Fizix Is PhunFizix Is PhunLab Day @ Great Lab Day @ Great EscapeEscape

Fizix Is PhunFizix Is PhunLab Day @ Great Lab Day @ Great EscapeEscape

Hints and Other Useful TriviaHints and Other Useful Trivia

General Protocols• Must be in homeroom on time• We leave at __________

– no call-down

• Gates open at 10:00• Mandatory Check-In @ Lunch

– 12:00 to 1:00– Check-In at __________

• Bus leaves at _________

Pre Prior Planning…• Protractor Elevation Device

– Make it– Practice with it

• For each page– What data must be collected– How can it be collected– Who will collect it

• Where possible– answer theory questions– prepare equations

Suggestions, etc.• Pre Prior Planning…• Gather all data first, then do

calculations– I'm at the check-in for questions

• Pack will be collected when the bus arrives back at the school

• Lunch, Lockers• Items Due in class on _______

• pre-assignment• signed permission slip

Boomerang 1• “Should” implies friction free

– Consider KE PE conversions

• “Is” means in reality– time the car’s length passing the

final point or

– vf from v=d/t formula

• Friction (Ff) causes lost acceleration

F

F

ma

mg

a

gf

N

lost lo st

Boomerang 2• free body diagram forces

– weight– force due to motion (circular)

• minimum speed causes vertical forces to be in balance at top of loop

Canyon Blaster• be sure to use the central loop• estimate distance via

– distance between supports– # supports in circle

• use vertical poles as reference

Canyon Blaster

Comet 1• use protractor as a protractor• classical calculations

– v=d/t– PE=mgh– Work Energy Theorem– W=Fd

Comet 2• Think KE PE• "Should" means friction free• "Is" means actual• velocity: time how long it

takes for the train to move its own length

Comet 3• heed the assumption about

lost energy• knowing KE yields v

• FC and g-forces

Comet 4• watch carefully• time train moving its own

length before the brakes are applied

• time how long the brakes are used

Steamin' Demon 1• use protractor as a protractor• classical calculations

– v=d/t– PE=mgh– Work Energy Theorem– W=Fd

• Note: Demon1 or Comet1, not both

Steamin' Demon 2• “Should” implies friction free

– Consider KE PE conversions

• “Is” means in reality– time the car’s length passing the final

point

– vf from v=d/t formula

• Friction (Ff) causes lost acceleration

• Note: Demon2 or Boomerang1

Steamin' Demon 3• free body diagram forces

– weight– force due to motion (circular)

• minimum speed causes vertical forces to be in balance at top of loop

• Note: Demon3 or Boomerang2

Steamin' Demon 4• 2 rides required• greatest force

– in or out of seat– top of loop or bottom

• greatest "rush"

Flying Trapeze 1• Finding FC via balanced forces

• the chain doesn't change length– rest length becomes hypotenuse

• balance the forces– FT in chain

– FC horizontal

– mg vertical

Flying Trapeze 2• Finding FC via circular

• the chain doesn't change length– rest length becomes hypotenuse

• find circumference / radius• find period of revolution

High Divers 1• Comparing Processes

– KE PE energy conversions– classical (timed) free-fall

• know R%E formula

High Divers 2• Must do High Divers 1• classic acceleration• grand scale approximation w/

unit conversion

The Merry-Go-Round• radius

– via circumference – distance from outer edge

• FC calculations

• Ride twice for comparison• Work & Power

Pirate Ship• just a big pendulum• meaning of "weightless"• μ similar to Boomerang1

Water Tube Rides• need only do 1 of 4

• vf is the same for similar vertical drops regardless of path

• for #5, I suggest v=d/t• μ similar to Boomerang1

Wave Pool• try to visualize a stop action picture• watch from one side, use partner as

a marker• grand scale approximation

– pool is not rectangular– length between depths by pacing sides– width by pacing thru water– volume of a trapezoid solid