is always one because___. | they pulley changes only the direction of the effort force. |
| An example of a first class lever is a ____. | Seesaw |
| An example of a second class lever is a ____. | Wheelbarrow |
| An example of a third class lever is a ___. | Baseball Bat |
| An example of a fixed pulley is a _____. | Elevator |
| An example of a wheel & axle is a ____. | pencil sharpener |
| An example of an inclined plane is a ____. | Wheelchair ramp |
| An example of a screw is a _____. | Spiral staircase |
| An example of a wedge is a ___. | Axe |
| An example of a compound machine is a ___. | Can opener |
| An inventor claims to have built a machine that can produce 120J of work with an input of 110J. Would you believe the inventor's claim. Why or why not? | NO, because work output cannot be greater than work input. |
| Explain why adding oil to the moving parts of a machine can increase its efficiency. | It would reduce the amount of friction produced. |
| List 3 ways machines make doing work easier. | 1. Changes the direction of the force applied. 2. Increases the force that can be applied. 3. Increases the distance over which the force can be applied. |
| Is work being done if a person carries a heavy box across the room? Why or why not? | NO, because the force applied to the book is upward and that is not the direction that the books are moving. |
Created by:
jjones87
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