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physics chp 4 unit test
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Gravity
Terms in this set (34)
how can you describe the motion of an object
motion, position, speed, direction, and acceleration
how can you tell an objects moving
if its position relative to a fixed point is changing
how do you describe the motion of an object compared to the motion of another object
the motion is relative
speed is most of the time relative to
earth
speed is calculated by
distance/ time
galileo
was the first one to mesure speed in a given distance divided by time
speed
how fast an object is moving
speed units
distance per unit of time
instantaneous speed
the speed of an object at any instant
average speed
total distance covered divided by time
total distance covered formula
average speed x time
velocity
how fast and in what direction an object moves
vector quantity
specifies direction as well as magnitude
scalar quantity
only magnitude
acceleration formula
change in V divided by time
acceleration
the rate at which velocity changes
acceleration applies to both
decreases and increases in velocity
acceleration is what type of quantity
vector
acceleration units
distance/time2
acceleration of an object in free fall
10m/s2 (gravity)
what affects the acceleration of objects in free fall
air resistance
free fall
an object moving under the influence of gravity only
elapsed time
the time that has passed since the begging of motion
what does g stand for
gravity (10m/s2)
velocity formula for falling objects
v = gt
at the highest point of a rising object when its position is changing from upward to downward its instintanious speed is
zero
for each second of free fall what happens to the distance
it increases
the formula for distance of a falling object
d = 1/2gt2
on a speed vs time graph the slope represents
acceleration
slope
vertical change / horizontal change
on a distance vs time graph the relationship is
quadratic
on a distance vs time graph the curve is
parabolic
how does the surface area of an object affect the speed when theres air resistance
the larger the surface area the slower it goes
air resistance is non relevant in
a vacuum
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