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In high school physics class, we solved a lot of problems about dropping a ball in vacuum. But the real world has an atmosphere that … Read More

If you know about momentum then you can tell what is going to happen when two pool balls collid. Momentum combines an object’s resistance to … Read More

Physics problems start most of the time with a who-cares question: Where was something when it all went pear shaped? The answer is starting momentum. … Read More

The speed of sound vary with air temperatures; summer sounds are not the same as winter in a concert hall. Why? Sound waves has wavelengths … Read More

The principle is called kinetic energy, it’s the energy of movement. While a single grain of sand shot out of a revolver could shatter bone, … Read More

It is a numbers game. Hunting with a crossbow is a numbers game, but it isn’t forgiving. Manufacturers love to shout a single number like … Read More

When you slam on the brake, you experience sense of loss, and that’s explained by the work-energy theorem. That sense of loss arises from removal … Read More

Most introductory physics classes treats air as if it doesn’t exist. You toss up a ball at some angle and watch its path follow a … Read More

Whether it’s throwing a basketball into a hoop or tossing a ball for fun in the driveway, there are two invisible forces battling each other … Read More