Roller Coaster

Topics: Potential energy, Energy, Force, Introductory physics, Classical mechanics / Pages: 2 (288 words) / Published: Jul 11th, 2013
The Roller Coaster Question a)
E1=E2
Eg+Ek= Eg1+Ek1 mgh+1/2mv2= mgh1+1/2mv21
(1250)(9.8)(10)+1/2(1250)(v)2=(1250)(9.8)(65)+1/2(1250)(2.5)2
v= 32.9 m/s
Therefore you need 200003.9 watts of power to raise the cars to the top of the 1st hill with the speed of 32.9 m/s
Therefore you need 200003.9 watts of power to raise the cars to the top of the 1st hill with the speed of 32.9 m/s
Energy= 800156 J

P= E/T = 800156J/40s = 200003.9 W

b)
E1-Wf =E2
The expected speed of the cars is 8.5 m/s. Friction did 608000 J of work on the cars from the top of the hill to the braking zone.
The expected speed of the cars is 8.5 m/s. Friction did 608000 J of work on the cars from the top of the hill to the braking zone.
Eg+Ek-Wf= Eg1+Ek1 mgh+1/2mv2-Wf= mgh1+1/2mv21
Wf= mgh+1/2mv2- mgh1-1/2mv21 = (9.8)(65)+1/2(2.5)2-(9.8)(12)-1/2(8.5)2 = 608000 J

c)
Wf=Ff x d
The average Frictional Force was 844.4 N.
The average Frictional Force was 844.4 N.
Ff = Wf/d =608000J/720m = 844.4 N

Assumptions

* Acceleration of gravity is 9.8 m/s2 * Moving in direction of Force ( cos=0) * Sitting in middle cart. * Start 10 m off the ground “loading area” * Air resistance isn’t a huge factor

Physics

* The roller coaster is always moving (Kinetic Energy) * Gravitational Potential Energy is constant * Friction of Roller

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