Physics CH. 2 - Motion is one demension
the acceleration for falling objects is always
-9.8m/s2
when an object is dropped vi=?
0, Vf has to be negative
when an object is thrown up vf=?
0, Vi has to be positive
True statements about acceleration
1. acceleration is a vector quantity 2.acceleration object must be changing their speed 3. The direction of the acceleration vector is dependent upon two factors: the direction the object is moving and whether the object is speeding up or slowing down 4. An object which is slowing down has an acceleration 5. An object which is moving at constant speed in a circle has an acceleration 6. Acceleration is the rate at which the velocity changes 7. An object that is moving rightward and speeding up has a rightward acceleration
Which of the following statements about vectors and scalers are TRUE? List all that apply 1. A vector is a large quantity and a scalar is a small quantity 2. A scalar quantity has a magnitude and a vector quantity does not 3. A vector quantity is described with a direction and a scaler is not 4. Scalar quantities are path dependent quantities and vector quantities are not 5. Scalar quantity depends only upon the initial and final values of the quantity; this is not the case for vector quantities. 6. The quantity 20m/s, north is a speed and as such us a scalar quantity 7. The quantity 9.8m/s is an acceleration value and as such is a vector quantity.
3 and 7
what is not consistent with a car which is accelerating
a car is moving with a high speed
when the velocity of an object changes at a constant rate, it has a constant ____________
acceleration
average acceleration
an object is the change in velocity during some measurable time interval divided by that time interval
when you are in uniform motion and your eyes are closed, you fell ____________________
as though you are not moving at all
the absolute value of the slope of a position-time graph tells you the _________ of the object
average speed (how fast the object is moving)
slope =
change in position divided by the time interval during the change took place
average acceleration is = to
change in velocity, divided by the time it takes to make that change
if an object has an acceleration of 0m/s2, then one can be sure that the object is not______
changing velocity
examples of vectors
displacement, velocity, acceleration
examples of scalars
distance, time, or temperature
Displacement is....
equal to the final position minus the initial position
where does the resultant always point
from the tail of the first vector to the tip of the last vector
how can an object have a different distance traveled and displacement
if you start at one spot and end at the same spot you can have a distance of 15 m and a displacement of 0m
the length of how far an object is from the origin indicates.....
its distance from the origin
what does a negative mean for temperature
less than 0
what does a negative number not mean for distance
less than/slower
unit for slope
m/s
acceleration unit
m/s^2
length relates to _________
magnitude
3 things about velocity
measured in m/s, its a vector, slope of a position vs time graph
in an object moves in the _________ direction then its displacement is negative
negative
does a negative acceleration mean slowing down
no it means acceleration is in the negative direction
a description of motion relates to _________and______________
place and time
what does an arrow do
points from the origin to the location of the moving object at a particular time
when an object is in motions its __________ changes
position
how can you tell if something is moving
position relates to a certain point that is changing. if the background is moving too. reference to where other things are
when you move in a nonuniform motion you feel________or _________
push or pulled
scalars
quantities that ar just numbers without any direction
vector
quantities that have both size (magnitude) and direction. (represented by arrows)
what is acceleration
rate change of velocity
how do you subtract vectors
reverse the subtracted vector and then add the two vectors
the objects velocity will always have the same __________ as the objects displacement
sign
when the direction of velocity and acceleration are opposite, the object is
slowing down
when direction of velocity and acceleration are the same, the object is ____________
speeding up
Coordinate system
tells you the location of the zero point of the variable you are studying and the direction in which the values of the variable increase
instantaneous acceleration
the change in velocity at an instant of time
origin
the point at which both variables have the value zero
acceleration
the rate at which an objects velocity changes
instantaneous velocity
the speed and direction of an object at a particular instant
resultant
the vector that represents the sum of the other two vectors
what does slope tell us
the velocity
you can feel a difference between _______ and _______ motion
uniform and nonuniform
compare and contrast vector and scalar quantities
vector = both size and direction scalar=are just numbers without direction
describe a situation where the acceleration of an object can be negative but the object is speeding up
when the velocity and acceleration are both negative
independent variable is on what axis
x axis
dependent variable is on what axis
y axis
