Answer to Mechanical Advantage Worksheet

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Answer to Mechanical Advantage Worksheet

• 1. What is the mechanical advantage of the system
  pictured?
• 4

2
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

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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

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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

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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

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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

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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

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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

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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 (p)(d screwdriver)
• pitch 1/ of threads per inch
• Solve pitch 1/10 0.1 in
• c (p)(1 in) (3.14)(1 in) 3.14 in
• MA 3.14 in / 0.1 in 31.4

3/4 - 10 UNC
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Answer to Mechanical Advantage Worksheet

• Application
• The students answers will vary. The purpose of
  the question is to assist them with their
  project.