unit 2 Flashcards
change in an objects position relative to a reference point
motion
coordinate system in which the position of the object is measured
frame of reference
distance and direction of the objects change in position
displacement
the location of an object in relation to a ref. point
position
the distance an object travels per unit of time
speed
what is any change over time?
a rate
what is the speed equation?
speed(m/s) = distance(m)/ time (s)
s = d/t
what is constant speed?
when an object neither speeds up or slows down
what are terms for changing speed?
average or instantaneous speed
what is average speed?
total distance travelled by total time travelled
what is instantaneous speed?
how fast an object is moving at 1 point in time
when graphing motion, what goes on the x and y axis? what represents the slope?
time - x axis
distance - y axis
speed
speed of object and direction of motion
velocity
can velocity change if the speed stays the same?
yes
true or false:
2 objects cannot have the same speed and different velocities
false; they can
what causes the movement of earth’s landmasses and oceans?
movement of earths plates
what effects how we describe motion?
moving reference point
what 2 factors always depend on the point of ref. chosen?
velocity and position
the product of objects mass and velocity
momentum
what represents momentum
p
momentum equation
momentum(kg x m/s) = mass(kg) x velocity(m/s)
p = mv
momentum has size and _____
direction
true or false:
momentum is always in the same direction as velocity
true
true or false:
object with less mass has greater momentum
false; more mass
true or false:
if 2 objects have the same mass, the object with larger velocity has more momentum
true
rate of change of velocity
acceleration
change in velocity = change in ___ or _____
speed; direction
true or false:
acceleration has direction
true
when graphing acceleration what does the slope represent?
object’s acceleration
acceleration equation
acceleration(m/s^2) = change in velocity(m/s)/ time(s)
a = vf -vi/ t
acceleration toward the center of a curved or circular path
centripetal acceleration
when anything is thrown or shot in the air, it is called ____
projectile
true or false:
projectile follows a straight path
false; curved
