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# Sci Vocab Unit 2 6AB

### Unit 2 Vocabulary

QuestionAnswer
MOTION When one objects distance from another is changing
SPEED The distance an object travels per unit of time. D/T Ex. 50 m/p/hr
REFERENCE POINT A place or object used for comparison to determine if something is in motion
FORCE A push or pull on an object - strength and direction
SPRING SCALE This is used to measure force
NEWTON (n) A unit used to measure force (n)
FRICTION A force that resists the motion of one object sliding over another
VELOCITY Speed in a given direction Ex. 30ft per/sec West
SLIDING FRICTION Two solid surfaces sliding over each other Ex. pushing a box on a floor
STATIC FRICTION Friction that acts on objects that are not moving Ex. a book on a ramp
ROLLING FRICTION When an object rolls over a surface Ex. cart, bike
GRAVITY A force that pulls objects towards each other
WEIGHT Strength of the gravitational force
ACCELERATION The rate at which velocity changes
BALANCED FORCES Equal forces acting on one object in opposite directions. Ex. Pushing on a box equally: 5N → ❒ ← 5N, this will give you a Net force of 0.
UNBALANCED FORCES Unbalanced forces cause an object to start moving, stop moving, or change direction. Ex. Pushing on a box with more force on one side: 10N ⎯→ ❒ ← 5N, this will give you a Net force of 5.
WHAT is NEWTON'S 1st LAW of MOTION? An object at rest will remain at rest and an object moving at a constant velocity will remain at a constant velocity UNLESS it is acted upon by unbalanced forces. Ex. A ball moving that hits a wall, a pencil moves when you pick it up.
INERTIA Tendency to resit a change in motion. Ex. Running and stopping, tennis ball in a circle, stopping a car.
SATELLITE Any object that orbits (goes around) another object in space. Ex. planets & the moon are natural satellites
What is the MEAN of a set, or group of numbers? The average number - found by adding all the numbers in a group/set & dividing by the sum by the numbers you started with. Ex. Add the set 2, 4, 6, 8 it =20 - now divide 20 by the number of numbers you added, which is 4. Your Mean or Average is 5.
What is the MEDIAN of a set, or group of numbers? The middle number when a group/set of numbers is listed in order from least to greatest. Ex. In the group/set of 2, 4, 6, 8, 10, The middle or MEDIAN number is 6.
What is the MODE of a set, or group of numbers? The number that occurs most often in a set/group of numbers. Ex. In the group/set of 2, 4, 5, 5, 7, 8,8, 8 - The MODE, or the number that occurs the most is 8.
What is the RANGE of a set, group of numbers? The difference between the greatest value and the least value in a set of data. EX. In the set 2, 4, 6, 8 you would subtract 2 from 8 to get the RANGE which is 6.
Created by: bigelowtafm114