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Published byDarren Bishop Modified over 5 years ago

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Kinematics Kinematics is the branch of physics that describes the motion of points, bodies (objects) and systems of bodies (groups of objects) without consideration of the causes of motion.

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Kinematics One-dimensional kinematics. Movement along one axis. Distance – the total distance traveled from beginning to end. It always has a positive value. A scalar quantity – completely characterized only by magnitude. Displacement – the change in position. A vector quantity completely characterized by magnitude and direction.

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Kinematics Average speed – distance divided by elapsed time. Average velocity – displacement divided by elapsed time. Some units for speed and velocity are and any unit of length divided by a unit of time.

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Kinematics Instantaneous speed – the speed at a given instant. Instantaneous velocity – the velocity at a given instant.

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Kinematics Average acceleration – the change in velocity divided but the change in time.

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Kinematics Instantaneous acceleration – the acceleration at a given instant.

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Kinematics Constant acceleration – when acceleration is constant, instantaneous acceleration is equal to the average acceleration. In this course we will only be dealing with situations involving constant acceleration.

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Kinematics In the following slide the subscript i refers to an initial condition, and the subscript f refers to a final condition.

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Table 2-4 Constant-Acceleration Equations of Motion Variables RelatedEquation Velocity, time, acceleration v f = v i + at Initial, final, and average velocity v av = ½(v f +v i ) Position, time, velocity d = ½(v f +v i )t Position, time, acceleration d = v i t +½ at 2 Velocity, position, acceleration v f 2 = v i 2 + 2ad

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