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# Simple Machines Concepts (Grades 11-12)

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## Simple Machines Concepts

Instructions: Use the concepts in the word bank to fill-in the missing information for each of the ten statements below. Be sure to read each statement carefully.

WORD BANK

ramp$" "$ wedge$" "$ screw$" "$ tension$" "$ efficiency$" "$ output force$" "$ lever$" "$ fulcrum$" "$ gear$" "$ machine$" "$output arm$" "$ wheel and axle$" "$ gear ratio$" "$ input force$" "$ ideal mechanical advantage$" "$ block and tackle$" "$ mechanical advantage
1.
Real-world machines generate less output force than ideal machines because the                            is usually less than 100%.
2.
The gear and rear tire of a multiple-speed bicycle is an example of a                                   .
3.
The ratio of the radius of a wheel to the radius of its axle is the                                                            of that wheel-and-axle system.
4.
The switchbacks of a road going up the side of a mountain are an example of a/an               .
5.
A wheel with 42 teeth was turned, causing a wheel with 14 teeth to turn. The system has a/an                            of three.
6.
When you use a crowbar to remove a nail from a piece of wood, the distance from the crowbarâ€™s pivot point to the nail is the                           .
7.
The ratio of the output force to the input force is called the                                               .
8.
When mules turn the wheel of a wheel and axle system, the axle delivers the                               .
9.
When a spike is pounded into a railroad tie using a sledgehammer, the sledgehammer provides the                             .
10.
When you turn a/an                 , it converts the rotational motion into translational motion into the material.
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