phys1111 ch2 notes - CHAPTER 2 KINEMATICS IN ONE DIMENSION...

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CHAPTER 2 KINEMATICS IN ONE DIMENSION Kinematics - deals with the description of motion without analyzing the causes of changes in motion. Dynamics - deals with the effect forces have on motion. Mechanics includes both kinematics and dynamics. Displacement - a vector drawn from the initial position to the final position. X f = X o + Δ X or Δ X = X f - X o Bold Italics indicates vector quantities and all of the displacements in the preceding line are vectors. Speed is a scalar quantity indicating how fast an object is moving but not specifying a direction. average speed = distance/time V = D/t The units are often meters per second but can be any unit of distance per unit of time. Instantaneous speed is also distance divided by time if the time interval approaches zero. Average velocity = displacement/time
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V ave = Δ X /Δt This is a vector quantity since both displacement and velocity have a direction. We normally consider displacements and velocities to the right to be positive. If they are to the left, they are negative. Instantaneous velocity is also displacement divided by time if the time increment approaches zero. Generally we will be dealing with average speed and average velocity. "Speed" will mean average speed and "Velocity" will mean average velocity. Average acceleration is the change in velocity per unit of time. Since velocity is a vector, acceleration is, too. a = ( V f - V o )/Δt The SI unit for acceleration is m/s 2 .
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If the acceleration is constant, the average acceleration equals the instantaneous acceleration during the motion. We will be working with constant acceleration when we work problems. Consider an airplane starting from rest and accelerating to 260 Km/
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This note was uploaded on 04/20/2008 for the course PHYS 1111 taught by Professor Baskins during the Fall '07 term at Valdosta State University .

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phys1111 ch2 notes - CHAPTER 2 KINEMATICS IN ONE DIMENSION...

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