Air resistance - Also called drag: friction that acts on an object moving through the air., Balanced Force - Forces that are equal in size but opposite in direction, Contact force - Force that acts between two objects that touch or are in contact, Force - A push, pull or a twist that can change an object’s motion, Friction - The force that works against an object as it slides along the surface of another object or moves through a liquid or gas., Gravitational field - The area around a body in which another body experiences a force of attraction OR invisible field that causes masses to be attracted to each other, Gravity - Force that pulls objects towards the centre of any mass OR The force that pulls objects to the centre of the Earth, Mass - How many particles or atoms make up an object OR The amount of matter in a substance (measured in kg), Newton (N) - Unit used to measure force, Non-contact force - Force that acts on an object from a distance, Unbalanced Force - Forces that cause a change in the motion of an object, Weight - A measure of how much gravity is pulling on an object OR The force of gravity pulling on an object (measured in N),

Physics Glossary

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