# Jaimes mishap with the bus Newton law lab. Essential Question How do we describe what happens in a collision in terms of Newtons Laws of Motion.

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Jaimes mishap with the bus Newton law lab

Essential Question How do we describe what happens in a collision in terms of Newtons Laws of Motion

Hand out Jaimes Mishap with Bus Yellow pamphlet Name Class Period Read, answer the questions on page 14

Read story Describe what was happening with the bus and the car before the crash Why did the crash occur?

Question 1 (pg 14) Describe (using words or pictures) what forces acted on Jaimes body during the collision?

P14 in yellow book Describe the forces pushing/pulling on Jaimes during collision. Draw a free-body diagram

Free Body Diagram of Jaime Upward force of seat Weight Friction and seat belt Forward force of seat

P14 Why is she having x-rays and an EKG What is the use of an X-ray? What is the use of an EKG?

EKG? electrocardiograph (ECG or EKG) Detects changes with the heart rate Primarily used to determine if the Heart has been damaged

X-rays, EKG tests X-rays See if there is any internal damage to bones MRI – see if there is any damage to soft tissues EKG See if there is any thing wrong with the heart, or circulation

Use of X-rays

Use of EKG Echocardiograms

MRI Magnetic Resonance Imagery

What are the factors that determine how fast a car comes to a stop?

Some Factors that determine rate at which a car stops Road conditions Tire condition Brake Conditions Weather How distracted the driver is How tired the driver is If the driver is under the influence

What of the previous factors are influenced by the driver?

Driver influenced conditions Condition of the car Condition of the driver Rate at which the car moves

How close should you to another vehicle on the road?

How far apart should vehicles be driving down the road?

The rules The 2 second rule The 1 car length for every 10 mph rule

Crash Simulation #1 Make a prediction: What do you think will happen to the clay passenger in the car when the bus crashes into its rear bumper. Specifically Predict the motion of the head, torso, hands and feet the instant after impact

Procedure Form Groups Each group will need to make the person in the car and the heads of the people on the bus Perform experiment as indicated Make observations Answer questions in book on pg 15-16

Car Crash Lab Each person is responsible for completion of pages 15-22 Write the predictions BEFORE Do and record the observations Then Answer any questions in book

Warning Any horseplay or making of inappropriate anatomical parts for the clay figures will result in you spending the rest of the time in room 240 today and a zero for the missing pages of work

Group Selection 3-5 people per group My choice

Materials that need to be acquired by each group Ramp Wooden Car Clay Scissors 3-4 straws 4-6 world history textbooks (by back window) Ribbon (pick up from teacher when needed Same on the floor for ramp, start ramp from a seat

Run Make observations on head, neck, body, (hands and feet)

Make sense of your observations: What parts of the body were at rest before the collision? Did these parts of the body try to stay at rest after the collision? Explain your answer

How does 1 st law of motion connect to what you saw?

Questions #3 and 4 #3 Although you observed the bus striking the car, where did the actual push acting on clay passenger come from? #4 What is the common name used for neck injuries sustained in a rear end collision

Part B, Passengers on the Bus Predict what will happen to the heads and necks of the passengers on the bus the instant after impact?

Does 1 st law explain your observations?

Sim II Who needs a seatbelt? Use 1 st law to predict what would happen to the passenger when his car crashes into a fixed barrier w/o seatbelt? What part of the car causes the most deaths in a head on collision w/o seatbelts?

Making sense What is the force that pulled the car and passenger down ramp? Describe motion of passenger: Acc, CV

Making Sense #3 A) what was force that caused motion of car to abruptly change? Balanced or unbalanced forces on car at time of accident?

Making Sense #3 B) Describe resulting motion of car when it struck barrier: Acc, CV C) Explain motion of passenger using 1 st law

If Fluffy the Kitty was sleeping (without a seatbelt) in the rear window well … Describe Fluffys motion if the car was involved in a head-on collision?

Crash Sim III Seat belts types Pre Lab discussion

Investigating the effect of seatbelt width

Can seat belts be too wide? Too narrow? Pressure (force per area) is important concern

Other features of seatbelts Why not make seat belts out of metal? Why not make seat belts out of leather?

Can seat belts be too wide? Too narrow? Pressure (force per area) is important concern

Other features of seatbelts Why not make seat belts out of metal? Why not make seat belts out of leather?

Use 1 st law of motion to explain the benefits of using a shoulder harness

Page 21 Create a free body diagram of each car to answer questions 1 and 2 Predict the relative amount of force of the car and bus

Pg 21 What do you think happened to the students on the bus? Injuries? Types? Motion of students at time of impact?

Bottom of page 21 Compare the cars force on the bus to the force the bus applies to the car Are they the same size? Are they applied in the same direction? Are they applied at the same time?

Pg 22 Situation #1 How does force that one student exerts on the other compare? Situation #2 How does force of car on tree compare to force of tree on car? Situation #3 How does the forces exerted by the bus and car on each other compare?

Pg 22 Situation #1 2 students (one larger, taller than other) Neither is moving How does force that one student exerts on the other compare? Draw free-body diagrams on each

Pg 22 Situation #2 Wooden car crashing into a barrier and comes to a stop How does force of car on tree compare to force of tree on car? Draw free body diagrams of each.

Pg 22 Objects in motion School bus crashes into Jaimes car How does the forces exerted by the bus and car on each other compare? Draw free body diagrams of each

Comparison of action-reaction forces in different situations Make predictions for each situations on page 23-25

Comparing forces in contact Two people leaning against each other Neither is moving How do the forces each exerts on the other compare?

Sit #2 Fast moving object crashing into stationary object What are the action and reaction forces? How do they compare?

Objects in motion What are the action and reaction forces? How do they compare?

Compare forces between objects Pg 23-25 For each situation: F 1 = the force that person 1 applies to person 2 F 2 = the force that person 2 applies to person 1

P27 Write the third law in the scroll Answer the question below the scroll

P29 On the moon, the acceleration due to gravity is 1.7m/s 2 Complete part 1 and part 2 Inertia is measured by mass

P30 Finding the weight of an object Weight = ___________ x ___________

Weight = mass X acceleration due to gravity Complete part IV on page 30

Homework in Yellow Book Page 35-37 problems 3-8

Thursday Go over 29, 30, 35-37 Finish the yellow book Seat-belts debate Seat-belt assignment Grades and hand-back tests ?

To answer questions Circle the relationship you think is true Answer #4 on pg 24 Answer #3 and #4 on pg 25

Newtons Third Law For every action force, there is an equal reaction force applies in the opposite direction

Third law Every force is matched with a equal sized reaction force Action and reaction force are NOT applied to the same object Action and reaction force are applied at the same time

Scale Demo Push your scale gently against the other scale (no more than 60) Have one person hold firm and the other person do the pushing Have both people moving while pushing

Who was injured more severely, the kids on the bus or Jamie? Why?

Reason Both bus and car exerted the same force on each other Amount of force changes the motion of the car much more, due to the difference in mass

The Mass of the object That is why the bus is less effected by the crash than the car…it has more mass! NOT because there was less force applied to it

Who needs seatbelts? Safety features of cars Safety features of buses

Fill out page 45 in yellow book

Sum up How do the forces exerted on the car and bus from the collision compare? How does the mass of the car compare to the mass of the bus? Which object (Bus, Car) will accelerate more because of the applied force from the accident? How can the motion of the students on the bus be related to the 1 st and 3 rd law? Knowing about action-reaction forces, why was there more damage done to the car?

Seat Belts Did Jaimes seatbelt help or harm her? Would seatbelts have helped or harmed the students on the bus for this accident? Are there other types of accidents with school buses that would have changed your answer in the above question?

The Seatbelt issue Read pg 46-51 (includes some articles on the issue of seat-belts on buses Answer the first 3 questions on page 46 Use the internet to see if any district or states requires school buses to have seatbelts– get specifics Determine if other buses are required to have seatbelts (greyhound…)

Seatbelt Position Paper Decide for yourself whether there should be a law that mandates that all school buses have seatbelts for each student. One-two pages Typewritten, (handwritten will lose points) Provide some evidence for both sides of the argument. Indicate the source of the evidence in the paper Use the laws of Newton correctly to back up evidence Bring up other issues (Security, cost…) in addition to help argue your position Grammar, Paragraph structure will count as well as strength of argument, evidence

Rubric Seat belt paper (50 points) Friday Up to nine points each for: –At least 3 worthwhile reasons for seatbelts –At least 3 worthwhile reasons against belts –Connection between each law to seatbelts Up to six points each for: –Clear statement of position on seatbelts –How well the project written –Condition of project Up to 4 points for: –references from outside articles or other sources

Can you think of Bus accidents where seat belts would be useful?

Do you believe that school buses should have seatbelts? Reasons for mandatory seatbelts Reasons against seatbelts

Ideas For seatbeltsAgainst seatbelts

Safety on school bus report Read pg 46 and the 3 articles on the following pages. Seek out at least one other source of information that will help you answer the first 3 questions on page 46. Write a position paper on whether schools should be forces to put seatbelts on all buses

Report should: Be typed 1-2 pages Cite at least 4 sources Indicate your position in the opening paragraph Include at least 3 reasons for seatbelts Include at least 3 reasons against seatbelts A final paragraph that indicates the reason(s) that determined your choice, be persuasive Bibliography Use the laws of motion in explanation of reasons

Discussion

How does speed relate to force?

Does it matter the size of the vehicles that crash together?

Do you need seatbelts on a bus? Write a paper listing at least 3 reasons for having seat belts and 3 reasons for not having seat belts. Connect all of Newtons laws to support your reasons Determine your answer to the above questions Turn in to me on Tuesday of next week

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