# Hands-On-Physics MECHANICS

## - Speed -

Use single time interval measurements to find the average speed of several moving objects
• A Running Person
Two measurements are needed, the distance travelled and the time required. You can choose a distance (independent variable) and measure the time (dependent variable), or choose a time (independent variable)and measure a distance(dependent variable).

• A Falling Object
Drop something. Because speed gets large quickly, you may need to drop from a height to get a longer time. You can probably see that the speed is changing here. From your determination of average speed can you estimate the speed just before hitting the ground?

• A Thrown Object.
Here you must let both distance and time vary freely and measure the outcome. Can you determine how high the object is thrown? This complicated two-dimensional motion is sometimes analyzed by considering the horizontal motion and the vertical motion separately. The horizontal speed is rather easy; the speed vertical is more difficult. What can you determine?

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