Gear Ratios Lockwood Goulart Norwood Science Center Date

Gear Ratios Lockwood & Goulart Norwood Science Center

Date: Title: Purpose: ______ Gear Ratios Which gear spins faster? Why?

A Little Review FORCE: a push or a pull THE LOAD: object moved THE EFFORT: moves load

A Ratio Two values related by division Also known as…. . A fraction!

Fractions may be written as 3 4 ¾

Gear Size Ratio Circumference Effort gear Circumference Load gear

An Example Effort gear has 30 teeth Load gear has 10 teeth

Size ratio 30 teeth 10 teeth

Size ratio 30 teeth 10 teeth 30 10 3 1

One important thing… Always leave as a fraction, even if the denominator is 1!

Spin ratio # turns Effort gear # turns Load gear

Effort gear spins one (1) time Load gear spins three (3) times

Spin ratio # turns 1 Effort spin gear # turns 3 spins Load gear

Size ratio 3 1 Spin ratio 1 3

Size Ratio Spin Ratio 3 1 1 3 Size Ratio

Size ratio Spin ratio 3 1 2 1 3 1 2 2 1

What is the relationship between Spin ratio and Size ratio? Flipped Upside Down Reverse Opposite Topsy Turvy Inverse Reciprocal Backwards

Gears Are Like People Little Ones Have To Move Faster To Keep Up with The Big Ones

http: //cache 1. assetcache. net/xc/1013206 45. jpg? v=1&c=IWS Asset&k=2&d=91 F 5 CCEF 208281 FDE 4 D 6 FE 513 A 5 DAEA 23 BCCA 476 CC 5 EBE 4 1 C 34 D 4 AEAED 6 FC BB 2

Purpose- Which gear spins faster? Why? A smaller gear spins faster than a larger gear. The reason why is…

Gear ratio of a bicycle Link to Gear Ratios Site

Gear Ratios Lockwood & Goulart Norwood Public Schools