Week 12.notebook
1
October 28, 2010
Nov 410:28 AM
Week 12
Mar 197:45 AM
Monday Warm UpWeek 12
Describe three things that are in motion in our classroom at this time.
Mar 197:45 AM
Pretest
No talking during pretest.Log in with lunch number.Answer all questions.
Mar 197:45 AM
Video: Take notes
Basics of Physics: Exploring the Laws of Motion
Complete worksheet as you watch and after the video is over.
Mar 197:45 AM
Wednesday Warm UpWeek 12
Why do you need to wear a seat belt in a moving car? Which of Newton's Laws applies to this?
Mar 197:45 AM
Cornell Notes: Motion
Motion: An object's change in position relative to a reference point.
Week 12.notebook
2
October 28, 2010
Mar 197:45 AM
Reference Points
Each person who catches the ball will state his or her position in relation to compass points (N, S, E, W)
Doors are south, back is east, front is west, wall of cabinets is north.
Mar 197:45 AM
More Reference Points
This time you will state your position in relation to the person who threw it. For example, the ball traveled south west (from front to table 1)
Mar 197:45 AM
What is speed?
Speed: the distance traveled divided by the time interval during which the motion occurred.
meters per second = m/s
Mar 197:45 AM
What is average speed?
Average speed = total distance ÷ total time
Mar 197:45 AM
Concept Check
What is your average speed if you take 0.5 hours to jog 4000 meters?
Mar 197:45 AM
Concept Check #2
If the average speed of a car is 110 km/h, how long will it take the car to travel 715 km?
Week 12.notebook
3
October 28, 2010
Mar 197:45 AM
What is velocity?
Velocity is the speed of an object in a particular direction.
20 m/s north is a velocity 20 m/s is a speed.
Mar 197:45 AM
How do you change velocity?
1. Change speed2. Change direction
Mar 197:45 AM
Can velocities be combined?
If you are on a bus moving 15 m/s east and you walk toward back at 1 m/s west, the resultant velocity is 14 m/s east.
Velocity in opposite direction subtract, Velocity in same direction, add.
Mar 197:45 AM
What is acceleration?
Acceleration is the rate at which velocity changes over time.
Acceleration could be change in speed OR direction.
Mar 197:45 AM
Is it acceleration?
You are riding your bike at 9 km/h. Ten minutes later, your speed is 6 km/h.
Mar 197:45 AM
Is it acceleration?
You ride your bike around the block at a constant speed of 11 km/h.
Week 12.notebook
4
October 28, 2010
Mar 197:45 AM
Is it acceleration?
You ride your bike in a straight line at a constant speed of 10 km/h.
Mar 197:45 AM
What if I slow down?
That is negative acceleration. Some people call it deceleration.
Mar 197:45 AM
How do I find average acceleration?
average acceleration = final velocity starting velocity time it takes to change velocity
Oct 289:49 AM
Oct 2810:18 AM Mar 197:45 AM
Assignment
Do page 123 #111
Week 12.notebook
5
October 28, 2010
Mar 197:45 AM
Thursday Warm UpWeek 12
Kira jogs to a store 72 m away in a time of 36 s. What is Kira's average speed?
Mar 197:45 AM
www. explorelearning.com
Time Distance gizmoComplete worksheet then take assessment.
Mar 197:45 AM
Friday Warm UpWeek 12
1. Draw a quick graph showing time vs. distance of a person walking 1 m/s for 5 seconds.
2. Draw a quick graph showing time vs. speed for the same person walking 1 m/s for 5 seconds.
Mar 197:45 AM
Title: Acceleration Lab
Question: What effect does an increase in masshave on the force needed to move an object?
Hypothesis:
Oct 2810:32 AM
Mass 1st timeNewtons
2nd time Newtons
3rd time Newtons
4th timeNewtons
5th timeNewtons
Avg. Newtons
0
1
2
3
Mass 1st max 2nd max 3rd max 4th max 5th max Avg. Max N
0
1
2
3
Mar 197:45 AM
Procedure:1. Find the mass of the cart2. Find the mass of the cart with 1, 2, and 3 fishing weights.3. Pull cart using spring scale at constant speed. 4. Record Newtons5. Repeat 5 times and find average.6. Add fishing weight and repeat #35 until you have average Newtons for 0, 1, 2, and 3 weights.
Week 12.notebook
6
October 28, 2010
Mar 197:45 AM
Analysis:
1. Was your hypothesis correct?2. Describe the relationship between the mass ofan object and the force (Newtons) it takes to move the object.3. Are there any points on your graph that do not appear to be in line with the other points? Explain what could have gone wrong.
Oct 2811:16 AM
Top Related