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chapter 7
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Gravity
Key Concepts:
Terms in this set (19)
Motion
change in position
elapsed time
the time that has passed since the beginning of an event
speed
The distance an object travels per unit of time
distance
The length of a path between two points
constant speed
Speed that does not change
Velocity
the speed and direction of a moving object
Formula of speed
s=d/t
Formula of distance
speed x time
Formula of time
t = d/s
Accerleration
rate of change of velocity
Deceleration
slowing down
Force
A push or a pull
Friction
A force that opposes motion between two surfaces that are in contact
Inertia
object at rest stay at rest
Newton's First Law
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 by an unbalanced force.
Newton's Second Law
Force = mass x acceleration
Newton's Third Law
For every action force there is an equal and opposite reaction force
Gravity
A force that pulls objects toward each other
law of universal gravitation
states that every object in the universe attracts every other object
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