Monday, September 23, 2013

Physics

Warm UpFind the vi if vf=20m/s,

a=4 m/s2 and t=5s

Standards: 1a Students know how to solve problems that involve constant speed and average speed.

Learning Objective: SWBAT understand what they did wrong on the test and will be able to correct their work and prepare for retake.

Agenda: 1. Warm Up2. Correct Homework 3. Correct Quiz? If

necessary4. Review Test5. Start Redoing

Problems

Homework• Quiz Friday• Test Problems Redo• Test Retake option available

until Oct. 4th

Tuesday, September 24, 2013

Physics

1. Warm Up2. If a golf ball starts with a speed of

2.0 m/s and slows down at a constant rate of 0.50 m/s2 , what is

its velocity after 2.0 s? Standards: 1a Students know how to solve problems that involve constant speed and average speed.

Learning Objective: SWBAT collect data and create a graph that displays constant accelerated motion.

Agenda: 1. Warm Up2. Review Homework3. Introduce Lab4. Galileo’s Inclined

Plane

Homework• Finish Lab Graph and

Discussion Questions• Quiz Friday

Wednesday, September 25, 2013

Physics

Warm UpA ball on a ramp starts

from rest and speeds up to 20cm/s in 0.75s. What is

the acceleration? Standards: 1a Students know how to solve problems that involve constant speed and average speed.

Learning Objective: SWBAT apply constant acceleration equations to solve problemsAgenda: 1. Warm Up2. Review & Collect Lab

Sheets3. Constant Acceleration

Notes4. Constant Acceleration

Practice.

HomeworkQuiz FridayAcceleration Practice

Thursday, September 26, 2013

Physics

Warm Up

Standards: 1a Students know how to solve problems that involve constant speed and average speed.

Learning Objective: SWBAT employ the two constant acceleration equations to various situations. Agenda: 1. Warm Up2. Correct HW3. Practice Solving Constant

Acceleration Problems

HomeworkConstant Acceleration HWQuiz Friday

What is the final velocity of a train that accelerates at 4m/s2 for 10 seconds if it starts at 10m/s?

Friday, September 27, 2013

PhysicsWarm Up

How long did it take a dune buggy to travel 20 km to the sand dunes if it accelerated from rest at 20km/hr2?

Standards: 1a Students know how to solve problems that involve constant speed and average speed.

Learning Objective: SWBAT score at least 80% on Quiz 4Agenda: 1. Warm Up2. Review Homework3. Take Quiz4. Practice with eqns of

motion

HomeworkQuiz Retake Monday After SchoolLast week to do test retake after School: Last days=Monday&Wednesday

More on Accelerated MotionRight now we use and when we solve problems with accelerating objects.

Now we have some new equations. One will make solving some acceleration problems easier.

One will allow us to solve a bigger variety of problems

Conventions for Physics Diagrams

for drawing

distance

horizontal displacement

vertical displacement.

d

Δx

Δy

for drawing

speed

velocity

for drawing

mass

acceleration

time

5kg

a

Δx

t

vs

v

Compare and Contrast v vs t graphs and x vs t graphs

1.Does the slope of the velocity/time graph mean the same thing as the slope of the displacement/time graph?

4. Find the average acceleration of the object from t=12s to t=24s.

2. On graph 2, from t=20s-25s is the object represented by the graph moving? Is the object on graph 1 moving from 20s-25s3. Find the average acceleration of the velocity time graph from t=10s to t=20s

Symbols, units and equations Study Guide--distance(d), displacement (Δx) units: meters (m)--speed (vs),velocity (v) units: meters per second (m/s, or km/hr)--acceleration (a) units: meters per second squared (m/s2, km/hr2) --time (t or Δt) units: seconds

Equations:

In class practiceA car traveling at 46.0 m/s approaches the turnoff for a restaurant 30.0 m ahead. If the driver slams on the brakes with an acceleration of -6.40 m/s2, (A) how long will it take for the car to stop? Write down the Givens: 2 minutes• Draw the Diagram 3 minutes• Choose the equation 1 minute• Solve the problem 3 minutes.

Constant Acceleration Practice A

1. Which formula would you use to solve the following problems? Explain why. :

2. Solve problems a & b. 3. Find the uniform acceleration that causes a car’s velocity to

change from 32 m/s to 96 m/s in an 8.0s period. 4. A car with an initial velocity of 22 m/s is accelerated uniformly

at the rate of 1.6 m/s2 for 6.8s. What is its final velocity? 5. *A dragster starting from rest accelerates at 49m/s2. How fast

is it going when it has traveled 325m?

vf 0 m/s

vi 40 m/s

Δx not givena -3 m/s2

t ?

vf not given

vi 0

Δx ?a -3 m/s2

t 4.5s

a b

Constant Acceleration Practice B1. A car accelerates from rest at a rate of 2.0 m/s2

for 22 seconds. How far does the car travel while accelerating?

2. A car accelerates from rest at 1.0 m/s2 and covers a distance of 500.0 m. How long did it take?

3. A boat accelerates at 0.5 m/s2 until it reaches 35 m/s. If its initial velocity was 5.0 m/s, how long did it take?

4. A car covers a distance of 400.0 m in 20.0 s . What was the car’s acceleration?

5. What was a motorcycle’s acceleration that went from 0 to 40 m/s is 5.2 seconds?

•  

Acceleration Practice C:

Lets make our own word problems:

To create a word problem answer the following questions.

1. Which equation do you want this problem employ (use)? Ex.2. Which letter in the equation do you want to make your unknown. Ex. t=?3. You get to make up numbers for all other letters in the equation.

Ex. Δx=0.7m, a=4m/s2, 4. What object do you want to feature in your problem? Ex. baseball.5. Now construct a setting or a scene for the motion to happen in.

Ex. During a game a pitcher winds up and accelerates a baseball. If the pitcher accelerates the ball during his 0.6 meter long windup at 4m/s2, how long did the pitchers windup take?

6. Now you’re done. Solve it!. Write Your Givens. Draw Your Diagram.For Homework Make 2 Word problems and solve them. Make 1 for each equation.