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Lecture 3

PSC 1121 Lecture 3: Physical Science Speed and Acceleration (L3)

2 Pages

Physical Sciences
Course Code
PSC 1121

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Speed & Acceleration International System of Units (SI) Average and Instantaneous Speed Average Acceleration Acceleration of gravity In physics there are 3 basic quantities that are the basis for everything Length: Time: o Distance/time o Average speed is distance traveled divided by the time used o Speed is m/s. Average speed: distance/time o Instantaneous speed: the real speed at any moment Not necessarily constant over time o Length of a smaller distance. Mass: The quantity of matter in an object. o Measure of the inertia that an object exhibits in response to any effort made to start it, stop it, or change its state of motion in any way o The quantity of particles within an object o Weight is not a property o To compare the inertia, or mass, of two objects, accelerate them side-by-side. The book that requires the most force is the one with the larger mass We understand all these quantities from experiences but we find very hard to define. Quantity Unit Symbol Length Meter m Time Second S Mass Kilogram Kg Speed Meter/second m/s Acceleration Meter/sec^2 m/s^2 The meter, second and kilogram are called base units in SI o Other units are expressed in terms of them Speed To find a speed requires the measurements of length and time Average speed is distance traveled divided by the time used
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