Dangle the spring and drop it while someone is recording your slow-motion video. In real time, it doesn't look like much is happening, but in slow motion, the bottom of the spring defies gravity ...

What if we look at the motion of a spring in just a very, very short time frame? In that short time frame, I can use the momentum principle to describe the change in motion of the mass.

Why is pancake syrup an example of a resistive force? Some forces are called contact forces because they require objects to touch. One is tension force, found in stretched wires. Another is the ...