What is the primary purpose of a simple machine?

• To increase the amount of work done

• To change the magnitude and direction of force

• To create energy

• To reduce the weight of an object

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DOK Level 1: Recall

Which of the following is NOT considered a simple machine?

• Lever

• Pulley

• Engine

• Wedge

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DOK Level 1: Recall

Identify the simple machine that consists of a wheel with a rope or chain wrapped around it.

• Lever

• Pulley

• Inclined Plane

• Screw

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DOK Level 1: Recall

Explain how a lever can be used to lift a heavy object with less effort.

• By increasing the distance from the fulcrum to the point where effort is applied

• By decreasing the distance from the fulcrum to the point where effort is applied

• By increasing the weight of the object

• By using a shorter lever arm

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DOK Level 2: Skill/Concept

Which simple machine would be most effective for splitting wood?

• Lever

• Wedge

• Pulley

• Wheel and Axle

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DOK Level 1: Recall

Calculate the mechanical advantage of an inclined plane that is 10 meters long and 2 meters high.

• 2

• 5

• 10

• 20

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DOK Level 2: Skill/Concept

Describe how a wheel and axle can be used to reduce the effort needed to move an object.

• By increasing the friction between the wheel and the ground

• By allowing the wheel to rotate freely around the axle

• By decreasing the size of the wheel

• By increasing the weight of the axle

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DOK Level 2: Skill/Concept

A screw is an example of which type of simple machine?

• Inclined Plane

• Lever

• Pulley

• Wedge

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DOK Level 1: Recall

If a pulley system has a mechanical advantage of 4, how much effort force is needed to lift a 200 N weight?

• 50 N

• 100 N

• 200 N

• 800 N

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DOK Level 2: Skill/Concept

Analyze the benefits of using a compound machine over a simple machine.

• Compound machines are easier to build

• Compound machines can perform more complex tasks

• Compound machines require more effort

• Compound machines are less efficient

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DOK Level 3: Strategic Thinking