# Rotational Motion & Gravity

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1. rotational motion
motion of a body that spins about an axis
2. tangential speed
an instantaneous linear speed of an object directed along the tangent to the object's circular paths
3. tangential acceleration
• the instantaneous linear acceleration of an object directed along the tangent to the object's circular path
• due to changing speed
4. centripetal acceleration
• acceleration directed toward the center of a circular path; radially inward
• object in circular path whose acceleration changes only because of direction has this
5. gravitational force
• the mutual force of attraction between particles of matter
• always exists between two masses, regardless of medium between them or size
6. period
• time for an object to complete one uniform motion (back and forth, around a circular path)
• t=circumference/v
7. frequency
• the number of times something happens per given unit of time
• f=1/t
8. force that maintains circular motion
• inertia would cause object to follow a straight line
• string or medium counteracts this by exerting a force on the object, directed along its length towards the center of the circle
9. force that pushes things outward in centripetal acceleration, overcoming this
• centrifugal force
• friction between the thing stopping the object from going outside its path maintains the circular motion
10. strength of gravitational force
• decreases as the masses move further apart
• proportional to the mass of an object
11. Newton's shell theorem
• a uniform spherical shell of matter attracts a particle that is outside the shell as if the shell's mass were concentrated at its centerĀ
• attractive force is directed along the line of centers for the two objects
 Author: Gymnastxoxo17 ID: 275296 Card Set: Rotational Motion & Gravity Updated: 2014-05-25 15:54:02 Tags: Chapter Seven Folders: H Physics Description: d Show Answers: