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Ch. 2 Review
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Gravity
Terms in this set (56)
motion
change in an objects position relative to a reference point
displacement
distance and direction of the objects change in position
speed
distance divided by time
velocity
speed of an object and the direction of its motion
momentum
product of its mass and velocity
acceleration
rate of change of velocity
centripetal acceleration
acceleration toward the center of a curved or circular path
how do you know if something has moved
position relative to a point changes
motion occurs when.....
objects go from one reference point to another; change in position
distance
how far something moves
SI unit: meter
if a runners direction does not change then ....
distance and displacement are equal
if a runners direction does change the.....
distance and displacement are not equal
what are the 3 rules for adding displacement
1. add displacements in the same direction
2. subtract displacement in opposite directions
3. displacement that are not in the same or opposite direction cannot be directly added
Rate
any change of time
speed (SI unit)
m/s
constant speed
object that neither slows down or speeds up
speeds are rarely ............. they are most often..........
constant; changing
what are two ways to describe speed
average and instantaneous speed
average speed
speed of motion when speed is changing (total distance taveled/ total time of travel
instantaneous speed
speed at a given point in time
distance time graph
1. shows the motion of an object ...............
over a period of time
distance time graph
2. time is on the .....
x-axis
distance time graph
3. distance is on the ............
y-axis
speed on a distance time graph
1. if an object is moving at a constant speed the increase in .......... per amount of time will be the same. The line will be ........
-distance
-straight
speed on a distance time graph
2. is an object has a speed that is changing the increase in .......... per amount of time will also be ........... The line will NOT be.............
distance
changing
straight
velocity SI units
m/s + direction
velocity can change even if the speed remains constant. How? Why?
change in direction
constant velocity
speed and direction stay the same
relative motion
way to describe motion, one thing moves relative to another
momentum formula
p = m x v
momentum SI unit
kg m/s
if 2 objects have the same mass, the one with greater velocity has ..........
greater momentum
if 2 objects have the same ............, the one with the greater mass has the greater momentum
velocity
3 ways an object ca accelerate
speeding up
slowing down
changing direction
positive acceleration
speeding up (airplane)
negative acceleration
slowing down (cars stopping at a red light)
changing direction
race car
When an object moves at a constant velocity (it does not slow down, speed up or change direction) the ............ is zero
acceleration
formula for acceleration
velocity(final) - velocity(initial) / time
acceleration SI units
m/s^(2)
occurs when an objects velocity decrease
negative acceleration
theory that describes movement of land masses
plate tectonics
movement of a stationary object
relative motion
name for the slant of a line on a graph
slope
distance divided by time
speed
total distance divided by total time
average speed
distance and direction of an object from its starting point
displacement
product of an objects mass and velocity
momentum
measure of how far an object has moved
distance
speed and direction of motion
velocity
rate of change of position at a specific point in time
instantaneous speed
the rate of change in velocity
acceleration
compare and contrast distance and displacement
distance is going in one direction; displacement is opposite directions
compare and contrast speed and velocity
speed is distance divided by time; velocity is speed in a certain direction
difference between positive and negative acceleration
(+) acceleration is speeding up
(-) acceleration is slowing down
what is a frame of reference
origin (used to measure the position of other things)
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