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# Physical Science 1

### Newton's First Law

TermDefinition
Distance How far you traveled between two positions. It is always positive. It is a scalar quantity.
Displacement Change in position. It is the straight line distance between your starting position and ending position. It is equal to final position minus initial position. It can be positive or negative. It is a vector quantity.
Scalar Quantity that only requires magnitude. (how big)
Vector Quantity that requires both magnitude. (how big) and direction.
Speed How fast something is moving. It is equal to distance divided by time. It is a scalar quantity.
Velocity Rate at which position changes. it is equal to displacement divided by time. It is a vector quantity.
Inertia The resistance an object has to change in its state of motion. (speed and direction)
Mass Amount of matter that an object contains. (a measure of the amount of inertia an object has)
Forces Any push or pull that can change an object's motion.
Newton's First Law Law of Inertia, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Force
Net Force
Balanced Force
Unbalanced Force
Gravitational Force
Applied Force
Normal Force
Tension Force
Friction Force The force exerted by a surface as an object moves across it or makes
Air Resistance A special type of frictional force that acts upon objects as they travel through the air/fluid. It is the opposite direction of the motion of the object.
Spring Force A contact force exerted on an object by a spring or elastic object when it is stretched or compressed. It is along the spring in a direction that would restore the spring/elastic material to its relaxed position.
Thrust A contact force that is exerted in the opposite direction of an exhaust gas being expelled.