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# PS U1

### Newton's First Law Inertia

Distance How far you have traveled between two positions. It is a Scalar quality. It is always positive
Displacement change in position. It is the straight line distance between your starting position and ending position. Can be positive or negative. it is vector quality
Scalar quality that only requires magnitude ( how big)
Vector quality that requires both magnitude and direction
Speed How fast something is moving. It is equal to distance divided by time.
Velocity Rate at which position changes. it is equal to displacement divided by time
Newton's 1st Law AKA law of inertia a object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction.
Mass a measurement of the amount of matter an object contains also 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 An applied force is a force that is applied to an object by a person or another object.
Gravity Force The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself.
Normal Force The normal force is the support force exerted upon an object that is in contact with another stable object.
Friction Force he friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it.
Air Resistance The air resistance is a special type of frictional force that acts upon objects as they travel through the air.
Tension Force Force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.
Spring Force Force exerted by a compressed or stretched spring upon any object that is attached to it.
Created by: 20066