Physics- Unit 3 Acceleration
Final Velocity
final velocity = Initial velocity + acceleration(times time) vf= vi+at
Average Acceleration
velocity/time v/t
Constant velocity
xt-xi/ tt-ti
Constant acceleration; average acceleration, instantaneous acceleration
3 types of Acceleration
Model Graphs
Acceleration in motion graphs and particle
Vector
Acceleration is a ___________ quanitity
Acceleratoin
Acceleration= Final Velocity + Intial Velocity divided by 2 times time a= (vf+vi/2) x t
Distance
Distance = Initial velocity times time + 1/2 acceleration times time squared d= vit+1/2at2^
vt-vi / tt-ti
Equation: a= Change of velocity divided by the change of time=
Final Velocity Squared
Final velocity squared= intial velocity squared + 2 times acceleration times distance vf^2= vi^2 +2ad
acceleration
In a vaccum, all bodies fall with the same ___________
(negative velocity, positive acceleration)
In the same car you apply the brakes
Acceleration
Is the change in velocity per unit time. (or rate of change in velocity)
Free Falling bodies
Motion decribed by Gailileo
m/s/s , mph/s, m/s^2
Note two time units :
Terminal Velocity
Other than in a vaccum, air resistance, friction, creates an upward force. When the upward force balances the downward force of gravity, there is no acceleration; velocity is constant. This value is called
-9.8 m/s^2
The acceleration due to gravity at sea level is
Acceleration
The slope of the velocity-time graph is the
v= vt+vi/2
Usual meaning of average velocity use only wih acceleration motion
This rise and fall is symmetrical
When an object is thrown upward, it rises until the negative acceleration of gravity brings it to a stop for an instant. Thereafter it accelerates in the downward position.
(positive velocity, negative acceleration) (deceleration)
You are driving 40 mph and slow down to 25 mph
(positive velocity, positive acceleration)
You are driving 40 mph and speed up to 60 mph
(negative velocity, negative acceleration)
You are stopped on a hill you start backwards down the hill, going faster and faster
x=1/2g(t^2)
You use the velocity equations, but replace "a" with "g"
Average Velocity
d=vt
Velocity as function of time
v=vo+at