4 Simple Machines, and Efficiency

Simple machines change the size and __________ of forces.

• color

• direction

• work

• property

Which person in the picture does MORE WORK moving a 100 N ice block to a height of 1 meter above the ground.

Lifting it up directly or moving it up the inclined plan?

• Lifting it up directly the 1 meter height

• Moving it up the 5 meter length ramp

• Both would require the SAME AMOUNT of work

• Neither requires work (W=Fd) to be done

Wheels, levers, pulleys, ramps, screws, and wedges are forms of _______________________.

• potential energy

• simple machines

• chemical changes

• dark matter

The 'ratio' of Output force to Input force is called:

• Mechanical advantage

• Efficiency

• Pressure

• Work

What is the Mechanical Advantage for a machine that requires 10 N of input force to lift an object with a weight of 40 N?

• 400

• 4

• 40

• 0.25

Select two complex (compound) machines?

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How many type of simple machines are there?

• 1

• 2

• 4

• 6

A bicycle is which of the following?

• A complex machine

• A very efficient machine

• A combination of several simple machines

• All answers

Which of the following is an inclined plane?

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Which of the following is a wedge?

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