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# PS UNIT 1

### NEWTONS 1ST LAW, INERTIA, AND MOTION

TermDefinition
Distance How far you have traveled between two positions. Its 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 and directions.
Speed How fast something is moving. It is equal to distance Divided by time. It his a scalar quantity.
Velocity Rate at which position changes. It is equal to displacement divided by time. It is a vector quantity.
Newtons 1st Law AKA the 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 an unbalanced force.
Mass A measure of the amount of matter an object contains. Also, a measure of the amount of inertia an object has.
Inertia The resistance an object has to change in its motion.
Force Any push or pull (interaction) that can cause a change in motion.
Applied Force (FF) The support force exerted upon an object that is in contact with another stable object. It is in the direction of the push and pull.
Normal force (FN) A contact force that is exerted by a surface against an object that is pressing against the surface. It is perpendicular to the surface and present what ever atoms are being "crunched". AKA "crunchy force".
Tension force (FT) Contact force exerted by a taut string,rope, or wire object. It is along the rope and present whenever a rope is a taut.
Friction force (FF) The force exerted by a surface as an object moves across it or makes an effort to move across it. It is parallel to the surface in the direction opposite of the motion or attempted motion.
Air Resistance/Drag (Fd or Fair) a special type of frictional force that acts upon objects as they travel through the air/fluid. It is in the opposite direction of the motion of the object.
Spring (Elastic) Force (Fs) 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 (Fthrust) A contact force that is exerted in the opposite direction of an exhaust gas being expelled.
Created by: AlyssaShepard