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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 |