PHY 101L Module Four Lab Report Centripetal Force (1)
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/PHY101L Module Four Lab Report Centripetal Force
Name: Amber Smith
/
Date: 9/22/2023
Complete this lab report by replacing the bracketed text with the relevant information.
Activities 2 and 3: Centripetal Force
Data Table 1
Trial
1
2
3
4
5
# of Washers
1
2
3
4
5
Mass of Bag with Washers (g)
29.2g
55.2g
81.6g
107.7g
134g
Mass of Bag with Washers (kg)
0.0292kg
0.0552kg
0.0816kg
0.1077kg
0.134kg
Mass of Bobber (g)
11.1g
Mass of Bobber (kg)
0.0111kg
Radius (cm)
30cm
Radius (m)
0.3m
Circumference (m)
1.88m
Time of 30 Revolutions (s)
32.12s
33.81s
34.94s
33.31s
37.38s
Time of 1 Period (t)
1.07s
1.12s
1.16s
1.11s
1.24s
Velocity (m/s)
1.76m/s
1.67m/s
1.62m/s
1.69m/s
1.51m/s
Centripetal Force
(m
v² / r)
0.11
0.10
0.09
0.10
0.8
Weight of Washers
286.16
540.96
799.68
1055.46
1313.2
Percent Difference
99.9%
91.5%
99.9%
99.9%
99.9%
Activities 1–3: Questions
1.
In Activity 1, which way did the blue marble travel when the cup was removed?
Once released the marble went in the direction of the mark on the cup and then at a left angle too. 2.
You spun a bobber with a mass of 14 washers in the cylinder, and one with a mass of 8 washers in the cylinder. How does the velocity of the 14-washer bobber compare with the velocity of the 8-
washer bobber? Describe the relationship between the mass of the cylinder with the washers and the velocity of the bobber. If I compare spinning 2 washers vs spinning 5 washers, the velocity of spinning two washers is higher
than 5 washers. The mass that was lower gave a faster velocity because mass and velocity are inversely proportional to one another. 3.
What do you notice about the relationship between the centripetal force and the weight of the cylinder with washers? Because force is equal to mass *v2/radius, the weight of the washers affects
the velocity, which in turns affects the force. 4.
How will centripetal force be affected if you double the velocity at which you spin the bobber? If you double the velocity, the force will go up as well. Because Force is equal to mass*v2/radius
5.
What would you expect to happen to the velocity of the bobber if the mass of the washers in the cylinder remained the same and the radius was doubled? The velocity can be found by the circumference/time for one period. If radius is doubled then the velocity should also be doubled.
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