Answer to Mechanical Advantage Worksheet - PowerPoint - PowerPoint by mhf39s

VIEWS: 120 PAGES: 10

									 Answer to Mechanical Advantage
           Worksheet
• 1. What is the mechanical advantage
  of the system pictured?


                   4
 Answer to Mechanical Advantage
           Worksheet
2. If the load is 100 pounds, how much
  effort is required to pick up the load?

Given: Load (R) = 100 Pounds
Find: Effort (E)
Equation: MA = Load/Effort = R/E
Solve: 4 = 100 lb / E
        E = 100 lb / 4 = 25 lb
  Answer to Mechanical Advantage
            Worksheet
3. What is the mechanical advantage of the system pictured on
  the left if the diameter of the wheel is 15 feet and the diameter
  of the axle is 3 feet?
Given: d wheel = 15 ft; d axle = 3 ft
Find: MA
Equation: radius = ½ d
           MA = radius of wheel/radius of axle
Solve: r wheel = ½ (15’) = 7.5 ft
       r axle = ½ (3’) = 1.5 ft and
       MA = 7.5’/1.5 ft = 5
 Answer to Mechanical Advantage
           Worksheet
4. If Mrs. Jones can only pull with 25 lbs of
  force, how much weight can she lift using the
  wheel and axle system from question 3?

Given: MA =5; Effort = 25lb
Find: Load
Equation: MA = Load (R) / Effort(E)
Solve: 5 = Load/25 lb
       Load = (5)(25 lb) = 125 lb
 Answer to Mechanical Advantage
           Worksheet
5. If we build a ramp in Tech Ed class
  that is 2 feet high and the length of
  the ramp is 30 feet, what is the
  mechanical advantage?

Given: H = 2 ft ; L = 30 ft
Find: MA
Equation: MA = L/H
Solve: MA = 30 ft/ 2ft = 15
 Answer to Mechanical Advantage
           Worksheet
6. How much effort force would
  someone need to push a 45 pound
  box up the ramp from question 5?
Given: MA = 15; Load = 45 lb
Find: Effort
Equation: MA = R/E
Solve: 15 = 45 lb / E = 3 lb
 Answer to Mechanical Advantage
           Worksheet
7. Jose and Suzette construct an arm where
  the effort is located 10 inches from the
  fulcrum and the load is 25 inches from the
  fulcrum, what is the mechanical advantage
  of the arm?

Given: LE = 10 in; LR = 25 in
Find: MA
Equation: MA = LE/LR
Solve: MA = 10 in / 25 in = 0.4
 Answer to Mechanical Advantage
           Worksheet
8. Find the mechanical advantage and the
  maximum separation load for a wedge used to
  split the object shown. The wedge has an incline
  length of 8 inches, an overall height of 2 inches.
  The effort load applied is 60 pounds.
Given: L = 8 in ; H = 2 in; E = 60 lb
Find: MA; Max. Load
Equation: MA = L/H; MA = R/E
Solve: MA = 8 in/2 in = 4
       4 = R/60 lb
       R =(4)(60 lb) = 240 lb
 Answer to Mechanical Advantage
           Worksheet
9. Using a 1-inch diameter screwdriver, students in
   the lab used the screw shown to fasten two
   objects together. What is the mechanical
   advantage of the screw?
Given: d screwdriver = 1 in; d screw = ¾ in;   # of
   threads/1 in screw = 10
Find: MA
Equation: MA = Circumference (C) / Pitch
             C = (π)(d screwdriver)
            pitch = 1/# of threads per inch
Solve: pitch = 1/10 = 0.1 in
        c = (π)(1 in) = (3.14)(1 in) = 3.14 in
                                                  3/4 - 10 UNC
         MA = 3.14 in / 0.1 in = 31.4
 Answer to Mechanical Advantage
           Worksheet
• Application:
  – The students’ answers will vary. The purpose
    of the question is to assist them with their
    project.

								
To top