# Chapter 6:Circular motion and Gravitation - PowerPoint PPT Presentation

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## Chapter 6:Circular motion and Gravitation

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### Chapter 6:Circular motion and Gravitation Work out the radial acceleration of the moon around the earth. Ferris wheel Conical Pendulum Center-seeking Force: Tension ... – PowerPoint PPT presentation

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Title: Chapter 6:Circular motion and Gravitation

1
Chapter 6Circular motion and Gravitation

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Work out the radial acceleration of the moon
around the earth.
4
Ferris wheel
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Conical Pendulum
• Center-seeking Force Tension

Circular Motion
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Conical Pendulum
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No Skidding on a Curve (I)
Center-seeking Force Static Friction
• msmin ?

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No Skidding on a Curve (II)
r 50.0 m
C
• m 1000 kg

v 14.0 m/s
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No Skidding on Banked Curve

12
6-54.When the system rotates about the rod the
strings are extended as shown.
The tension in the upper string is 80 N
13
6-55 . As the bus rounds a flat curve at constant
speed, a package suspended from the luggage rack
on a string makes an angle with the vertical as
shown.
14
Gravitation
Newtons Law of Gravitation
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Gravitational attraction
Note Two particles of different mass exert
equally strong gravitational force on each other
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Gravitational Forces (I)
MM
MM ME FG G
r 2
• Attractive Force

ME
17
Why is the Aggie not falling off the earth?
Remember there is equally strong attraction
between the earth and the Aggie and vice versa
18
Cavendish balance
Cavendish(1798) announced that he has weighted
the earth
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Average Density of the Earth
• g 9.80 m/s2
• RE 6.37 x 106 m
• ME 5.96 x 1024 kg
• rE 5.50 x 103 kg/m3
• 5.50 g/cm3 2 x rRock

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Projectile
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Circular orbit
The larger r then slower the speed and the larger
the period
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Black hole
Steven Hawkins is associated with the department
of Physics and Astronomy at TAMU
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(will be derived later)
r
How can the sun become a Black Hole?
This would increase the suns mass. There is a