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Physics Ch. 7

QuestionAnswer
Define rotational motion. Give an example. Motion of a body that spins about an axis. Ex- Ferris wheel.
Angles must be measured in ________ in rotational motion. Why? Radians. -Because it allows us to compare linear and rotational motion.
Define a radian. An angle whose arc length is equal to its radius.
Is angular displacement a vector or scalar quantity? Vector, because displacement is a vector quantitiy.
Is counterclockwise positive or negative for angular displacement? Positive.
Is clockwise positive or negative for angular displacement? Negative.
Angular speed describes... Rate of rotation.
Angular speed should be in.... Radians/Second.
Define angular acceleration. The time rate of change of angular speed, expressed in radians per second squared.
Rotational motion vs. circular motion. Rotational: A single point on a rotating object undergoes circular motion. Circular: Just a point of mass moving about a central axis.
Define tangential speed. The instantaneous linear speed of an object directed along the tangent of the object's circular path.
Objects that have circular motion have _____________. Tangential speed.
Define tangential acceleration. The instantaneous linear acceleration of an object directed along the tangent to the object's circular path.
Angular speed has constant ________, but not constant _________. Magnintude; Direction.
How can we produce an acceleration from velocity? 1.) Change in magnitude. 2.) Change in direction.
Centripetal vs. angular acceleration. Centripetal: Includes linear. Angular: One direction.
Define centripetal acceleration. Acceleration directed toward the center of a circular path.
Tangential and centripetal acceleration are __________ to one another. Perpendicular.
How can we find the magnitude and direction of the total acceleration? Use the Pythagorean Theorem.
Centripetal acceleration go towards the... Center of the path.
If there is an acceleration, there must also be _________, which we call _________. Force; Centripetal Force.
Inertia tends to... Maintain the balls motion in a straight-line path.
Define gravitational force. The mutual force of attraction between particles of matter. Ex- Moon and Earth.
What is Newton's Law of Universal Gravitation? Things with mass will be attracted to each other.
Created by: OliviaRoark
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