Simple Machines Quiz

Grade 3 · Science · Quiz

Test your knowledge of the six types of simple machines and how they make work easier.

Questions

1. Which simple machine is a ramp that helps move things from a lower place to a higher place?

   1. Lever
   2. Pulley
   3. Inclined plane
   4. Wedge
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   Answer: Inclined plane

   An inclined plane is a flat slanted surface (ramp). It lets you push something up gradually instead of lifting it straight up, reducing the force needed.

2. A see-saw on a playground is an example of which simple machine?

   1. Wedge
   2. Lever
   3. Pulley
   4. Screw
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   Answer: Lever

   A see-saw is a lever. It has a beam balanced on a fixed point (fulcrum). Pushing one side down lifts the other side up.

3. Simple machines always make work require more force.

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   Answer: False

   Simple machines make work easier by reducing the amount of force needed. You might use less force but move something over a greater distance.

4. A doorknob is an example of which simple machine?

   1. Lever
   2. Wedge
   3. Wheel and axle
   4. Pulley
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   Answer: Wheel and axle

   A doorknob is a wheel and axle. The round knob is the wheel; the spindle inside is the axle. Turning the large wheel requires less force than turning the small axle directly.

5. Which simple machine is used to lift a flag up a flagpole?

   1. Screw
   2. Pulley
   3. Inclined plane
   4. Lever
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   Answer: Pulley

   A flagpole uses a pulley — a wheel with a rope around it. Pulling one end of the rope down raises the flag up.

6. A knife and an ax are examples of a simple machine called a ___.

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   Answer: wedge

   A wedge is a simple machine with a pointed or sharp edge used to push things apart. Knives and axes are wedges that split or cut materials.

7. A screw is actually an inclined plane wrapped around a pole.

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   Answer: True

   A screw is an inclined plane (ramp) wrapped in a spiral around a cylinder. As you turn it, the ramp pushes the screw forward through material.

8. What is the fixed point that a lever rests on called?

   1. Load
   2. Effort
   3. Fulcrum
   4. Axle
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   Answer: Fulcrum

   The fulcrum is the pivot point a lever rests on. Moving the fulcrum changes how much force is needed to lift a load.

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