1. Definition: Strength or energy as an attribute of physical action or movement.
2. Balanced forces: Forces are just pushes and pulls in a particular direction. Forces are shown by arrows in diagrams. The direction of the arrow shows the direction in which the force is acting. The bigger the arrow, the bigger the force. If two forces are balanced, it means the forces are the same size but are acting in opposite directions.
3. Springs When a spring is stretched or squashed, it creates a force in the opposite direction because the spring tries to get back to its original shape
4. Unbalanced forces: Unbalanced forces do change the way something is moving. Unbalanced forces can make objects start to move, speed up, slow down, or change direction.
5. The force that makes things fall to the ground on Earth (and other planets) is called gravity.
6. Mass and weight: The mass of an object is how much matter it contains. It is measured in grams (g) or kilograms (kg) but is NOT a force. The weight of an object is the force caused by gravity pulling down on the mass of an object. It is measured in newtons (N).
7. Force is a quantity that is measured using the standard metric unit known as the Newton.
