Physics 2015: Newton’s Law in Action Newton’s Law in Action.
Newton’s Second Law: Rear End Collisions. Learning Objective Apply Newton’s 1 st and 2 nd Law...
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Transcript of Newton’s Second Law: Rear End Collisions. Learning Objective Apply Newton’s 1 st and 2 nd Law...
ACTIVE PHYSICS 3.4
Newton’s Second Law: Rear End Collisions
NOVEMBER 29, 2010HOMEWORK: 3.4 PTG, P 299 #1-7 DUE TUESDAY
Learning Objective Apply Newton’s 1st and 2nd
Law to automobile crashes
Process Skill: Rewrite/Follow step-by-step procedures
Success Criteria Describe the causes of
whiplash Provide examples of
Newton’s 1st and 2nd Laws in automobile crashes
Analyze safety devices in preventing whiplash
Do Now Copy LO and SC on
new left side page! WDYS/WDYT p 292
Agenda Do Now: Lab with more clay
crash dummies! Summary
Rewrite procedures in your own words. Be sure to leave spaces to record data
and observations OK with Law before going into lab
REAR-END COLLISIONS
Materials NeededRamp2 Crash cartsManila FolderRing standClay passengersSeat papersScissorsMeter StickMasses
EXIT TICKET
What type of seat causes less whiplash? Explain why in terms of Newton’s 1st and 2nd Law.
NOVEMBER 30, 2010HW: NONE
Learning Objective Apply Newton’s 1st and 2nd
Law to automobile crashes
Process Skill: Rewrite/Follow step-by-step procedures
Success Criteria Describe the causes of
whiplash Provide examples of
Newton’s 1st and 2nd Laws in automobile crashes
Analyze safety devices in preventing whiplash
Do Now: Why is it important to
align the headrest appropriately to the height of the driver?
Agenda Do Now Physics Talk Summary
Honors Presentations
Libby
PHYSICS TALK 3.4
What is Newton’s Second Law?
If a body is acted on by an unbalanced force, it will accelerate in the direction of the unbalanced force.
The acceleration will be larger for smaller masses.
The acceleration can be an increase in speed, decrease in speed, of change in direction.
F=ma
REAR-END COLLISION
What is whiplash?
Why does it hurt?
A serious injury often caused by a rear-end collision.
The back of the seat, pushes the torso forward, leaving the head behind. This strains the neck and damages the alignment in the spine. The neck then snaps forward. Ouch!
Act out
NEWTON’S SECOND LAW
Important note about Newton’s second law
All accelerations are caused by unbalanced, outside forces
It does not say that all forces cause acceleration, only unbalanced ones.
How does Newton’s Second law apply to holding a book?
The force of your hand and the force of gravity are opposite forces acting on the same object, so the forces cancel out = no net force
How does Newton’s Second Law apply to a car traveling at a constant speed?
Since there is no acceleration, there is no net force. This means the forces are balanced.
The forces of the engine on the tires and road moving the car forward must be equal and opposite of the air pushing back on the car
ESSENTIAL QUESTIONS:
Pg. 298 Answer all questions in complete
sentences
EXIT TICKET
How does Newton’s Second Law apply to rear-end collisions and whiplash?