Science - Physics

Physics deals with questions about electricity, energy, magnetism and forces.

He was the first person to discover that: every atom is mostly empty space. And that every atom has a small, dense, positively charged center called a nucleus.

A force is a push or pull.

Force is measured in Newtons (N).

When forces are balanced there is either no movement or the object travels at a constant speed.

When the forces are unbalanced the object is either accelerating or decelerating.

The four forces are: Thrust (Push), Friction (Pull), Lift/Support (Up) and Gravity/Weight (Down).

Weight is the force that an object is attracted towards. It differs when the gravitational force changes. A spring balance measures weight.

Mass is the amount of matter in a body, and is also the space an volume the body takes up. The mass of an object does not change. Mass is weighed by an ordinary weighing balance.