Simple Machines

Which of the following is a simple machine?

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What is the benefit of a simple machine?

• It allows us to convert motion into electricity.

• It prevents us from making careless mistakes.

• It uses magnets to move objects.

• It allows us to move objects more easily.

What is an axle?

• The tire that fits around a wheel.

• The rod around which wheels rotate.

• A type of inclined plane.

• The rope that is strung through a pulley.

What is a fulcrum?

• A metal rod that connects two wheels

• A fixed point around which a wheel and axle rotate

• A very large type of wheel and axle

• A device that combines a wheel and axle with an inclined plane

Which of the following statements is true?

• The wheel and axle multiply the force you apply to them

• The wheel and axle lessen the force you apply to them

• The wheel and axle make sure the level of force you apply is consistent

• The wheel and axle require a tremendous amount of force to operate

Which of these devices uses a wheel and axle?

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Why don't we just remove the wheel and turn the axle?

• Turning the axle directly requires too much effort

• Without the wheel, the axle is useless

• The wheel balances out the weight of the axle

• The wheel balances out the weight of the axle

Which answer correctly describes wheel and axle movement?

• The wheel and axle move the same distance and turn with the same amount of force

• The wheel moves a lesser distance than the axle but turns with greater force

• The wheel moves a greater distance than the axle but turns with less force

• The wheel moves, while the axle stays completely stil

A wheel and axle is basically just a rotating version of what?

• lever

• pulley

• inclined plane

• electromagnet

In a doorknob, what part functions as the wheel?

• The knob itself

• The metal rod in the middle

• The fulcrum

• The keyhole