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Eighth Grade (Grade 8) Simple Machines Questions

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Grade 8 Simple Machines
What are two examples of an inclined plane?
  1. lever and screw
  2. screw and wedge
  3. wedge and lever
Grade 8 Simple Machines
Grade 8 Simple Machines
An object being lifted or moved by a machine is a:
  1. fulcrum
  2. load
  3. work
  4. force
  5. friction
Grade 8 Simple Machines
Grade 8 Simple Machines
Machine with a bar that pivots on a fixed point
  1. watt
  2. pulley
  3. wheel and axle
  4. lever
Grade 8 Simple Machines
Comparing a machine's work output with work input
  1. watt
  2. mechanical efficiency
  3. mechanical advantage
  4. joule
Grade 8 Simple Machines
What is the work done by a machine on an object?
  1. power
  2. work input
  3. work output
  4. lever
Grade 8 Simple Machines
What is the formula for mechanical advantage?
  1. input force divided by output force
  2. output work divided by input work
  3. output force divided by input force
Grade 8 Simple Machines
A wheelbarrow is an example of
  1. second-class lever
  2. wheel and axle
  3. inclined plane
Grade 8 Simple Machines
What is the purpose of a simple machine?
  1. So we can do less work
  2. To create energy
  3. To make work easier
  4. To create friction
Grade 8 Simple Machines
How do you increase the mechanical advantage of an inclined plane?
  1. Increase the height of the inclined plane.
  2. Increase the output force.
  3. Decrease the length of the inclined plane.
  4. Increase the length of the inclined plane.
Grade 8 Simple Machines
How do you increase the Mechanical Advantage of a lever?
  1. Move the fulcrum closer to the output force.
  2. Move the fulcrum closer to the input force.
  3. Increase the output force.
  4. Put the fulcrum equal distance from the output and input forces.
Grade 8 Simple Machines
Grade 8 Simple Machines
Which of the following describes something simple machines CANNOT do.
  1. increase the force you put in
  2. increase the work you put in
  3. decrease the force you put in
  4. decrease the work you put in
Grade 8 Simple Machines
What can machines NOT do?
  1. make work easier
  2. create more work than you put in
  3. change your force
  4. change the direction of your force
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