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Eighth Grade (Grade 8) Simple Machines Questions

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Grade 8 Simple Machines
A                 changes the direction of the input force.
  1. fixed pulley
  2. movable pulley
Grade 8 Simple Machines
A wheelbarrow is an example of a                   .
  1. second-class lever
  2. wheel and axle
  3. inclined plane
Grade 8 Simple Machines
A(n)                 is a flat surface, a sloped surface, or a ramp.
  1. pulley
  2. wheel and axle
  3. inclined plane
  4. lever
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
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
A pulley makes work easier by
  1. increasing force.
  2. increasing distance.
  3. changing the direction of force.
  4. none of the above.
Grade 8 Simple Machines
An object being lifted or moved by a machine is
  1. a fulcrum.
  2. a load.
  3. work.
  4. force.
  5. friction.
Grade 8 Simple Machines
The ratio of output force to input force is known as                     .
  1. power
  2. mechanical advantage
  3. efficiency
  4. pressure
Grade 8 Simple Machines
A machine with a bar that pivots on a fixed point is called a(n)
  1. watt.
  2. pulley.
  3. wheel and axle.
  4. lever.
Grade 8 Simple Machines
A                 can be used to multiply force and change direction.
  1. lever
  2. wheel and axle
  3. pulley
  4. screw
Grade 8 Simple Machines
Comparing a machine's work output with work input refers to
  1. a watt.
  2. mechanical efficiency.
  3. mechanical advantage.
  4. a joule.
Grade 8 Simple Machines
A machine can change the magnitude of a force.
  1. True
  2. False
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