in more and more sophisticated ways.

Newton's 2nd Law

You hit a handball to apply ato it. That force accelerates it. "Accelerate" doesn't mean "go faster." Forget that oversimplified meaning: this is the elementary physics of the real world, not adolescent fantasy in the hot-rod world.force

means the rate of change of velocity. It has a magnitude, and it has a direction. Acceleration might be a decrease in speed, if it's direction opposes that of the velocity.AccelerationThe

and theforceare related to each other by only a constant of proportionality. They are in the same direction. If you double one, the other doubles, too. So, if you know the value of one, you can calculate the value of the other. (The constant of proportionality isaccelerationdefinedas theof the ball.)mass(Yes, there is a hidden complication or two: the force of gravity acts on the ball, too, as does a bit of air friction as the ball moves through the air.) F= maSo, if you aren't sure of, say, the direction of the acceleration, just think about the force you are putting on the ball when you do the accelerating.

SEEINGISA MATTER OF LOOKINGIN THE NEEDED WAYS

BUT UNTIL WEDEVELOP THE NEEDEDPERCEPTION, WE WILLNOT "SEE."