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Questions and Answers
Which classes of levers are defined as Class 1, Class 2, and Class 3?
Which classes of levers are defined as Class 1, Class 2, and Class 3?
What is the characteristic of Class 1 levers?
What is the characteristic of Class 1 levers?
Fulcrum is in the middle, effort on one side, resistance on the other.
What is the characteristic of Class 2 levers?
What is the characteristic of Class 2 levers?
Resistance is in the middle.
What is the characteristic of Class 3 levers?
What is the characteristic of Class 3 levers?
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What is the definition of a lever?
What is the definition of a lever?
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What does the acronym 'fre, 123' refer to?
What does the acronym 'fre, 123' refer to?
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What is the formula for determining the head pressure difference between an intake and an output?
What is the formula for determining the head pressure difference between an intake and an output?
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What should you start with first in the test?
What should you start with first in the test?
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What are absolutes, and why should you be cautious with them?
What are absolutes, and why should you be cautious with them?
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What does the Recall and Comprehend Technical Information section include?
What does the Recall and Comprehend Technical Information section include?
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What does the Recall and Comprehend Verbal and Visual Information involve?
What does the Recall and Comprehend Verbal and Visual Information involve?
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What is a Gear Train?
What is a Gear Train?
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Power = 2pi x Speed (w) x Torque (nm)/60 and Torque = _____ .
Power = 2pi x Speed (w) x Torque (nm)/60 and Torque = _____ .
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What is a Pulley?
What is a Pulley?
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What is characterized by a Block and Tackle system?
What is characterized by a Block and Tackle system?
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Study Notes
Classes of Levers
- Three types of levers: Class 1, Class 2, and Class 3 based on the arrangement of fulcrum, effort, and resistance.
Class 1 Levers
- Fulcrum positioned in the middle between effort and resistance.
- Mechanical advantage can be greater or less than 1.
- Examples include seesaws, crowbars, and scissors.
Class 2 Levers
- Resistance is located in the middle, with effort applied on one side and fulcrum on the other.
- Mechanical advantage is always greater than 1.
- Common examples are wheelbarrows, nutcrackers, and car brake pedals.
Class 3 Levers
- Effort is in the middle, resistance is on one side, and fulcrum is on the opposite side.
- Mechanical advantage is always less than 1.
- Examples include tweezers and the human mandible.
Lever Definitions
- A lever is a machine comprising a beam or rigid rod pivoted at a fulcrum.
- Input force is referred to as effort, while output force is termed load or resistance.
"fre, 123" Mnemonic
- Aids in remembering the configuration of levers:
- Class 1: Fulcrum in the middle
- Class 2: Resistance in the middle
- Class 3: Effort in the middle
Head Pressure Formula
- 1 vertical foot equates to 0.433 psi.
- 1 psi corresponds to 2.31 vertical feet.
Overall Test Overview
- 30 minutes to read 2 essays, followed by a 2-hour limit to answer 100 questions.
- Watch 2 videos and answer 20 questions influenced by the content.
- Apply mechanical reasoning across 25 questions focusing on various mechanical concepts.
- Solve 20 mathematical problems covering diverse arithmetic topics.
- Recall technical information through 35 questions based on earlier essays and additional content.
Recommended Starting Subject
- Begin with the Recall and Comprehend Technical Information section, if permissible.
- If not, prioritize solving mathematical questions first.
Caution Against Absolutes
- Be wary of questions using absolutes like "never," "always," or "only."
- Such statements tend to be incorrect or misleading.
Recall Technical Information
- Involves reading essays and answering 35 questions, including some based on essay content.
- Notes are permitted only on the essay packet, not on other test materials.
Verbal and Visual Information Recall
- Consists of 20 questions derived from 2 short videos.
- Each video generates 7-10 questions, with no note-taking allowed during viewing.
Gear Train (Transmission)
- A mechanism of two or more interconnected gears producing mechanical advantage via gear ratios.
Speed, Torque, and Power Relationship
- Power calculation: ( \text{Power} = \frac{2\pi \times \text{Speed (w)} \times \text{Torque (nm)}}{60} )
- Torque calculation: ( \text{Torque} = \frac{60 \times \text{Power (kW)}}{2\pi \times \text{Speed (Rpm)}} )
Belt and Pulley Systems
- Comprise two or more pulleys connected by a belt.
- Mechanical advantage realized when pulleys have differing pitch diameters.
Definition of Pulley
- A pulley is a wheel on an axle designed for supporting movement and directional change of belts or cables.
Rope and Pulley System (Block and Tackle)
- Mechanical advantage is determined by the number of rope segments acting on the load.
- Odd mechanical advantages occur when the anchor knot is at the load; even where it anchors.
- Haul distance can be calculated by multiplying the distance by the mechanical advantage ratio.
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Description
Explore the three classes of levers in physics: Class 1, Class 2, and Class 3. This quiz delves into their definitions, examples, and mechanical advantages. Test your understanding of how these simple machines operate and their practical applications.
