Units 1 and 2

Some Vocabulary

Distance DOES NOT equal Displacement

Distance = total area traveled
Displacement = final position in comparison to initial position
Speed= the time at which it takes to move a certain distance
Velocity= Speed with direction. VECTOR
Velocities are vectors.
Treated like lines on map
added together one at a time in order to gain correct distance.

Kinematic Equations:

Vf = Vi + at
Vf^2 = V^2 + 2ad
d= vit + .5at^2

Position versus time graphs
Slope = velocity

Velocity versus time graph
Slope = acceleration

Area under graph = distance

Acceleration versus time graph
Area under = veloctity

Multiply base by the power
Lower power by 1

radial motion.
Acceleration due to gravity is 9.8 x 10^-8 m/s^2
In circles though the acceleration is found to be the velocity squared divided by the radius of the circle

Forces acting in directions
Forces act in one direction and can cancel out but cannot if perpendicular

Investigations we have done:
Timing a ball drop
In this we saw how long it took to drop certain objects and to see that mass does not matter
Marble across a table into cup
In this we studied the idea that a marble in mid air has the same x direction velocity as it does throughout projection because the only force acting upon it is in the y direction

Multiple Choice:

1) A marble is rolled across a table at velocity 4 m/s. if the marble then accelerates at 2 m/s^2 for 7 seconds, what is the total distance traveled by the marble?
a)64 m/s
b)77 m/s
c)87 m/s
d) O m/s
e) none of the above

2) A marble is rolled across a table at a velocity of 4 m/s. If the marble then decelerates at 2 m/s^2 for 7 seconds, what is its final speed?
a) 10 m/s
b) o M/s
c) -10 m/s
d) 5 m/s
e) -5 m/s

3) radial acceleration is indirectly proportional to
I) Diameter of the circle
II) Square root of the velocity
III) gravitational pull
a) I only
b) II only
c) I III
d) I II
e) none of the above

Open Response

A Train is moving down the tracks at 55 m/s easy . You are on the train
a) if you begin to run at 4 m/s east, how fast would it appear you were going from an outside observer
b) If at the east most part of hte train, you ran 4 m/s for 3 seconds then jumped, how far would you have traveled
c) if you run 7 m/s 45 degrees north of east, what would ur velocity appear to be relative to the floorboards? the tracks? an outside observer?
d)if the train begins to decelerate at 4m/s^2 as you start to run west at 3 m/s what is your distance traveled in 5 seconds by someone viewing from the south.