Please, dont compromise if you can’t do it.
Lab Report Name: ____________________
Section: ___________________
EXPERIMENT: Centripetal Acceleration
DATA TABLE 1: (varying radius)
Constant hanging mass: _______ (kg)
Constant rotating mass (stopper): ___________ (kg)

Radius (m) Variable 
Time( s) 10 revs. 
Time (s) 1 rev. 
Circumference 2 π r^{ }(m) 
Velocity (m/s) 
(velocity)^2 (m^{2}/s^{2}} 
Trial 1 






Trial 2 






Trial 3 






Trial 4 







Theoretical Fc (N) 
Experimental Fc (N) 
Trial 1 


Trial 2 


Trial 3 


Trial 4 


DATA TABLE 2: (varying hanging mass)
Constant rotating mass (stopper): ___________ (kg)

Radius (m) Constant 
Hanging Mass (kg) 
Time (s) 10 revs 
Time (s) 1 rev 
Circumference 2 π r^{ }(m) 
Velocity (m/s) 
(velocity)^2 (m^{2}/s^{2}} 
Trial 1 







Trial 2 







Trial 3 







Trial 4 








Theoretical Fc(N) 
Experimental Fc(N) 
Trial 1 


Trial 2 


Trial 3 


Trial 4 


DATA TABLE 3: (varying rotating mass)
Constant hanging mass: _______kg

Radius (m) Constant 
Rotating Mass (kg) 
Time –sec 10 revs. 
Time– 1 rev 
Circumference 2 π r^{ }(m) 
Velocity (m/s) 
Trial 1 






Trial 2 






Trial 3 






Trial 4 







Theoretical Fc(N) 
Experimental Fc(N) 
Trial 1 


Trial 2 


Trial 3 


Trial 4 


Plot the following graphs:
From Data Table 1:
Radius vs. velocity
Radius vs. velocitysquared
From Data Table 2:
Centripetal force vs. velocity
Centripetal force vs. velocitysquared
From Data Table 3:
Rotating mass vs. velocity
Rotating mass vs. 1/velocitysquared
Questions:
A. What is the relationship between the radius and the velocity of the rotating object?
B. What is the relationship between the velocity of the rotating object and the centripetal force exerted on it?
C. The moon orbits the Earth at a distance of about 3.84 x 108 meters in a path that takes 27.3 days to complete. What is the centripetal acceleration of the moon?
D. What is the relationship between the mass of a rotating object and its velocity?
E. How would the shapes of the first two graphs change if the squares of the velocity were used?
F. When you swing a bucket of water up and down in a vertical circle you can keep the water in the bucket if you keep the velocity high enough. If you let the bucket slow down you get wet. The critical velocity is the slowest velocity necessary to keep the water in the bucket and not on you. What is the critical velocity for you if the formula is velocity = √(rg) where the radius of your arm swing including the bucket is r and g is the acceleration of gravity? Hint: You must measure or estimate the length from your shoulder to the center of the bucket for the radius.