AR 1.6 - Time to Switch Gears

If you want to lift a heavy object with a motor, how should you adjust the gears to increase torque?

• Use a larger output gear

• Use a smaller output gear

• Use the same size input and output gears

If a driving gear has 60 teeth and the driven gear has 20 teeth, what is the gear ratio based on the number of teeth?

• 1:3

• 3:1

• 1:1

• 1:2

A gear train consists of a driving gear with 48 teeth and a driven gear with 24 teeth. What can you conclude about the gear ratio?

• The gear ratio is 1:2

• The gear ratio is 2:1

• The gear ratio is 1:1

• The gear ratio is 3:2

In a gear train, if the driving gear has 50 teeth and the driven gear has 25 teeth, what is the gear ratio based on the number of teeth?

• 1:2

• 2:1

• 1:1

• 5:1

What does a gear ratio compare in a gear system?

• The number of rotations between the driving and driven gears

• The torque of the entire system

• The size of the gears

• The speed of the smallest gear compared to the size of the entire structure

In a gear system, if the driving gear rotates faster than the driven gear, what is most likely true?

• The driven gear is larger

• The driven gear is smaller

• The gears are the same size

• The driving gear has more teeth

What conclusion can be drawn about the relationship between speed and torque in a gear train?

• Speed and torque are inversely related

• Speed and torque are directly related

• Speed increases torque without any changes

• Torque only changes with the motor size

In a system where the output gear is smaller than the input gear, what will likely happen to the output torque?

• The output torque will decrease

• The output torque will increase

• The output torque will stay the same

• The output torque will double

What would happen to the torque if the number of teeth on the input gear is 60 and the number of teeth on the output gear is 24?

• The torque will decrease

• The torque will increase

• The torque will stay the same

• The torque will reverse

Imagine a robotic arm build with a motor but no gear train. Why would it not be able to lift the heavy arm?

• The motor does not have enough torque

• The motor does not have enough speed

• The motor is not connected properly

• The motor’s gears are too small