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Eighth Grade (Grade 8) Simple Machines Questions

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Grade 8 Simple Machines
Look at the image of the pulley. If bucket A has a mass of 5 kg, which of the following statements is true about the minimum effort force required to lift the bucket if friction is ignored?
Pulley System
  1. it would take 0 kg of effort to lift the bucket
  2. it would take 2.5 kg of effort to lift the bucket
  3. it would take 5 kg of effort to lift the bucket
  4. it would take 10 kg of effort to lift the bucket
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
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
Machine with a bar that pivots on a fixed point
  1. watt
  2. pulley
  3. wheel and axle
  4. 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
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 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
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.
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