Exploring Wheel and Axles in POE 1.1.1a

What is the mechanical advantage if it is greater than one?

• Energy creator

• Efficiency reducer

• Force multiplier

• Distance multiplier

What type of lever is a wheelbarrow considered?

• Third class

• Second class

• First class

• Not a lever

What example is given for a wheel and axle?

• Bicycle

• Fan

• Clock

• Screwdriver

How is the ideal mechanical advantage of a wheel and axle calculated?

• Force divided by distance

• Distance divided by force

• Diameter of axle divided by diameter of wheel

• Diameter of wheel divided by diameter of axle

What is the actual mechanical advantage if the wheel is driving with a force of exertion of 70 pounds and a resistance of 200 pounds?

• 3.3

• 1.5

• 2.86

• 0.3

What does the efficiency of a machine compare?

• Distance multiplier to force multiplier

• Actual mechanical advantage to ideal mechanical advantage

• Input work to output work

• Energy used to energy wasted

What does a fixed pulley change?

• The speed of the load

• The direction of the force

• The amount of force needed

• The weight of the load

How do you find the ideal mechanical advantage of a pulley system?

• Divide the weight by the number of pulleys

• Count the number of ropes supporting the load

• Multiply the weight by the distance

• Count the number of pulleys

What is the ideal mechanical advantage of a compound machine?

• Sum of the mechanical advantages of its parts

• Difference of the mechanical advantages of its parts

• Average of the mechanical advantages of its parts

• Product of the mechanical advantages of its parts

What is a common misconception about pulleys?

• They can create energy

• They always reduce the force needed

• Angles and directions of forces don't matter

• They can change the direction of the force