POE Unit 1.1 Practice Quiz
Name: ______
1. When comparing a sprocket and pulley system, list all the advantages and disadvantages that one system has over another.
2. Why can no machine ever have an efficiency greater than 100% or even a 100%?
3. Can you write out the equation for Work and Moment? What is the difference between the two?
4. A construction crew lifts approximately 800 lb of material several times during a day from a flatbed truck to a 42 ft rooftop. A block and tackle system with 95 lb of effort force is designed to lift the materials. What is the required actual mechanical advantage (SHOW WORK).?
5. What is the formula for calculating ideal mechanical advantage? What is the formula of calculating IMA of an inclined plane?
6. What is the efficiency of a machine that requires 150 J of input energy to do 90 J of work?
7. What is the formula for calculating actual mechanical advantage? What is the formula of calculating AMA of an inclined plane?
8. A girl pushes a box that has a mass of 500 N up an incline. If she pushes with a force of 200 N along the incline, what is the actual mechanical advantage of the incline?
9. Given the picture below, use the following information to draw your set up and calculate IMA, AMA, and Efficiency of this simple machine. SHOW WORK!!
Effort Length = 6.8 cm Resistance Length = 4.1 cm IMA =
Effort Force = 19 N Resistance Force = 43.6 N AMA =
Efficiency =
10. A simple gear train is composed of three gears. Gear A is the driver and has18 teeth, gear B has 28 teeth, and gear C has 26 teeth (SHOW WORK).
a. If the output is at C, what is the gear ratio?
b. If gear A rotates at 60 rpm, how fast is gear C rotating?
11. A 7/8 nut driver with a 1.5 inch diameter handle is used to install a ¼ 20 UNC bolt into a robotic arm.
a. Determine the circumference where the effort is applied.
b. Determine the pitch of the screw.
c. What is the mechanical advantage gained in the system?