# 4 1 circular motion prelab

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Pre-Lab Questions
1. 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). Apply Newton's Second Law of Motion to mass 1, m
1
, and mass
2, m
2
, to solve for the period of mass 1.
Hint: assume m
1
= 4m
2
. How is the centripetal force on m
1
related
to the force of gravity on m
2
?
g =

g =
= 4rg
V =

T =

T =


T =


T =


The centripetal force on
is related to the force of gravity on
because gravity is
causing the vertical acceleration and as the rotation of the mass increases, so does
the period of rotation.

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Pre-Lab Questions 1. 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). Apply Newton's Second Law of Motion to mass 1, m1, and mass 2, m2, to solve for the period of mass 1. Hint: assume m1= 4m2. How is the centripetal force on m1 related to the force of gravity on m2? 𝑚1 g = 𝑚2 𝑉 2 4𝑚2 g = 𝑟 𝑚2 𝑉 2 Figure 5: Rotating mass. 𝑟 𝑉 2 = 4rg V = √4𝑟𝑔 T= T= T= T= 2𝜋𝑟 𝑉 2𝜋𝑟 √4𝑟𝑔 2𝜋√𝑟 √4𝑔 2𝜋 √𝑟 √39.2 The centripetal force on ...
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