PLTW Gears/Mechanisms

A force in a circular direction

• rotary
• Torque

A comparison of the number of teeth of one gear to another.

• gear total
• gear purpose
• gear ratio 

Movement in a circular motion

• Rotary 
• Oscillating
• Linear
• Reciprocating

Movement that goes back and forth in a straight line

• Rotary
• Linear
• Oscillating
• Reciprocating 

Movement along an arched path; back and forth

• rotary
• oscillating
• reciprocating
• linear

The gear train in which diagram provides more torque?

• A
• B

Which gear train would you use to ride up a hill?

• A
• B

What happens to speed
when you increase torque?

• Speed Increases
• Speed decreases
• Speed stays the same

The input gear has 6 teeth.
The output gear has 48 teeth.  The gear ratio is...

• 1:8
• 8:1
• 6:48

What is the best explanation for a gear train with a 7:1 gear ratio?

• The drive gear turns 1 time for every 7 turns of the driven gear.
• The driven gear turns 7 times for 1 turn of the drive gear.
• The gear goes fast!