Rotational motion and
The Law of Gravity
Garifullin Tagir B22-544
Why we need to know about
rotational motion?
Rotational movement examples
Rotational motion and Newton's law of universal gravitation can explain
some interesting facts such as: space travel and satellites position.
Angular velocity and
angular acceleration
● The radian is a unit of angle measurement,
analog of degrees.
Relations between angular
and linear quantities
Angular quantities closely related to linear quantities
• Tangential speed:
• Each point on a rotating object has the same angular speed
• Tangential acceleration:
Centripetal and tangential
acceleration
We can find the quantity of the total acceleration using
Pythagoras' theorem
• In circular motion with constant speed, the total
acceleration vector is always directed to the center of the
circle because there is no tangential acceleration
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Fictitious forces
(In non-inertial reference frames)
Coriolis force
If a person on the carousel throws a stone, it will seem
that the stone fly sideways because of Coriolis force
Newtonian gravity
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Before 1686, no one knew how the Moon and Earth interacted.
Isaac Newton discovered the that all objects are attract each other
It was proven experimentally in 1798
QUESTIONS
• Why does physics study the rotational motion?
• What analogies of linear motion exist in rotational motion?
• What is the unit of angular measure?
• What happened before? An experiment with universal
gravity or a theoretical conclusion?
Key terms
• Rotation, circular, movement, motion, angular
• Angular displacement, angular speed, angular acceleration
• Accelerations: Centripetal and tangential
• Fictitious forces: centrifugal force, Coriolis force
• Newtonian gravity, law of universal gravitation