Describing Motion with Equations

Thursday October 2, 2014
The motion of objects can be described by words, with images, as well as with the language of math by using graphs, charts, and equations.

We've already learned about the p-t and v-t graphs in our experiments, and now it's time to figure out the kinematic equations that will describe the motion of objects by relating the time, distance, displacement, velocity, speed, and acceleration. They're a really handy set of four equations that you can use to figure out how fast you're moving in a swing, how far your car will skid, the height your rocket will reach, or how far your baseball will go.

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Kinematic Equations Example Problems

Thursday October 2, 2014

Let’s try another example problem so you can see how to apply the equations to solve for things you really want to know…
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Using Two Methods Together

Thursday October 2, 2014

Once you get the hang of how to solve the four kinematic equations, you can put this together with your understanding of the v-t and p-t diagrams to make a more complete picture of the motion in your system. Remember how we learned that the slope of the line on a v-t graph is the acceleration of the object, and that you could use the area bounded by the axis and the slope to find the displacement? Now you’ve got two ways of figuring out the displacement, velocity, acceleration, and time in any problem. How can you use the two methods together to make you more efficient and effective at solving physics programs? Here’s how…
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