Everyday Physics

Why does a ball bounce off the ground?

Have you ever wondered why a ball bounces back when you drop it on the ground? Newton’s Third Law of Motion gives us the answer: Every action has an equal and opposite reaction. When the ball is released by you, it is pulled by gravity and starts going faster and faster.When it reaches the ground,… Continue reading Why does a ball bounce off the ground?

Everyday Physics

What Is Physics?

Physics is the branch of science concerned with the properties of matter and energy. Physics includes various subjects like heat, light, mechanism, sound, electricity, magnetism and structure of atoms. The purpose of physics is to find ways to explain everything – from the tiniest particles to the largest stars, galaxies and objects known to man.… Continue reading What Is Physics?

Magical Physics

General Relativity and light bulbs

Q: How many general-relativity theorists does it take to change a light bulb? A: Two. One to hold the bulb and one to rotate space. This one is based on Einstein’s General Relativity. Before Einstein, physicists tried to explain motion and everything in relation to a certain point of view, called the Frame of Reference.… Continue reading General Relativity and light bulbs