Newton's Second Law in the Parking Lot

The freshman physics students learn that the real meaning of mass is an object's resistance to changing velocity—the larger its mass, the less it will accelerate for a given push.
They attempt to measure the mass of a cart and rider (the "jockey") by pushing the cart using a bathroom scale through the parking lot. The jockey makes chalk marks on the ground every second. By noting the pounds of force with which they are pushing the cart, and by determining the acceleration based on the distance between chalk marks, students are able to calculate the mass of the cart+jockey using Newton's Second Law (∑F = ma).
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mens conscia recti

a mind aware of what is right