Welcome to Physics Motion

Warm Up Turn to Page 21 CLAIM EVIDENCE REASONING WHEN DONE: Write: CLAIM EVIDENCE REASONING 5 Minutes WHEN DONE: get out your planner and Walk the Graph

Agenda: summarize in planner Finish Identifying Relationships Ball Bearing Investigation

Learning Targets I can identify, describe and contrast different patterns of relationships between two variables

Writing and Reading Discussion Group Work Instruction Quiet Focused Active listening On Topic Ask Questions Group Work Focus on topic Fulfill Roles Lean in Instruction Listen Take notes Raise hands

Walk the Graph Let’s talk it out!

B fast walking A slow walking Turn to the person sitting next to you. Discuss the following question: Which graph—A or B—shows a person walking slowly? How do you know? Follow up: What kind of relationship or pattern produces a straight line graph? In this case, what two variables are in a linear relationship? What has to be true about the speed of the moving object?

away B A Turn to the person sitting next to you. Discuss the following question: Which graph—A or B—shows a person walking toward from the detector? How do you know? Follow up: What can you say about the distance covered by the walker during each walk? This example highlights two additional variables that are very important when talking about the motion of objects. What are they? toward

A B C position time position time position time Turn to the person sitting next to you. Discuss the following: Compare and contrast the motion of the person shown in graph A with graph B. Turn to the person sitting across from you. Discuss the following: Compare and contrast the motion of the person shown in graph B with graph C. What is the important variable here?

Evidence Based Conclusions Page 21 Have your Identifying Relationships out in front of you

Claim Evidence Reasoning A statement about the results of an investigation. Evidence The data, observations or models that support your claim. Write this down, on the page 21. Reasoning Why the data supports your claim. Connects claim to evidence.

Investigating Relationships Practice A You will need to select data points from the graph as evidence

Turn to Pages 22 and 23 Tape in Page 22: Ball Bearing Investigation Page 23: Data Table

Ball Bearing Investigation Make a prediction Identify Variables Complete Hypothesis Make a Visual Hypothesis 5 Minutes

Put tape marks on table here and here Set Up Put tape marks on table here and here Binder Ruler Box 40 cm 70 cm 100 cm 0 cm Tape here and here

How to run a trial Binder Ruler Box 0 cm 40 cm 70 cm 100 cm

How to run a trial Binder Ruler Box 0 cm 40 cm 70 cm 100 cm

How to run a trial Binder Ruler Box 0 cm 40 cm 70 cm 100 cm

Good trials Times must be within 0.1 seconds of each other! If not, repeat trial Example 1: 0.37 s and 0.54 s Difference: 0.17 seconds! Re-do Example 2: 0.37 s and 0.41 s Difference: 0.04 seconds! Keep!

Uncertainty= Range divided by 2 Range and Uncertainty Uncertainty: estimate of doubt in measurement Our estimate = the data range divided by 2 Range: The difference between the highest and lowest measurement Example: Highest: 0.95 s Lowest: .076 s Difference: 0.95-0.75=0.2s Distance Trial 1 Trial 2 Trial 3 Trial 4 70 cm 0.83s 0.95 s 0.75 s 0.88 s Uncertainty= Range divided by 2 0.2 s ÷ 2 = +/- 0.1 s

Hints Read instructions Look at example set up on front table Follow Roles Record times to TWO decimal places (don’t round!) example: 0. 56 s is 0.56 s, not 0.6 s Re-watch video if necessary

Ball Bearing Investigation DO: Set up ramp, meter stick, tape marks Decide on roles Collect data 20 Minutes WHEN DONE: calculate range and uncertainity

Clean Up Lab supplies put away Table supplies returned to box Name tags turned in Work turned in Notebooks in backpack Scrapes recycled Stay in your seat until the bell rings