Lesson 1 Mechanisms PLTW A&R

Front

A simple gear train is a mechanical system consisting of:

Back

two or more gears meshed together

Front

To increase speed in a simple gear train, the input (driving) gear needs to have more teeth than the output (driven) gear.

Back

True

Front

If the gears have the same number of teeth, the speed and torque are ________.

Back

constant

Front

What role does the idler gear play in a simple gear train with idler?

Back

It changes the direction of rotation.

Front

What is the angular range of a universal joint?

Back

90° to 270°

Front

A universal joint is a flexible mechanism that connects two rotating shafts at an angle to each other.

Back

True

Front

What does a universal joint allow the shafts to do?

Back

Move in a wide range of angles

Front

Examine the Universal Joint Model and explore how the parts in the mechanism work together. Which of the following best describes your observations?

Back

The parts work together to transmit torque and rotational motion.

Front

What is the primary function of a bevel gear?

Back

To change rotational motion at an angle.

Front

How does a bevel gear transmit power?

Back

It transmits power between two planes.