PLTW Mechanisms

What is the primary function of a gear in a mechanical system?

• To increase speed

• To change direction

• To transmit torque

• To reduce friction

In a lever system, what is the term for the point where the lever pivots?

• Fulcrum

• Load

• Effort

• Beam

Which of the following mechanisms is used to convert rotary motion into linear motion?

• Gear

• Pulley

• Cam

• Lever

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What is the mechanical advantage of a pulley system with two pulleys?

• 1

• 2

• 3

• 4

In a gear train, if the driving gear has 20 teeth and the driven gear has 40 teeth, what is the gear ratio?

• 1:2

• 2:1

• 1:1

• 1:4

Which type of lever is a seesaw an example of?

• First-class lever

• Second-class lever

• Third-class lever

• Fourth-class lever

What is the purpose of a flywheel in a mechanical system?

• To store energy

• To increase speed

• To reduce noise

• To change direction

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In a hydraulic system, what principle explains the transmission of force through a fluid?

• Pascal's Principle

• Bernoulli's Principle

• Archimedes' Principle

• Newton's Third Law

Which mechanism is commonly used in clocks to regulate time?

• Pendulum

• Gear

• Spring

• Cam

What is the function of a camshaft in an internal combustion engine?

• To open and close valves

• To increase fuel efficiency

• To reduce emissions

• To cool the engine