Lego EV3 Gears

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

• increases
• decreases
• stays constant

A gear ratio is defined as which of the following?

• Teeth of gear : teeth of gear
• gear shape : gear shape
• Speed : torque

When gears are equal in size, what happens to the speed and torque?

• Speed increases; torques decreases
• Speed decreases; torque increases
• Speed and torque are constant

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

• 1:2
• 1:3
• 2:5
• 1:1

On your robots, if a large gear is attached to the motor and a smaller gear is attached to the wheel, what happens?

• The smaller gear turns faster than the large gear and the speed of the robot increases (and torque decreases).

• Both gears turn at the same speed.

• The smaller gear turns slower than the large gear and the speed of the robot decreases (and torque increases).

On your robots, if a small gear is attached to the motor and a larger gear is attached to the wheel, what happens?

• The larger gear turns faster than the small gear and the speed of the robot increases (and torque decreases).

• Both gears turn at the same speed.

• The larger gear turns slower than the small gear and the speed of the robot decreases (and torque increases).

What is one purpose of idler gears

• Change the gear ratio

• Change the total power available at the output gear

• Change the rotational direction of the output gear

• Change the rotational speed at the output gear

The driven gear is the gear attached to the wheel of your EV3

• True

• False

The driving gear is the gear attached to the EV3 motor

• True

• False

Besides gears, another item that can affect the speed of the robot is...

• The axle length

• Direction of the motor

• Number of sensors

• Diameter of the wheels