PHY 101L Module Four Lab Report Centripetal Force

PHY101L Module Four Lab Report Centripetal Force Name: Thomas Hubert Date: 09/14/2023 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) 26.2 51.7 76.9 102.2 126.9 Mass of Bag with Washers (kg) 0.0262 0.0517 0.0769 0.1022 0.1269 Mass of Bobber (g) 8.9 Mass of Bobber (kg) 0.0089 Radius (cm) 30 Radius (m) 0.03 Circumference (m) 0.188 Time of 30 Revolutions (s) 17.43 16.91 15.37 15.14 13.46 Time of 1 Period (t) 0.581 0.564 0.512 0.505 0.449 Velocity (m/s) 0.324 0.333 0.367 0.372 0.419 Centripetal Force (m v² / r) 0.0311 0.0329 0.0399 0.0411 0.0521 Weight of Washers 0.257 0.507 0.754 1.002 1.244 Percent Difference 87.899 93.511 94.708 95.898 95.812 Activities 1–3: Questions 1. In Activity 1, which way did the blue marble travel when the cup was removed? The marble continues in a straight line in the direction of the black mark on the cup. 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. The velocity of the 14-washer bobber is greater than the velocity of the 8-washer bobber. The relationship between the mass of the cylinder with the washers and the velocity of the bobber is directly proportional. This means that as the mass of the cylinder with the washers increases, the velocity of the bobber also increases. The reason for this relationship is that the centripetal force, which is the force that keeps the bobber moving in a circular path, is proportional to the mass of the cylinder with the washers. The greater the mass of the cylinder with the washers, the greater the centripetal force and the greater the velocity of the bobber needs to be in order to maintain a circular path. 3. What do you notice about the relationship between the centripetal force and the weight of the cylinder with washers? Explain the reason for this relationship. The centripetal force is directly proportional to the weight of the cylinder with washers. This means that as the weight of the cylinder with washers increases, the centripetal force also increases. The reason for this relationship is that the weight of the cylinder with the washers is a measure of the mass of the cylinder with the washers. As the mass of the cylinder with the washers increases, the centripetal force also increases in order to keep the bobber moving in a circular path. 4. How will centripetal force be affected if you double the velocity at which you spin the bobber? If I double the velocity at which I spin the bobber, the centripetal force will also double. This is because the centripetal force is proportional to the square of the velocity. 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? If the mass of the washers in the cylinder remained the same and the radius was doubled, the velocity of the bobber would decrease by half. This is because the centripetal force is inversely proportional to the radius. (The physics classroom, 2020) The reason for this relationship is because the greater the radius, the longer the circumference of the circle. The longer the circumference, the more time it takes the bobber to complete one revolution, and the lower the velocity. References: