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PHYS 1500 Chapter 2
| Question | Answer |
|---|---|
| Translational motion | Horizontal or vertical movement |
| Rotational motion | Circular movement |
| Rotational inertia | Body rotating tends to stay rotating |
| Angular position | Orientation of a rotating object relative to reference orientation |
| Radian | Unit for angles |
| Angular velocity | Angular position changes over time in a given direction |
| Angular speed | Angular position changes over time |
| Axis of rotation | The area in which an object is rotating in |
| The right hand rule | Rule designating rotation to the right, thumb points in position of the axis, fingers curl in the direction of rotation. |
| Newton's First Law of Rotational Motion | A rigid object that is not wobbling and not subject to outside torques rotates at constant angular velocity |
| Torque | Outside influence that causes rotation |
| Center of mass | The point of an object where mass is equally distributed |
| Angular acceleration | Degrees/sec^2, measures how quickly angular velocity changes |
| Newton-meter | measurement of torque, N*m |
| Radians/second^2 | Unit of angular acceleration |
| Net torque | All torques being exerted on a rotating object |
| Newton's second law of rotational motion | Net torque=rotational mass x angular acceleration |
| Newton's third law of rotational motion | For every torque exerted, there is an equal and opposite torque |
| Center of gravity | center of mass |
| Friction | Opposition of two forces that are in direct contact of each other due to surface contact |
| Relative motion | When two surfaces are traveling at different velocities |
| Momentum | Measure of object's translational motion = mass * velocity |
| Impulse | Force exerted on an object for a certain amount of time, used to transfer momentum |
| Angular momentum | Measure of object's rotational momentum = rotational mass * angular velocity |
| kg X m^2/s | S.I. unit for angular momentum |
| Angular impulse | Transfer of angular momentum |