# Chapter 14 Vocab

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 Author: adamah115 ID: 107793 Filename: Chapter 14 Vocab Updated: 2011-10-10 15:01:46 Tags: adamharper sci Folders: Description: Forces and Simple Machine Show Answers:

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1. Grooved wheel with a rope or cable wrapped over it.
• Pulley
2. two circular objects of different sizes that are attached in such a way that they rotate together
• Wheel and Axle
3. any rigid rod or plank that pivots, or rotates, about a point.
• Lever
4. an inclined plane wrapped around a cylinder or post.
• Screw
5. an inclined plane that moves
• Wedge
6. a flat, sloped surface
• inclined plane
7. a combination of simple machines
• Compound Machine
8. a machine that works with only one movement
Simple Machine
9. the ratio of the output work to the input work. calculated from this equation
Workout divided by Workin x 100%
Efficiency (eff)
10. The ratio of the output force to the input force
Calculated by:
Force(out) divided by Force(in)
11. the force the machine applies
Output Force
12. the work you apply on the machine
Input Force
13. how quickly work is done can be calculated by:

work
(in joules) divided by time (in seconds)

and is measured in WATTS
Power
14. Done when a force causes an object to move in the same direction that the force is applied. It is measured in joules
Can be calculated as:

force (in newtons) X Distance (in meters)
Work

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