Straighterline Introduction to Physics (lab) PHY250L Lab 5 Circular Motion & Gravity
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Lab Report Format Expectations
Utilize college level grammar and formatting when answering text based questions.
Report all equations in a proper mathematical format, with the correct signs and symbols.
Submissions with incomplete or improperly formatted responses may be rejected.
Pre-Lab Questions
1. State the inverse square law in your own words.
The inverse square law is used to describe the distance between two objects based on
the force of gravity between them and the objects fixed positions
2. State the equation used to find the average velocity of an object traveling in uniform circular
motion.
v = 2πr/T
3. Consider an object in orbit around the earth, such as a man made spacecraft or the moon.
Are these objects accelerating?
These objects were accelerating. This is due to the fact that the moon will accelerate more
as it gets farther from Earth. If the moon approaches Earth, its acceleration will be
influenced by gravity.
, Lab 5 Circular Motion & Gravity PHY250L
EXPERIMENT 1: BALANCING CENTRIPETAL
FORCE Introduction Questions
1. Suppose an object rotates 15 times every 2 seconds. State the equation for the period of an
object in circular motion in variable form, then calculate the period of rotation, ensuring
you include the correct units. You must show your work for credit.
1: T=1/f 2: T=15rotations/2sec 3: T=7.5rotations per second
2. In this lab, you will be rotating a mass on one side of a string that is balanced by a second mass
on the other end of the string (Figure 5). If you apply Newton's Second Law of Motion to mass 1,
m1, and mass 2, m2, you can solve for the period of mass 1, which is
2
=√π
Below, derive this equation by using Newton’s Second Law. You must show all pertinent algebra
and mathematical steps for credit. Hint: assume m 1= 4m2. How is the centripetal force on m1
related to the force of gravity on m2?
F=ma, ac=rv ^2, Fc=m1/rv^2, Fg=m2g, M1=4m2, Fc=Fg, 4m2/v^2*r=m2g, 4/v^2*r=g,
P=3.14^2r/g
Figure 5: Rotating mass.
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