We now finally get to our first real set of physics equations! Make sure that you understand the meanings of all of the symbols in the equations below, and follow the examples that follow. These equations will take us far in this course, so come to know and love them!
The four 1D (onedimensional) kinematic equations of motion are a set of equations which relate the initial and final positions, velocities, acceleration and time to one another. It will be very important to keep in mind that the following kinematic equations only apply to cases in which the acceleration is a constant!
Consider an object which is at the position x_{i} at the time t = 0. At this time it has an xcomponent of velocity v_{ix}. At some time t later, the object is at the position x_{f} and is traveling with the velocity v_{fx}. During this entire time interval the object is moving with a constant acceleration a_{x}. Under these conditions, the following four 1D kinematic equations will correctly describe the motion of the object.
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Equation

Missing

1


v_{fx}

2


a_{x}

3


x_{f}

4


t


Some notes on solving 1D kinematics problems are in order before we proceed with the following examples. Click on the “Solving Probs” button at the upperleft to view the notes on Solving 1D Kinematics Problems.
