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| what are the 2 parts of mechanics? |
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| mechanics not related to mass |
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| mechanics RELATED to mass |
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| what are the 2 parts of kinetics? |
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| what is the difference between statics and dynamics regarding acceleration? |
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| statics does NOT involve acceleration because velocity is constant; dynamics DOES include acceleration |
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| what is the difference between statics and dynamics regarding equilibrium systems? |
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| statics deals with equilibrium systems, dynamics deals with non-equilibrium systems |
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| mechanical descriptions of a linear motion independent of mass |
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| what are some examples of linear kinematics? |
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| location, displacement, velocity, speed, acceleration |
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| translation: a movement of an object in which all the points of the object move through the same distance in the same direction during a given time period |
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| Give an example of linear motion |
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| pushing a wheelchair straight forward. Moving the eraser straight along the edge of the board |
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| is curvilinear motion still linear motion? |
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| a quantity that is represented by magnitude only |
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| a quantity that is represented by both magnitude and direction |
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| is speed scalar or vector? |
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| is weight scalar or vector? |
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| is distance scalar or vector |
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| what is the Cartresian reference frame? |
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| a graph with x, y (z) axes |
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| what is another term for the Cartesian reference frame? |
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| orthogonal reference frame |
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| in the cartesian reference fram, what do x, y, z indicate? |
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| in the Cartesian reference frame, what do I, j, and k indicate? |
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| how do you write in an equation the position of point (x, y, z)? |
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| what is the magnitude of the vector of point (x, y, z)? |
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| can you just add and subtract vectors? |
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| yes: you can add 2 velocities together, you can add 2 forces together, and so on |
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| If you are given the velocity of the hand, elbow, and shoulder in a ball pitch, how to determine the velocity of the balll? |
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| add the velocity of the hand, elbow shoulder = velocity of the ball |
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| using vectors, how do we describe position of a point |
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| using scalar, how do we describe the position of a point? |
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| a scalar that describes the difference between positions (change in position) along the path traveled |
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| a vector that describes the difference between positions or change in position including direction |
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| which is more like going along a road: travel distance or displacement? |
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| If position 1 = P1 = x1i +y1j and position 2 = P2 = x2i + y2j, then what is the displacement from P1 to P2? |
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| P2 - P1 = x2i + y2j - x1i - y1j |
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| what is the displacement of a 400m run on a track? |
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| what is the travel distance of a 400m run on a track? |
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| the scalar quantity that describes the rate of travel with respect to time |
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| the vector quantity that describes the rate of displacement with respect to time |
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| is speed or velocity equal to travel distance/duration? |
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| speed = travel distance/duration |
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| what is the magnitude of velocity? |
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| the square root of the sum of squares of velocities in all different directions |
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| is speed or velocity equal to displacement/duration? |
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| V = displacement/duiration |
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| define instantatneous speed |
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| speed at a specific time point = average speed over a very short time period |
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| define instantaneous velocity |
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| velocity at a specific time point = average velocity over a very short time period |
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| when will average and instantaneous velocity have the same magnitude? |
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| when velocity is constant |
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| what two types of speed and velocity have the same magnitude? |
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| the scalar or vector that describes the rate of the change in speed or velocity |
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| what is the formula for average acceleration |
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| change in speed or velocity divided by duration |
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| define instantaneous acceleration |
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| acceleration at a specific time point = average acceleration during a short duration |
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| what is the area under the curve in a velocity vs time graph |
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| what is the slope of the line in a velocity vs time graph |
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Definition
| acceleration at a specific time point = average acceleration during a short duration |
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| how do you calculate the non-constant speed or velocity over time? |
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| sum up many small rhomboids |
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| do instantaneous speed and velocity have the same magnitude? |
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