# Answer to Mechanical Advantage Worksheet - PowerPoint - PowerPoint by mhf39s

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

4
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
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
Solve: r wheel = ½ (15’) = 7.5 ft
r axle = ½ (3’) = 1.5 ft and
MA = 7.5’/1.5 ft = 5
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
Equation: MA = Load (R) / Effort(E)
Load = (5)(25 lb) = 125 lb
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

Given: H = 2 ft ; L = 30 ft
Find: MA
Equation: MA = L/H
Solve: MA = 30 ft/ 2ft = 15
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
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
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
Equation: MA = L/H; MA = R/E
Solve: MA = 8 in/2 in = 4
4 = R/60 lb
R =(4)(60 lb) = 240 lb
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
Given: d screwdriver = 1 in; d screw = ¾ in;   # of
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