Effort

Topics: Force, Simple machine, Archimedes Pages: 5 (385 words) Published: January 22, 2014
Name:
Date:
Graded Assignment
Lab Report: Levers and Pulleys
Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. Note: You will not submit the Lab Report until you have completed the both labs, Levers and Pulleys. (3 points)

Score

1. Write the goal of the labs on levers and pulleys or the question you tried to answer. Answer: Levers: To find out how levers change the effort (force) needed to do work. Pulleys: To find out which type of pulley allows for the least amount of effort.

(3 points)
Score

2. Which observations, experiences, or lesson materials helped you form a hypothesis? Answer: I have never done anything similar to this so the class connect video helped me a lot!

(3 points)
Score

3. State your hypothesis.
Answer: If we change the length of the effort, then the effort will be greater. If we test three difference pulleys lifting 500 grams, then the single moving pulley will require the least effort.

(6 points)
Score

4. Use the data from the lab on levers to complete this data table. Answer:
Resistance
Effort
Force, as added mass to resistance side (g) converted to (N) Arm length
(m)
Work
(N × m or J)
A
Force (N) applied to balance the lever with no mass on effort side B
Pulling force applied to the spring scale (n) when mass is added to effort side Total force
B-A
Arm length
(m)
Work
(N × m or J)
300 g =
2.94 N
0.70
2.1
0.87
5.01
4.14
0.50
2.1
300 g =
2.94 N
0.75
2.2
1.53
7.45
5.92
0.45
2.6
300 g =
2.94 N
0.80
2.35
2.18
8.28
6.1
0.40
2.44
300 g =
2.94 N
0.85
2.5
3.30
11.10
7.8
0.35
2.73
(6 points)
Score

5. Use the data from the lab on pulleys to complete this data table. Answer:
Pulley System
Distance String
Pulled (cm)
Effort
Distance Mass
Lifted (cm)
Resistance

Force
(N)
Work
(N × cm)

Force
(N)
Work
(N × cm)
single fixed-position pulley
21
4.9
102.9
20
4.9
98
single moving pulley
41
2.44
100.2
20
4.9
98
one fixed-position pulley with one moving pulley
41
2.45
100.45
20
4.9
98

(3 points)
Score

6. Compare your data with your hypothesis. Explain how the data supports or does not support your hypothesis. If your data does not support your hypothesis, use the data you collected to answer the original question. Answer: My data agreed with all my hypothesis. I guessed that the effort would be greater and the effort ended up being greater. Pulleys: To find out which type of pulley allows for the least amount of effort.

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