Fulcrum at: 14.5 cm Trial Load (mass) Distance Load – Fulcrum ( ) Effort (mass)
ID: 2074951 • Letter: F
Question
Fulcrum at: 14.5 cm
Trial
Load
(mass)
Distance
Load – Fulcrum
( )
Effort
(mass)
Distance
Effort – Fulcrum
( )
Ratio
Effort Distance Load Distance
Expected Ratio
1
1 quarter
4.0cm
1 quarter
7.0cm
1.8
1
2
2 quarters
4.0cm
1 quarter
9.0cm
2.3
2
3
3 quarters
4.0cm
1 quarter
12.0cm
3.0
3
4
4 quarters
4.0cm
1 quarter
14.5cm
3.6
4
Sample Calculation of Expected Ratio for Trial 2:
M.A= Load/Effort(mass), 2 quarters/1 quarter= 2.
Data Table 2: First Class Lever
Fulcrum at: 0.50 cm Spring Scale mass:62g
Trial
Load
mass
(kg)
Load
weight
(N)
Load Distance
( )
Spring Scale
Weight
( )
Spring Scale Reading
( )
Effort Force
( )
Effort Distance
( )
M.A.
1
0.170kg
1.7N
10cm
0.61N
0.44N
0.97N
45cm
1.75
2
0.170kg
1.7N
15cm
0.61N
0.61N
1.3N
45cm
1.31
3
0.170kg
1.7N
10cm
0.61N
0.65N
1.5N
45cm
1.13
4
0.170kg
1.7N
5cm
0.61N
0.69N
1.9N
45cm
0.89
Sample Calculation for Mechanical Advantage:
-Load(weight in N)/Effort force(in N).
Data Table 3: Second Class Lever
Fulcrum at: 0.50 cm
Trial
Load
(N)
Load Distance
( )
Effort Force
( )
Effort Distance
( )
M.A.
1
1.5
0.45m
1.0
45cm
1.5
2
1.3
0.15m
1.1
47cm
1.18
3
2.0
0.40m
1.7
55cm
1.18
4
1.7
0.35m
1.3
43cm
1.31
Data Table 4: Third Class Lever
Fulcrum at: 0.50 cm
Trial
Load
(N)
Load Distance
( )
Effort Force
( )
Effort Distance
( )
M.A.
1
2.2
15cm
0.76n
0.50
2.9
2
1.0
20cm
0.33n
0.50
3.0
3
2.6
25cm
0.68n
0.50
3.8
4
1.4
30cm
0.45n
0.50
3.1
Trial
Load
(mass)
Distance
Load – Fulcrum
( )
Effort
(mass)
Distance
Effort – Fulcrum
( )
Ratio
Effort Distance Load Distance
Expected Ratio
1
1 quarter
4.0cm
1 quarter
7.0cm
1.8
1
2
2 quarters
4.0cm
1 quarter
9.0cm
2.3
2
3
3 quarters
4.0cm
1 quarter
12.0cm
3.0
3
4
4 quarters
4.0cm
1 quarter
14.5cm
3.6
4
te e dr thè Mechanical Advantage change as the load is moved progressively farther away from the fulcrum? As the load is further away from the fulcrum, the M.A. increases for the second class lever. As my trial 1 had the highest load distance and had the highest M.A.compared to trial 2 which had lower numbers in both categories. Examine the third-class lever data. You should have found that the Mechanical Advantage in this case is less than 1, while for the first-and second-class levers it was greater than one. What is 4) PHY 110 Online Hands On Labs this telling you about third-class levers. [Hint: review the sketches of the th the write-up of levers on 5) Why do we add the Weight of the Spring Scale to the Spring Scale Reading to calculate the Effort Force in Table 2, but not in Tables 3 and 4 6) Doors are built with the handle near the edge, as far away as possible from the hinges, which act as the fulcrum. Why so? What class of lever does a door represent? 7) Try placing your hand at the middle of the door and push to open it. Will you require more or less effort than when you open it using the handle? What class of lever does this case represent Focus 8s8 a 5 6 7 8 9Explanation / Answer
4) Since Third class lever has MA less than 1, this implies that it requires more effort than the load which is being applied.
5) In table 2, we are evaluating First Class lever. So in this type of Lever weight of spring balance itself acts as a effort force since weight of spring balance is pulling the lever. Thus weight of spring balance along with spring scale reading gives the combined result for effort applied.
6) Since Effort is away from the load it is Second Class type of lever. Doors have handle as far away from the hinge as possible(near the edge) to increase MA and thus have decreased Effort to open it.
7) When placing the hand in middle and pushing it, you will require more effort to push the door. Because it acts like Third Class of lever which has MA less than 1.
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