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# ps unit 1

### newtons first law, inertia and motion

TermDefinition
Distance how far you have traveled between two positions. 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 how bid and direction
speed how fast something is moving. it requires distance divided by time. It is a scalar
velocity a rate of which position changes. It is equal do displacement divided by time. it is a vector quantity
Newton's first law AKA the law of inertia. an object at rest will stay at rest and an object in motion will stay in motion unless acted on upon an external force
mass a measure of the amount of matter an object contains. also a measure of the amount of inertia it contains.
inertia the Resistance an object to changes in motion.
force any push or pull that causes a change in motion.
Created by: jackyr