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Science ch 16
Science Ch 16
| Question | Answer |
|---|---|
| using force – pushing or pulling – in order to move an object a certain distance | Work |
| any device that helps people do work | Machine |
| tool made up of one or two parts | Simple Machine |
| contains one or more simple machines among its parts | Compound Machine |
| An example of _____________ is pulling weeds out of a garden | Work |
| No matter how much force you use, if something ___________, you haven’t done work | doesn’t move |
| Explain how the formula for work relates to the scientific definition of work. | To find out how much work is done, use this formula Work = force x distance This formula shows that work means using force to move an object a certain distance |
| Work is measured in a unit called the ________ 1 joule = 1 newton (N) x 1 meter (M) | joule |
| Salad Tongs are an example of a _____________ | simple machine |
| When putting a lid on a jar it does not matter if you slam the lid on or screw the lid on, both require | the same amount of work |
| The amount of work a machine does is less than the amount of work put into it because_____________________________ | some work is lost to friction |
| People who design machines try to reduce the friction between the machine’s parts. Explain why they do this and identify two ways you can reduce friction in machines. | Reducing friction makes machines more efficient. Using lubricants like oil, wax and grease on machine parts is one way to reduce friction. Using wheels, rollers or balls is another method. |
| the support on which a lever rests while moving or lifting an object | Fulcrum |
| a force applied to the end of a lever to lift a load | Effort Force |
| force of an object on a lever | Load |
| A ______________ is related to an inclined plane | shovel |
| the fulcrum is in the middle | In a First-Class Lever |
| An example of a _____________ is a baseball bat | Third-Class Lever |
| If the fulcrum is closer to the load, ____________________ will be required to move the load | less force |
| The ______________is a modified inclined plane | screw |
| A __________________ is a simple machine made of two or more inclined planes. | wedge |
| The slanted edges of the inclined planes come to a ______________________ | point, or angle |
| Why is it important that the diameter of the wheel be greater than the diameter of the axle? | The wheel turns a greater distance than the axle, which makes the axle more powerful. If the wheel were the same diameter as the axle, the turn of the axle would not be any more powerful than the turn of the wheel. |
| A fixed pulley makes work easier by changing _____________________________ | the direction of the force |
| Identify a compound machine you use and at least two simple machines that are in the compound machine. | A bicycle is a compound machine. It has levers for handbrakes and wheels and axles for the tires and pedals. |
| On a sailboat, the triangular jib sail acts as an _____________________ | inclined plane |
| A winch cranks rope in and out, this is an example of a | wheel and axle |
Created by:
Twehues56
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