PLTW: Gear Ratios

What's the ratio?

Make sure ratio is reduced

• 1:1

• 84 : 60

• 60 : 36

• 5 : 3

# of teeth output gear = 30

# of teeth input gear = 60

What is the gear ratio (in lowest terms)?

• 1 : 2

• 30 : 60

• 2 : 1

• 60 : 30

When gears are equal in size, what is the gear ratio?

• There is no gear ratio when sizes are equal

• 1:3

• 2:5

• 1:1

If the pink gear is the input gear and the blue gear is the output gear, what will happen with speed and torque?

• increase speed, decrease torque

• decrease speed, increase torque

• speed & torque remain constant

• No mechanical advantage

When speed increases, what happens to the value of torque?

• increases
• decreases
• stays constant
• No mechanical advantage

A 36 tooth driving gear (connected to the motor) is moving a 12 tooth driven gear. What is the gear ratio?... It has a speed advantage.

• 3:1

• 1:3

• 3:3

• 1:1

What is the gear ratio with a driving gear with 40 teeth and a driven gear with 8 teeth?

Make sure ratio is reduced to lowest terms

• 8 : 40

• 1 : 5

• 5 : 1

• 40 : 8

When a input gear is larger than a output gear you have.....

• Increased Speed

• Increased Torque

• Decrease speed

• No mechanical advantage

A 12 Tooth driving gear (connected to the motor) is connected to a 36 tooth driven gear. What is the gear ratio and mechanical advantage?

• 3 : 1 Torque Advantage

• 3 : 1 Speed Advantage

• no Mechanical Advantage

• 1 : 3 Torque Advantage

On the illustration, the number of the gear A teeth are 12, and the number of the gear B teeth are 48. Select one which shows correct gear ratio.

• 48 : 12

• 12 : 48

• 1 : 4

• 4 : 1