Presentation on theme: "Amusement Park Physics"— Presentation transcript:
1Amusement Park Physics Hold on to your hats, guys and gals, this is one fast trip!
2What makes a roller coaster so fun? Some think it is the free fallOthers the speed and accelerationMaybe it’s the fear you feelwhen the roller coasterSloooowly climbs that first hill!
3Roller Coasters What keeps you in Inertia your seat on a loop? What force powersRoller coasters?GravityWhy do you experiencecrushing feelings?InertiaWhere?At the bottom of a hill as thetrain starts to go upWhy do you experience free fall?InertiaAt the top of a hill as thetrain starts to go downWhere?
4Energy Mechanical Energy 1. Potential Energy 2. Kinetic Energy Thermal Energy1. Friction
5Looping Coaster at Canobie PE = mghWhy is this hill lower?How can we calculate the energy lost to friction?KE = ½ mv2
6Spiral Twists Why have these loops? Acceleration = change in velocity over timeVelocity = speed and direction
7Water Rides—are they roller coasters? CompareBoth have hillsBoth use gravityBoth have energy transformationsContrastWater powers the ride—not gravity aloneWater is also the friction to slow down—not brakesNo trackPE to KE transformation not as key as water speed
8The Boston Tea PartyThe friction with the water and the blunt shape of the car makes the wave so huge and beautiful!Teacher’s petI love physics
9Circular Rides—A huge variety This type of ride makes many peopleFeel ill. How?
10What do the forces look like on a swing ride? And in a circular pattern withconstantly changing directionDirection of the rideRiders move out from the centerThis is different from a ride with a track,because there no track/seat to push back.What is the reaction force then?
11But they all work the same way What other force is at work here?Hint: it pulls you downIf you are going on the ride with Hagrid (a giant),should you or he sit on the outside?Hint: Which way are you being pulled or pushed?
12Let’s Look at the Forces Centripetal forceCDirection of rideThe direction is constantly changing which meansThe acceleration is constantHow does inertia figure into this?
13Is this one different? Do you really need the restraints? If someone were to say, upchuck, what directionWould the substance go?Eww—GROSS!!!
17Pirate Ship—Pendulum Rides FREE FALLWhat is the thrill of this ride?What produces that thrill?Inertia
18Free Body Diagram Inertia keeps the body going up When the ship is going back downThe force of friction goes againstThe direction of motionDirection of movementForce of Weight
19How Could We Calculate the Amount of Energy “Lost” Due to Friction? Where we release the “ship”PE = mghWhere the highest point isafter an amount of timePE = mghIf we find both PEs and subtract h – h. . .we have it!Now, what if we want to find the averagePE lost on each swing?