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Simple Machine Unit
Mrs. Brandt's 8th Grade Science
| Question | Answer |
|---|---|
| - What is the work output of a machine divided by the work input? | efficiency |
| -What is the ratio of output force to input force; tells you how much the machine multiplies the input force? | Mechanical Advantage |
| -What device does work with only one movement? | Simple Machine |
| -What is the force that you apply to a simple machine? | input (effort) force |
| -What is the device that is made up of more than one simple machine? | compound machine |
| -What is the force that simple machines apply to an object? | output (resistance) force |
| -What do simple machines make easier? | work |
| -What is the pivot point of a lever? | fulcrum |
| -How is a block easier to lift using the fixed pulley? | changes the direction of the force needed to move an object |
| -What is an inclined plane? | a slanted surface that is used to raise an object |
| -What is a lever? | a bar that is free to pivot about a fixed point |
| -What is a wedge? | It is an inclined plane with one or two sloping sides used for cutting or prying. |
| -What is a screw? | It is an inclined plane wrapped around a cylinder post. |
| -Name the 6 simple machines. | lever, pulley, wheel and axle, wedge, inclined plane, screw |
| -Describe the block and tackle. | It is an arrangement of pulleys designed to greatly reduce the effort force. |
| -Name the two simple machines that are in a pencil sharpener. | wheel and axle & wedge |
| -Most machines require a small input force over a large input distance to get what? | A large force over a small distance |
| -Why is the amount of work output from a machine never as large as the work put into the machine? | friction |
| -If the mechanical advantage of a machine is 4, what is the output force? | The machine multiplies the input force by 2. |
| -Name three ways that machines make work seem easier. | increasing the output force, increasing the input distance, changing direction or changing the speed |
| -Why does adding oil to the moving parts of a machine increase its efficiency? | It lessens the friction and gets more work out and more force out. |
| -Why is it easier to pry a nail out of a board with long handled hammer than with a short handled hammer? | Because there is a bigger mechanical advantage. |
Created by:
mtoutant
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