Search Results Archives: September 2011
1. Return and go over quiz 4 (page 28 in your notes)
2. Do problems 17-19 on page 26 and 47,48,50 on page 27 in the book. (page 29 in your notes)
3. Homework: Read pages 22-25 in your book and answer questions 22-25 on page 26. (page 30 in your notes)
Do all three activities (#51,52, and 53) on page 27. You may work in groups. You need to compare your results to everyone else in your group.
For #53, use the method on page 22.
Put all three activities in your notes.
What may become one of the greatest discoveries in our time, as well as the most revolutionary to physics as we know it, was announced last week. The ultimate speed limit, the speed of light has been found to not be a limit at all.
Some Videos: Speedy particles,
For all the questions below, write the questions and answers in your notes. This should be page 26 and called “Faster Than Light!”
Read About The discovery here.
Answer the following questions:
1. What does Einstein’s theory of relativity say about the speed limit for objects in the universe?
2. What is the speed of light in meters per second?
3. What things would be possible if faster than light travel was possible?
4. Where was the faster than light discovery made?
5. What particles were found to travel faster than light?
6.Find out three things about the particle in #5 and list them. (google search it if you have to)
7. How much faster than light did the particles go?
8. What is CERN? Describe it.
9. Something you use very often, and are using right now, was invented at CERN. Can you find out what it is?
10. What is the LHC? Describe it.
11. Find a picture from the air of LHC, and a picture of a particle collision in the LHC. Sketch them and describe them in your notes.
1. Pass back quiz 3 (page 23)
2. Acceleration, How Far? notes. (Page 24)
3. Do problems13-16 and 20,21,22 on page 662. Finish any problems you don’t get to as homework. (page 25, acceleration, how far?)
Today you will visit some websites and study acceleration. Please put all answers and drawings in your notebook. This should be page 22.
Go to this page about acceleration.
1. Set the objects to be whatever objects you want, keep acceleration at zero, and click the RUN button. Draw one of the trucks and the arrows showing how position changes in your notes (use dots instead of arrows if you want). Write down the first bullet point (where it says “An object with a zero acceleration always move at the same speed.”) about accelerations under this drawing. Explain in your own words how you know from the dots that speed does not change.
2. Go back to the first page and give both objects a positive acceleration of 10 m/s^2. Draw one of the trucks and the arrows. Put the second acceeleration bullet point under this one and explain how the dots show the speed is increasing.
3. Go back to the first page and give each object a negative one acceleration (-1 m/s^2). Run the simulation, draw one of the objects and the marks it makes, and put the third bullet point under your drawing. Explain how the dots show what happened.
4. Give the objects any acceleration. Run the simulation. Draw one of the objects and it’s markers. Write down the fourth bullet point under your drawing.
5. Make the fifth bullet point happen, draw it, and write it down.
Go Here and run the free fall simulation.
Start the ball at six different heights and find the time it takes for the ball to fall. Make a chart of these numbers in your notes and graph them in OpenOffice.
Find the final velocity of the ball for five different heights and graph velocity on the y-axis and time on the x-axis.
Draw these graphs in your notes. You don’t have to draw a perfect graph, just get the general shape of the graphs in your notes and label your axes.
Change the acceleration of gravity to simulate the moon’s gravity. How does the freefall time change on the moon as well as the final velocity? Put this in your notes.
Today you will finish the gravity lab.
1. Use the equation for g that I post on the board to calculate g for each drop height from yesterday.
2. Put =2*B2/(A2*A2) into C2 and drag the black square down to calculate g for each of the heights.
3. Write a Lab report, include the measurements, the graph, and your calculations for g. For the results, discuss how close you came to the actual value of 9.8 m/s^2. Discuss why you are as far off as you are, or why you are so close if you are close.
4. Name your lab “your name your partners names gravity lab” and put it in the gravity lab folder.
1. Using stopwatches and yardsticks, measure the time it takes for a golfball to drop at 4 different heights. For all heights, measure the time at least five times and average the result. Throw out results that are far away from others and try again until your results are similar.
2. The fifth height will be from the bridge between science and the main building.
3. Enter your averaged data into a table in OpenOffice.
4. Graph the data as a distance vs. time graph with time on the x-axis and distance on the y-axis
Save your project so we can work on it tomorrow.
Need book today
Page 20: Motion Practice Problems
Do questions 1-12 on page 661 in your book. Write all questions and show your work!
1. Go over homework
2. Negative Acceleration notes
3. Problems:
1. Write a chart for the speed vs. time of a car traveling at 50 m/s that slams on the brakes and decelerates at -10 m/s^2 until coming to a stop.
2. Draw the path of a cannonball shot straight up with a speed of 30 m/s. Label the time and speed of the ball at each second.
3. How long did it take for the cannonball reach its highest height?
4. How long was the cannonball in the air?
1. Table of Contents and collect homework
1. Return and go over last quiz. Remember you can re-take after school on Tues/Thurs.
2. Acceleration Lecture and notes
3. Free Fall, How Fast?
Homework: Do problems 26 – 31 on page 26