POE Unit 1 Review

What is the ideal mechanical advantage for this block and tackle pulley system?

• 1

• 2

• 3

• 4

What is the actual mechanical advantage if the resistance force is 50 lbs and

the effort force is 15 lbs?

• 0.3

• 3.33

• 35

• 3.33 lbs

The ramp is 4 feet tall (vertical distance) and the base (horizontal distance) is 6 feet long. What is the mechanical advantage of this ramp?

• 1.5 ft

• 0.67

• 1.5

• 24

The ramp is 4 feet tall (vertical distance) and the base (horizontal distance) is 6 feet long. What is the effort needed to push the 125 pound weight up the ramp?

• 69.4

• 500

• 83.33

• 0.012

The load is 3 feet from the pivot point, the effort is applied 12 feet from the pivot point and the load weights 30 pounds. What is the mechanical advantage?

• 4

• 3

• 12

• 34

The load is 3 feet from the pivot point, the effort is applied 12 feet from the pivot point and the load weights 30 pounds. What is the effort required to lift that 50 pound load?

• 150 lbs

• 12.5 lbs

• 36

• 24

Which one describes a first class lever? (including the MA)

• Fulcrum between effort and resistance; M.A. is equal to, less than 1, or greater than 1.

• Resistance between effort and fulcrum; M.A. is greater than 1

• Effort is between resistance and fulcrum; M.A. is less than 1

Which class lever do you want if you ALWAYS want to do less work?

• 1st class lever

• 2nd class lever

• 3rd class lever

(Gear A {input} has 10 teeth, B has 6 teeth, and C {output} has 12 teeth). What is the overall gear ratio?

• 0.6

• 0.83

• 6

• 1.2

(Gear A {input} has 10 teeth, B has 6 teeth, and C {output} has 12 teeth). If you turn gear A at 40 rpm, what speed is gear C turning?

• 400

• 33.33

• 33.33 rpm

• 480 rpm