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# Acceleration

In this lesson, You will be able to describe the motion of an object as it accelerates. You will be able to calculate acceleration. You will be able to describe what graphs are used to analyze the motion of an accelerating object.
by

## Mr. Duke

on 17 March 2015

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#### Transcript of Acceleration

Acceleration
In this lesson...

You will learn how to describe the motion of an object as it accelerates.

You will learn how to calculate acceleration.
Key Vocabulary:
acceleration:
change in velocity over time.
accelerate:
speeding up.
decelerate:
slowing down
or negative acceleration.
Constant velocity
: traveling at same speed and direction; zero acceleration
What is acceleration?
it is a
vector
with magnitude and direction
acceleration = change in velocity over time
Example: Plane Taking Off
Initial Velocity = 0 m/s

Final Velocity = 40 m/s
Initial Time = 0 s

Final Time = 5 s
Example: Roller coaster Speeding
Initial Velocity = 4 m/s

Final Velocity = 22 m/s
Initial Time = 0 s

Final Time = 3 s
How do you graph acceleration?
Distance vs. Time Graphs
slope = velocity

Speed vs. Time Graphs
slope = acceleration
Distance vs. Time Graphs
Speed vs. Time Graphs
Acceleration
measures how much something speeds up or slows down over a period of time.

definition
: the rate at which velocity changes over time.
25
50
0
In this lesson...
You will be able to describe what graphs are used to analyze the motion of an accelerating object.

0
1
2
3
4
5
1
2
3
4
5
Example: Car Slowing Down
Initial Velocity = 25 m/s

Final Velocity = 0 m/s
Initial Time = 0 s

Final Time = 5 s
0 m/s - 25 m/s
5 s - 0 s
=
constant velocity of 200 cm/s, but ZERO acceleration
Example of Acceleration
Velocity

Time
0 mph
0 s
10 mph
20 mph
30 mph
40 mph
1 s
2 s
3 s
4 s
10
10
10
10
acceleration = 10 mph/s East
Velocity can change in three ways:

1. Speed up (accelerate)

2. Slow down (decelerate)

3. Change direction
NorthWest
SouthEast
6 m/s/s
8 m/s/s West
-5 m/s/s
27.2 mph/s
How do you calculate acceleration?
Lamborghini

Which car has better acceleration?
0-100 km/h in 2.9 seconds.
0-200 km/h in 9.5 seconds
Ferrari
A bicycle rider increases his speed from 5 m/s to 15 m/s in 10 seconds.
15 - 5
10 - 0
=
1 m/s/s
Vi = ? Ti = ?
Vf = ? Tf = ?
Acceleration =
Vf - Vi
Tf - Ti
Vf = final velocity
Vi = initial velocity
Tf = final time
Ti = initial time
A plane starting from rest is accelerated North to its takeoff velocity of 75 m/s during a 5 second period.
Vf = ? Tf = ?
Vi = ? Ti = ?
75 - 0
5 - 0
=
15 m/s/s
A ball rolling down a hill for 9 seconds accelerates from 3 m/s to 34.5 m/s.
34.5 - 3
9 - 0
=
3.5 m/s/s
Full transcript