Physics II Day 11: Calculating Acceleration
We are calculating acceleration
today (since we already know how to calculate velocity). What’s the difference?
Concept
|
Definition
|
How?
|
Formula
|
Units
|
Velocity (Speed)
|
Distance traveled over
a certain amount of time in a certain time.
|
Calculated by dividing distance by time
|
S
= d ÷ t
|
Unit is meters per second
|
Acceleration
|
Change in
speed over a certain amount of time.
|
Calculated by dividing change in speed by time
|
a
= Vf - Vi
t
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Unit is m/sper second (m/s2)
|
Let’s Try As a Class: Which Car Should
You Buy&
A Ford Focus goes from 5 meters per second to 20 meters
per second in 5 seconds.
Diagram:
|
Formula:
|
What We Know:
Change in velocity:
______________
Time: __________________
|
Solve:
|
A Honda Civic goes from 18 meters per second to 26 meters per second in 10 seconds.
Diagram:
|
Formula:
|
What We Know:
Change in velocity:
______________
Time:
__________________
|
Solve:
|
This means that in one second, the Civic increases its speed by ___________ meters per second.
With Your Shoulder Buddy
Which truck should
we buy?
In 3 seconds, A Chevy Cheyenne can go from 5 m/s to 14
m/s. What is its acceleration?
Diagram:
|
 Formula: |
What We Know:
Change in velocity: ______________
Time: __________________
|
Solve:
|
In 5 seconds, a Nissan Titan can go from 0 m/s to 11 m/s.
What is its acceleration?
Diagram:
|
Formula:
|
What We Know:
Change in velocity:
______________
Time:
__________________
|
Solve:
|
One Last Practice…
When riding his Harley, Cristian accelerates as shown in
the following diagram.
A
B C
0 m/s 12
m/s 18 m/s
________________________________________________________________________
 |
|||||
 |
 |
||||
What was his rate of acceleration from point B to point
C?
On Your Own Practice
1) In 4 seconds, a scooter can go from 8 m/s to 16 m/s.
Diagram:
|
Formula:
|
What We Know:
Change in velocity:
______________
Time:
__________________
|
Solve:
|
.
This means that in
one second, the scooter increases its speed by ____________ meters per second.
2) When running in a race, Shanyn starts off at 0 m/s,
but is able to start moving at 1.26 m/s in just 3 seconds. What is her rate of
acceleration?
Diagram:
|
Formula:
|
What We Know:
Change in velocity:
______________
Time:
__________________
|
Solve:
|
This means that in
one second, Chloe’s speed increases by _______________ meters per second.
3) A penny is falling off of the skyscraper we visited
for the UH field trip. After 9 seconds, it has gone from moving at a speed of
10 m/s to 100 m/s. What is its rate of acceleration?
Diagram:
|
Formula:
|
What We Know:
Change in velocity:
______________
Time:
__________________
|
Solve:
|
4) A Bugatti Veyron can go from 0 m/s to 27.2 m/s in just
2 seconds. It is the fastest accelerating street-legal car you can buy. What is
its acceleration in meters per second?
What We Know:
Change in velocity:
______________
Time:
__________________
|
Solve:
|
5) A Dodge Viper accelerates from 0 m/s to 21 m/s in 2
seconds. A Corvette accelerates from 0 m/s to 44 m/s in 4 seconds. Which car
accelerates faster? (You must solve for both)
6) The diagram below shows how Mr. Miller accelerates in
his Camaro when he gets onto the highway.
A B C
20 m/s 27 m/s 31 m/s
_______________________________________________________________
 |
 |
||||
 |
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What is his rate of his acceleration from Point A to
Point C?
Quest
1. Complete the Study Jam - Acceleration by clicking here. Afterwards take the test, then answer the questions on your classwork.
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