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| Allison raises a bucket from inside of a well by turning the handle at the end of this simple machine. |
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| A machine that is made of two or more simple machines is called a ______________ machine. |
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| Which simple machine is the gear based on? |
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| If you want two gears to turn in the same direction, then you must use at least ___ gears. |
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| This is the process of making smaller and smaller machine parts. |
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| This is defined as the science and technology of building circuits and devices from single atoms and molecules. |
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| are designed to do things that we cannot do. |
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| On TV robots look like people. In real life they do not, since they... |
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| C. hacking into computers. |
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Plans for nanomachines in the future include all of the following except--
A. jobs inside our bodies.
B. military uniforms that change color.
C. hacking into computers.
D. creating water-repelling materials. |
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| This is any device that helps people do work. |
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Machines make work easier by
A. increasing the distance over which work is done.
B. A only
C. changing the direction of the force.
D. Both A and C |
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| For a machine to be effective, the output force should always be _________________ the input force. |
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| This is the number of times that a machine multiplies input force. |
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| _________________ is the ratio of a machine’s output work to its input work (times 100). |
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| An ideal machine would be ______________ efficient. |
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| A car engine has an efficiency of ____________. |
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| D. adding more parts to the machine |
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Which of the following would NOT be a good way to increase efficiency?
A. changing engine oil
B. greasing a bike chain
C. properly inflating tires
D. adding more parts to the machine |
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| All machines lose some heat energy from the force of |
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Which of the following is NOT one of the six simple machines?
A. wedge
B. screw
C. nail
D. pulley |
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| The fixed point on which a lever works is called a |
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| With a first class lever, the _______________ is in the middle. |
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| A stapler is an example of a __________________ lever. |
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| A wheelbarrow is an example of a ___________________ lever. |
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| With a second class lever, the ________________ is in the middle. |
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| With a third class lever, the ________________ is in the middle. |
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Which of the following would be an example of a simple machine?
A. scissors
B. skateboard wheels
C. toaster
D. Jaws of Life |
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| A pulley helps you to do work by changing the _________________ of the force. |
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| A sliding board is an example of this type of simple machine. |
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| When Ryan’s dad uses an ice scraper to clear his windshield, he is using this simple machine. |
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