• ACT/PSAE practice• Intro to acceleration–What does it mean in common language?–What does it mean to a physicist? (That’s you!)
• First equation of acceleration– A = v/t– Standard unit for acceleration: m/s^2
• Example Problem• HW: Acceleration WS #1– Be sure to convert km/h to m/s!
Agenda
• What is acceleration? When am I accelerating?
• Is acceleration a scalar or vector?• How do I solve a physics problem involving
Acceleration?• What does a position-time graph of
acceleration look like?• What are velocity-time graphs, and how can
I find distance travelled and instantaneous acceleration
Essential Questions for the Chapter
What does it mean to you in common conversation?
What is the book’s definition?
“Deceleration” is just acceleration in a negative direction
Acceleration
1. You run the 100 meter dash with an average velocity of 8 m/s. How long does it take you to finish?
2. Make a position-time graph of the following motion diagram:
(Line shows meters)
(Hint: how long did it take to go 10 meters?) 3. If your car can accelerate from rest to 20
m/s in 4 seconds, what is its acceleration?
Bellringer
When you fall, do you fall at a constant rate or accelerated rate? How do you know? Use complete sentences (UCS).
Bellringer
Collect Reaction Time Lab Bellringer Introduce Acceleration Equation #2:
◦ THE MONSTER!◦ df = ½ a* t^2 + Vyi * t + di◦ Example Problem
Acceleration WS #2◦ Due Wednesday
EQ: How does acceleration affect distance travelled?
Agenda 9/15
Already know: Acceleration = (Vf – Vi) / t How do we find displacement? Df = ½ a * (t)^2 + Vi * t + Di
◦ Df =◦ a = ◦ t =◦ Vi =◦ Di =
What kind of equation/relationship/graph is this?
Acceleration
If your car can accelerate at 5 m/s2, how long will it take the car to accelerate from 10 m/s to 25 m/s?
Bellringer
Bellringer Graphing Assignment Acceleration WS 2 pushed back to Thursday
(for this class only)
Agenda
Draw a position time graph of the following:◦ 1. An object travelling at a constant velocity◦ 2. An object that is not moving (start it at a
position other than zero so we can see the line)◦ 3. An object travelling that changes its velocity.
Make sure to label your axes!
Bellringer
Bellringer
Average Velocity WS corrections [10 min]
Reading Guide 3.1-3.2 [10 min]
Finish Acceleration ws 2
Agenda
Collect Acceleration WS 2 Lab: Speed Freaks 2.0
◦ Go to the FOOTBALL FIELD!
Essential Questions:◦ What does acceleration look and feel like?◦ How do we calculate speed and acceleration?
Agenda 9/21
Introduce ‘g’ ◦ -9.8 m/s^2
Hang Time Lab◦ Finish by tomorrow first thing!
Essential Questions:◦ Does gravity pull things down at a constant
velocity or accelerated? At what rate?◦ How does gravity affect how I jump?
9/25 Agenda
Collect Ch 2.2 Reading Guide Learn Breaking Distance Equation Problem Reading Trainer Accelerated Problem Poster Project
◦ Buy a poster this weekend. In fact, buy 5 posters.◦ Show Examples
Project: Make a parachute for an Egg◦ Make it out of anything.
Paper / plastic bags, newspaper String, tape, glue, staples Empty cartons for basket
◦ Project Rubric Next Week
9/26 Agenda
This equation is used when time is not involved (not given or asked for)
Vf^2 = Vi^2 + 2 * a * d Notice: no time! ______ is about to crash into _______. Their
velocity is ________. If the cars are ______m apart, what acceleration do they need to have to avoid a crash?
Braking Distance
What are our Equations?
CHAPTER 2 CHAPTER 3
Velocity = disp. / time◦ Vavg = Dd / Dt
◦ Constant Velocity means no acceleration.. Use this forumla!
Standard unit for velocity is m/s
A = Vf – Vi / t
Df = ½a*t2 + Vi*t + di◦ Shortcut: t = sqrt(2*d/a)◦ Only to be used when
falling and Vi = 0. Vf^2 = Vi^2 + 2 * a *
d
Acceleration due to gravity : g = -9.8 m/s2
◦ “fall, thrown, drop? Use g”
Collect Corrected Work ACT/PSAE Practice Distribute Problem Reading Trainer
Essential Questions: What are the common elements to solving a
physics problem?
9/29 Agenda
A ball rolls horizontally at 6 m/s. How long will it take the ball to cover 30 meters?
A ball rolls off of a table. It falls for 1 second before hitting the ground. How tall is the table?
Make a p-t graph of someone walking forward for 2 seconds, stopping for 2 sec, and backwards for 2 sec.
Extra credit: make a velocity-time graph of this too!
Bellringer 10/1
September 24
Bellringer Agenda
A football is thrown down field. It is caught at the same height that it was thrown. It is thrown at 20 m/s. How fast is it going when it is caught?
Write in 1-3 complete sentences HOW DO YOU KNOW?!?
Bellringer Interim Assessment
#1◦ Do not write on the test◦ You must bubble in
Name and ID◦ You MUST WRITE at the
top: “Hedden Period _” ◦ Pass back work
Go over the toughest assignment
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