Oct. 16, 2012

Oct. 16, 2012AGENDA:1 – Bell Ringer2 – Acceleration

Classwork

Today’s Goal:Students will be able to understand acceleration conceptually & be able to calculate itHomework1. Acceleration HW (p 8 –

11) –Due tomorrow

CHAMPS for Bell RingerC – Conversation – No Talking H – Help – RAISE HAND for questionsA – Activity – Solve Bell Ringer on

binder paper. Homework out on desk

M – Materials and Movement – Pen/Pencil, Notebook or Paper

P – Participation – Be in assigned seats, work silently

S – Success – Get a stamp! I will collect!

Tuesday, Oct. 16th (p. 21)Objective: Students will be able to understand acceleration conceptually & be able to calculate it

Bell Ringer:1. When you slow down is that

acceleration?2. Describe 2 situations from

your life where you are accelerating.

4 MINUTES REMAINING…

1minute Remaining…

30 Seconds Remaining…

BELL-RINGER TIME IS

UP!

Shout OutsPeriod 5 – Nana JenkinsPeriod 7 – Shawn Osbey, Paul Webster

Oct. 16, 2012AGENDA:1 – Bell Ringer2 – Acceleration

Classwork

Today’s Goal:Students will be able to understand acceleration conceptually & be able to calculate itHomework1. Acceleration HW (p 8 –

11) –Due tomorrow

Week 6Weekly AgendaMonday – AccelerationTuesday – AccelerationWednesday – Results Section of

LabsThursday – Acceleration LabFriday – Quiz # 3

CHAMPS for Acceleration Problems

C – Conversation – No Talking unless directed to work in groups

H – Help – RAISE HAND for questionsA – Activity – Solve Problems on Page

4-7M – Materials and Movement –

Pen/Pencil, Packet Pages 4-7P – Participation – Complete Page 3-4S – Success – Understand all

Problems

interval timentdisplaceme = velocity average

tdv

_

Acceleration

Classwork for Tuesday, 10/16/12 (p. 4)

1) Define: Velocity: Acceleration:

Equation: Equations: =

If you have a constant velocity...your acceleration is __________________


1) Define: Velocity: Change in displacement Acceleration: Change in velocity over over time. time

Equation: v = Δd/Δt Equations: a = Δv/Δt = change in

If you have a constant velocity...your acceleration is zero

Classwork for Tuesday, 10/16/12 (p. 4)2) Determine whether the object in the story is accelerating and whether the velocity is increasing decreasing or neither. a) A ball is dropped off a bridge Accelerating? Yes No Velocity? Increase / Decrease / Neither b) A man is running at a constant speed Accelerating? Yes No Velocity? Increase / Decrease / Neither c) A car slams on the brakes to miss hitting a deer. Accelerating? Yes No Velocity? Increase / Decrease / Neither d) After the starting gun fires a running starts running Accelerating? Yes No Velocity? Increase / Decrease / Neither e) A car is traveling at a constant 45 meters second. Accelerating? Yes No Velocity? Increase / Decrease / Neither f) A ball slows as it rolls up hill. Accelerating? Yes No Velocity? Increase / Decrease / Neither

Challenge!!!!! Can you figure out the sign of each acceleration? (+ or -)


2) Determine whether the object in the story is accelerating and whether the velocity is increasing decreasing or neither. a) A ball is dropped off a bridge Accelerating? Yes No Velocity? Increase / Decrease / Neither b) A man is running at a constant speed Accelerating? Yes No Velocity? Increase / Decrease / Neither c) A car slams on the brakes to miss hitting a deer. Accelerating? Yes No Velocity? Increase / Decrease / Neither d) After the starting gun fires a running starts running Accelerating? Yes No Velocity? Increase / Decrease / Neither e) A car is traveling at a constant 45 meters second. Accelerating? Yes No Velocity? Increase / Decrease / Neither f) A ball slows as it rolls up hill. Accelerating? Yes No Velocity? Increase / Decrease / Neither

Challenge!!!!! Can you figure out the sign of each acceleration? (+ or -)


3) When you drop a ball from your hand, it starts out with no velocity. It accelerates downward at 9.8 m/s^2, gaining speed as it goes. What is accelerating this object?


3) When you drop a ball from your hand, it starts out with no velocity. It accelerates downward at 9.8 m/s^2, gaining speed as it goes. What is accelerating this object? Gravity


4) Light travels at a constant speed of 300,000,000 m/s. What is light’s acceleration?


5. A car traveled 1025 kilometers from El Paso to Dallas in 13.5 hours. What was its average velocity?

GIVEN WORK

ANSWER


5. A car traveled 1025 kilometers from El Paso to Dallas in 13.5 hours. What was its average velocity?

GIVEN WORK

ΔD = 1025 KM ΔT = 13.5 HRS V = ?

V = ΔD/ ΔT = 1025/13.5 = 75.9 KM / HR

ANSWER: 75.9 KM / HR


6. A car traveling north with a velocity of 30 m/s slows down to a velocity of 10 m/s within 10 seconds. What is the car’s acceleration?

GIVEN WORK

ANSWER


6. A car traveling north with a velocity of 30 m/s slows down to a velocity of 10 m/s within 10 seconds. What is the car’s acceleration?

GIVEN WORK

VI = 30 M/S VF = 10 M/S ΔT = 10 S A = ?

A = (VF – VI)/ΔT = (10 – 30 M/S)/10S = -2 M/S2

ANSWER: -2 M/S2


7. If the average velocity of a car is 45 km/hr, how far can it travel in 40 min? GIVEN WORK

ANSWER


7. If the average velocity of a car is 45 km/hr, how far can it travel in 40 min? GIVEN WORK

V = 45 KM/HR TIME = 40 MINS = .67 HOURS

V = ΔD/ΔT ΔD = VΔT ΔD = (45 KM/HR)(.67) = 30 KM

ANSWER: 30 KM


8. Falling objects drop with an average acceleration of 9.8 m/s2. If an object falls from a tall building, how long will it take before it reaches a velocity of 49 m/s?

GIVEN WORK


8. Falling objects drop with an average acceleration of 9.8 m/s2. If an object falls from a tall building, how long will it take before it reaches a velocity of 49 m/s?

GIVEN WORK

A = 9.8 M/S2

VF = 49 M/S VI = 0 M/S ΔT = ?

A = (VF – VI)/ΔT ΔT = (VF – VI)/A = (49 M/S – 0 M/S)/(9.8 M/S2) = 5 S


11. If I were to accelerate at this rate for another ninety seconds, how fast would I be going?

12. If I were to drop a ball out of my car while I was traveling at a velocity of 25 m/s,

and it underwent a deceleration of 2.0 m/s/s while rolling to a stop, how long would it take for it to stop?

13. How far would it roll in this time?


14. Use the following graph to answer the following questions about the acceleration of Bob the Pickup:

a. What is the acceleration of Bob the Pickup in the first 10 minutes that the graph shows us?

b. What is the acceleration of Bob the Pickup during t=20 to t=30?

0500

10001500200025003000

0 10 20 30 40 50 60

Velo

city

(fee

t/min

ute)

Time (minutes)

Velocity of Bob the Pickup



a = (1000-0 ft/min)/(10 min) = 100 ft/min2

b. What is the acceleration of Bob the Pickup during t=20 to t=30? a =(1500 – 1000 ft/min)/(30-20 min) = 50 ft/min2

0500

10001500200025003000

0 10 20 30 40 50 60

Velo

city

(fee

t/min

ute)

Time (minutes)

Velocity of Bob the Pickup



a = (1000-0 ft/min)/(10 min) = 100 ft/min2

b. What is the acceleration of Bob the Pickup during t=20 to t=30? a =(1500 – 1000 ft/min)/(30-20 min) = 50 ft/min2

c. When is there no acceleration?

d. When is Bob slowing down? What is his acceleration then?

e. What is Bob’s average acceleration between t=40 minutes and t=60 minutes?

f. What is Bob’s average acceleration between t=10 and t=60?


Homework 4: Acceleration (due Wednesday, 10/17/12)

DIRECTIONS: Solve the following situation problems using equations for velocity and acceleration.

1. What is the velocity of a rocket that travels 9000 meters in 12.12 seconds?

2. What is the velocity of a jet plane that travels 528 meters in 4 seconds?

3. After an impact involving a non-functioning satellite, a paint chip leaves the surface of the satellite at a velocity of 96 m/s. After 17 seconds, how far has the chip landed?

Oct. 16, 2012

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