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Eighth Grade (Grade 8) Simple Machines Questions

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Grade 8 Simple Machines
A machine can increase or decrease speed.
  1. True
  2. False
Grade 8 Simple Machines
Which of the following statements would be true about the lever shown if C was moved closer to A?
Third Class Lever
  1. The ideal mechanical advantage would increase.
  2. The ideal mechanical advantage would decrease.
  3. The ideal mechanical advantage would remain unchanged.
Grade 8 Simple Machines
Which distances should be divided in order to calculate the ideal mechanical advantage of the lever shown?
Second Class Lever
  1. BABC
  2. BCBA
  3. ACBA
  4. BAAC
Grade 8 Simple Machines
A                 is a machine used to hold two objects together.
  1. pulley
  2. lever
  3. inclined plane
  4. screw
Grade 8 Simple Machines
What is a machine with a grooved wheel that holds a cable?
  1. pulley
  2. lever
  3. wheel and axle
  4. wedge
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
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 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
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 bottle opener is an example of what type of simple machine?
  1. Screw
  2. Inclined Plane
  3. Wedge
  4. Lever
Grade 8 Simple Machines
Which of the following is not a simple machine?
  1. Golf Club
  2. Ramp
  3. Scissors
  4. Knife Blade
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
Grade 8 Simple Machines
What characteristic of simple machines is often expressed as a percentage?
  1. Work
  2. Power
  3. Efficiency
  4. Mechanical Advantage
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