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Physics Ch. 7
| Question | Answer |
|---|---|
| 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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