Lesson 1 Mechanisms PLTW A&R

A simple gear train is a mechanical system consisting of:

• a single gear

• two or more gears meshed together

• a gear and a belt

• a gear and a chain

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

• True

• False

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Fill in the blank: If the gears have the same number of teeth, the speed and torque are ________.

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

• It changes the direction of rotation.

• It increases the speed of rotation.

• It decreases the speed of rotation.

• It has no effect on the direction of rotation.

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What is the angular range of a universal joint?

• 90° to 270°

• 0° to 90°

• 270° to 360°

• 180° to 360°

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

• True

• False

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What does a universal joint allow the shafts to do?

• Move in a wide range of angles

• Rotate only in one direction

• Stay fixed in one position

• Move in a straight line

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

• The parts move independently without any coordination.

• The parts work together to transmit torque and rotational motion.

• The parts are static and do not interact with each other.

• The parts are designed to restrict movement and prevent rotation.

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What is the primary function of a bevel gear?

• To change rotational motion at an angle.

• To increase speed of rotation.

• To decrease speed of rotation.

• To transmit power in a straight line.

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How does a bevel gear transmit power?

• It transmits power between two planes.

• It transmits power in a straight line.

• It transmits power at a right angle.

• It transmits power through friction.

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