Term
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Definition
| the study of motion and physical concepts such as force and mass |
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Term
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Definition
| this is the part of dynamics that describes motion without regard to its cause |
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| what is the geocentric model |
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Definition
| this theory regarded Earth as the center of the universe |
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Term
| what is the heliocentric model |
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Definition
| this theory states that Earth and other planets revolve in circular orbits around the sun |
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Term
| what is a frame of reference |
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Definition
| this is a choice of coordinate axes that defines the starting point for measuring any quanity, an essential first step in solving any problem in mechanics |
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Term
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Definition
| this is defined as its change in position and given by: delta x |
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Term
| what is a vector and give three examples of vector quantities |
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Definition
| a vector quantity is characterized by having both direction and magnitude. three examples of vector quantities are displacement, velocity, & acceleration |
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| what is average speed and how do you find it |
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Definition
| is the length of the path it travels divided by the total elapsed time |
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Term
| what is average velocity and how do you find it |
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Definition
| it is a vector quantity, having both magnitude and a direction. to find average velocity, take the change in displacement and divide it by the change in time |
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Term
| what ia a position vs. time graph |
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Definition
| this a graphical interpretation of velocity |
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Term
| how can you determine the average velocity of a position vs. time graph when the slope is not linear |
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Definition
| the average velocity of an object during the interval delta t, is equal to the slope of the straight line joining the inital and final points on a graph of the objects position vs. time. |
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Term
| what is instantaneous velocity |
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Definition
| this is the speed of your car and the direction it was going at a particular instant in time |
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Term
| how can you find the instantaneous velocity at any time |
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Definition
| take the slope of the line tangent to the position vs. time curve |
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Term
| how is instantaneous velocity different than instantaneous speed |
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Definition
instantaneous speed doesnt carry an algebraic sign, for example: +/- 15 m/s is an instantaneous velocity, whereas, 15 m/s is an instantaneous speed
in other words, instantaneous speed is scalar |
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Term
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Definition
| this is the change of an object's velocity with regards to time |
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| when an objects velocity and acceleration are in the same direction, what happens to speed |
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Definition
| speed increases over time |
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Term
| when an objects velocity and direction move in opposite directions, what happens to speed |
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Definition
| speed decreases over time |
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Term
| what is instantaneous acceleration |
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Definition
| this is the limit of the average acceleration as the time interval goes to zero |
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Term
| what can you find from a velocity vs. time graph |
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Definition
| one can find the average acceleration by taking the delta v divided by the delta t |
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Term
| how can you find the instantaneous acceleration on a velocity vs. time graph |
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Definition
| take the slope of the tangent to the velocity vs. time graph at that time |
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Term
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Definition
| a representation of a moving object at successive time intervals, with velocity and acceleration vectors sketched at each position |
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Term
| when an object moves with constant acceleration, the instantaneous acceleration at any point in a time interval is |
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Definition
| equal to the value of the average acceleration over the entire time interval |
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Term
| what does the area under a velocity vs. time graph always equal |
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Definition
| it always equals the displacement of the object |
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Term
| what is a free falling object |
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Definition
| any object moving freely under the influence of gravity alone, regardless of its initial motion |
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| how do we denote the magnitude of free falling acceleration |
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Definition
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