Physics Ch. 7
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| Define rotational motion. Give an example. | Motion of a body that spins about an axis.
Ex- Ferris wheel.
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| Angles must be measured in ________ in rotational motion. Why? | Radians.
-Because it allows us to compare linear and rotational motion.
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| Define a radian. | An angle whose arc length is equal to its radius.
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| Is angular displacement a vector or scalar quantity? | Vector, because displacement is a vector quantitiy.
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| Is counterclockwise positive or negative for angular displacement? | Positive.
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| Is clockwise positive or negative for angular displacement? | Negative.
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| Angular speed describes... | Rate of rotation.
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| Angular speed should be in.... | Radians/Second.
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| Define angular acceleration. | The time rate of change of angular speed, expressed in radians per second squared.
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| 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.
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| Define tangential speed. | The instantaneous linear speed of an object directed along the tangent of the object's circular path.
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| Objects that have circular motion have _____________. | Tangential speed.
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| Define tangential acceleration. | The instantaneous linear acceleration of an object directed along the tangent to the object's circular path.
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| Angular speed has constant ________, but not constant _________. | Magnintude; Direction.
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| How can we produce an acceleration from velocity? | 1.) Change in magnitude.
2.) Change in direction.
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| Centripetal vs. angular acceleration. | Centripetal: Includes linear.
Angular: One direction.
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| Define centripetal acceleration. | Acceleration directed toward the center of a circular path.
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| Tangential and centripetal acceleration are __________ to one another. | Perpendicular.
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| How can we find the magnitude and direction of the total acceleration? | Use the Pythagorean Theorem.
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| Centripetal acceleration go towards the... | Center of the path.
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| If there is an acceleration, there must also be _________, which we call _________. | Force; Centripetal Force.
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| Inertia tends to... | Maintain the balls motion in a straight-line path.
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| Define gravitational force. | The mutual force of attraction between particles of matter.
Ex- Moon and Earth.
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| What is Newton's Law of Universal Gravitation? | Things with mass will be attracted to each other.
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Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
OliviaRoark
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