Steve Boddeker's Uniform Circular Motion Pre-Lab

PHY131/121 Pre-Lab: Uniform Circular Motion Name:

2 2 2 F = m a FW = m g a = v /r a = 4 π r / T

1. (30%) The speed of the vertical shaft is maintained so 2. (20%) As you adjust the “spring force that the body is above the 20 cm radius mark. Your stop adjustment screw” and increase the watch records a value of 89.89 seconds for a total of 200 tension in the spring the velocity ______revolutions. What is the acceleration? a. increases. b. decreases. c. remains the same.

3. (30%) Plot the Hint: Remember, rearrange your equation (F = m a) to below set of relate to data using the y = m x + b given graph F = m a + F paper. Net T W Force accel slope: (N) (m/s2)

8.06 24.8 y-int: 11.33 34.1 13.57 39.9 x-int:

20 25 30 35 40 a (m/s2) (Hint: When graphing, unknowns in all physics labs are obtained from slopes and intercepts.) (20%) What is the mass of the circling body?