Science concepts

By Michelle

Inertia

an object will keep moving unless an unbalanced force acts on it. If she happened to crash into a huge semi, she would probably get seriously injured or even die, but her seatbelt would stop her from getting even more hurt.

Newton's law of universal gravitation

everything exerts gravitational force. Gravity is the force thet pulls you towards the center of the earth. You are sitting at your computor right now because of this law.

Momentum

mass+speed=momentum. The more something weighs, the more momentum it has. The baseball in this picture has more momentum than a basketball because it weighs more.

Weightlessness

when you can not weigh yourself, you feel weightlessness. These astronauts feel weightlessness because they cannot detect their weight.