Mechanical Levers and Their Applications
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Questions and Answers

What is a lever primarily used for?

  • To create friction
  • To spin or rotate objects
  • To change the direction of force
  • To lift and move heavy objects (correct)

    • A screwdriver and a teeter-totter are both classified as levers.

    True (A)

    What should you consider when adapting items for an older person or someone with a disability?

    Ease of use and safety.

    A lever changes the amount of _____ you must exert to move an object.

    <p>force</p> Signup and view all the answers

    In terms of mechanical devices, which of the following is a benefit of using levers?

    <p>They allow for moving heavier objects with less effort (C)</p> Signup and view all the answers

    Match the following terms with their correct definitions:

    <p>Lever = A simple machine that changes the amount of force required to lift an object Inclined Plane = A flat surface tilted at an angle used to raise objects Leverage = The mechanical advantage gained by using a lever Screwdriver = A tool that operates on the principle of a lever to exert force</p> Signup and view all the answers

    The term 'leverage' refers only to the physical usage of a lever.

    <p>False (B)</p> Signup and view all the answers

    What is one example of an object you could adapt for people with physical limitations?

    <p>A door handle.</p> Signup and view all the answers

    What class of lever is represented by the calf muscle lifting a load of 600 N?

    <p>Class 2 (B)</p> Signup and view all the answers

    The triceps muscle acts as a Class 1 lever.

    <p>False (B)</p> Signup and view all the answers

    What does the Canadarm resemble in terms of functionality?

    <p>A human arm</p> Signup and view all the answers

    The hand is lifting a ____ kg object using the biceps muscle.

    <p>15</p> Signup and view all the answers

    Match the following muscles with their respective lever classes:

    <p>Calf muscle = Class 2 Biceps muscle = Class 3 Triceps muscle = Class 3</p> Signup and view all the answers

    What technology primarily utilizes gears and levers in outer space?

    <p>Canadarm (D)</p> Signup and view all the answers

    The Space Station Mobile Servicing System is designed to assist with repair jobs in space.

    <p>True (A)</p> Signup and view all the answers

    What load force is applied by the hand when using the triceps muscle to pull on a rope?

    <p>30 N</p> Signup and view all the answers

    What was one of the primary missions of the Canadarm?

    <p>Repairing the Hubble Space Telescope (D)</p> Signup and view all the answers

    The Hubble Space Telescope can see farther and more clearly than any ground-based optical telescope.

    <p>True (A)</p> Signup and view all the answers

    Which of the following is a simple machine?

    <p>Pulley (C)</p> Signup and view all the answers

    What is the primary function of the Space Station Mobile Servicing System?

    <p>To assist in assembling and maintaining the International Space Station.</p> Signup and view all the answers

    Weight is a __________, and it is measured in units called newtons (N).

    <p>force</p> Signup and view all the answers

    A wedge is used to lift heavy loads.

    <p>False (B)</p> Signup and view all the answers

    What is the purpose of a wheel and axle?

    <p>To transfer the rotation of one to the other.</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Mass = Amount of material in an object Weight = Gravitational force acting on an object Canadarm = Robotic arm used for space missions Hubble Space Telescope = Orbiting telescope for deep space observation</p> Signup and view all the answers

    How long is the arm of the Space Station Mobile Servicing System when stretched out?

    <p>17 m (C)</p> Signup and view all the answers

    A ______ is a simple machine that supports a rope, cable, or chain.

    <p>pulley</p> Signup and view all the answers

    Mass is measured in newtons and weight is measured in kilograms.

    <p>False (B)</p> Signup and view all the answers

    Match the type of lever with its example:

    <p>Class 1 Lever = Scissors Class 2 Lever = Seesaw Class 3 Lever = Hammer</p> Signup and view all the answers

    What type of simple machine is formed by two inclined planes joined back to back?

    <p>Wedge (B)</p> Signup and view all the answers

    List one of the sixteen countries involved in the planning and assembling of the International Space Station.

    <p>Canada</p> Signup and view all the answers

    Class Three levers have the fulcrum at the end.

    <p>False (B)</p> Signup and view all the answers

    What are compound machines?

    <p>Machines that combine multiple simple machines together.</p> Signup and view all the answers

    What is one benefit of using a wheel-and-axle device?

    <p>Gaining a mechanical advantage (C)</p> Signup and view all the answers

    The wheel and axle rotate at different speeds.

    <p>False (B)</p> Signup and view all the answers

    What is a gear train?

    <p>A group of two or more gears that work together.</p> Signup and view all the answers

    A driver gear turns and causes the ______ gear to rotate.

    <p>follower</p> Signup and view all the answers

    What is the purpose of using gears in mechanical systems?

    <p>To transfer motion and change speeds (D)</p> Signup and view all the answers

    A clock has different gears that rotate at the same speed.

    <p>False (B)</p> Signup and view all the answers

    What happens when the first gear in a gear train turns?

    <p>The second gear turns due to the teeth interlocking.</p> Signup and view all the answers

    Match the following components with their descriptions:

    <p>Driver gear = The gear that is turned to initiate motion Follower gear = The gear that is turned by the driver gear Wheel = The larger component in a wheel-and-axle Axle = The smaller component around which the wheel rotates</p> Signup and view all the answers

    What is work defined as in this context?

    <p>A transfer of energy (D)</p> Signup and view all the answers

    Energy can be created and destroyed.

    <p>False (B)</p> Signup and view all the answers

    What type of energy is associated with the pedals of a bicycle when they move?

    <p>kinetic energy</p> Signup and view all the answers

    Stored energy is also called _____ energy.

    <p>potential</p> Signup and view all the answers

    Which of the following is a common source of energy for machines?

    <p>Chemical energy (B)</p> Signup and view all the answers

    Match the types of energy with their definitions:

    <p>Kinetic Energy = Energy of motion Potential Energy = Stored energy Chemical Energy = Energy from food and fuels Gravitational Potential Energy = Energy due to height</p> Signup and view all the answers

    What type of energy do you gain from lifting a ball to a high level?

    <p>Potential Energy (B)</p> Signup and view all the answers

    The energy that powers the combine in farming comes from __________.

    <p>fuels such as gasoline</p> Signup and view all the answers

    Study Notes

    Simple Machines

    • Machines help use energy more effectively to do work
    • Early machines were simple tools to make tasks easier; examples include moving heavy rocks, or lifting materials to higher places
    • These early machines relied on people or animals for energy

    Six Types of Simple Machines

    • Inclined plane (ramp)
      • An angled surface
      • Used to move loads up or down a horizontal distance
    • Wedge
      • Two inclined planes joined back to back
      • Used to separate objects or hold an object in place
    • Screw
      • Cylindrical wedge with an inclined plane wrapped around it
      • Used to move materials or fasten materials together
    • Wheel and Axle
      • Larger-diameter wheel attached to a smaller-diameter cylinder
      • Rotation of one transfers to the other
    • Pulley
      • A wheel and axle that supports a rope, cable, or chain
      • Used to move loads vertically or change the direction of a force
    • Lever
      • A beam that pivots around a fulcrum to help move a load
      • The fulcrum sits between the force and load
      • Used to change direction of force (e.g., push down on end, load moves up)

    Classes of Levers

    • Class 1 Lever
      • Fulcrum is between the effort and load
      • Examples: Scissors, see-saw
    • Class 2 Lever
      • Load is between the effort and fulcrum
      • Examples: Wheelbarrow, stapler
    • Class 3 Lever
      • Effort is between the load and fulcrum
      • Examples: Hockey stick, hammer

    Compound Machines

    • Combining multiple simple machines
    • Example: Scissors (lever and wedge)
    • Example: Bicycle

    Mechanical Systems and Energy

    • Mechanical systems (or machines) are made up of parts working together to perform a function.
    • Require an energy input to perform tasks, energy input differs depending on the design of the system.
    • Energy input is the type of energy used to power a machine.

    Types of Input Energy

    • Kinetic energy
      • Energy of movement
      • Required to work many machines
    • Chemical energy
      • Energy from breaking apart chemical bonds in fuel
      • Used by many modern machines to run
    • Electrical energy
      • Energy from electricity
      • Used by many household machines

    Analyzing Machines

    • Each part of a mechanical system contributes to its overall functioning.
    • When analysing a system, various levels of specificity need to be considered.
      • System: A complete device with an overall function
      • Subsystem: A collection of parts working together to perform a specific function.
      • Components: The individual parts that make up a mechanical system or subsystem.

    Calculating Work

    • Work = Force × Distance
    • Units: Work is in Joules (J) or Newton-meters (N⋅m), Force is in Newtons (N), and Distance is in meters (m).

    Mechanical Advantage

    • How much easier a machine makes work is called its mechanical advantage.
    • Mechanical advantage is the ratio of force produced by a machine compared to the force applied to the machine.
    • Formula: Mechanical Advantage = Load Force / Effort Force
    • MA > 1: Mechanical advantage present (less force to lift a load)
    • MA = 1: No mechanical advantage, but used to change direction
    • MA < 1: Negative mechanical advantage (more force to lift load), but job done faster over more distance.

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    Related Documents

    Simple Machines PDF

    Description

    This quiz explores the fundamental principles of levers, their classifications, and specific applications in adapting tools for individuals with disabilities. Additionally, it examines the role of levers in mechanical systems, such as the Canadarm and Space Station Mobile Servicing System. Test your knowledge and understanding of mechanical advantage and lever function!

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