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# PS Unit 1

### Newtons first law,inertia, and motion

TermDefinition
Distance How far you travel 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 directions
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.
Applied Force An applied force is a force that is applied to an object by a person or another object.
Gravity Force Force that attracts any object with mass.
Normal Force The component, perpendicular to the surface of contact
Friction Force Resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Air Resistance force the frictional force air exerts against a moving object
Tension Force the pulling force exerted by each end of the string.
Spring Force the force exerted by a compressed or stretched spring upon any object that is attached to it
Created by: landenclay