Roller skating is traveling on surfaces with roller skates. It is a recreational activity, a sport, and a form of transportation. Roller rinks and skate parks are built for roller skating, though it also takes place on streets, sidewalks, and bike paths.
Roller skating originated in the performing arts in the 18th century. It gained widespread popularity starting in the 1880s. Roller skating was very popular in United States from the 1930s to 1950s, then again in the 1970s when it was associated with disco music and roller discos. During the 1990s, inline outdoor roller skating became popular. Roller skating has often been a part of Black and LGBT history in particular.
Sport roller skating includes speed skating, roller hockey, roller derby, figure skating and aggressive quad skate. It is also widespread as a hobby.
hello, I'm trying to study for the mcat, and I have a conceptual question about normal force, mg, and centripetal force during a loop-de-loop on a roller coaster.
Could you validate these force equations?
1. At the very bottom of the loop:
N - mg = ma = mv^2 / r
N = mg + ma
2. At the...
Homework Statement
A 900 kg roller-coaster car is initially at the top of a rise, at point A. It then moves 165 ft, at an angle of 40.0° below the horizontal, to a lower point B.
Choose the car at point B to be the zero configuration for gravitational potential energy of the roller...
Homework Statement
Show that on a roller coaster with a circular vertical loop, the difference in your apparent weight at the top of the circular loop and the bottom of the loop is 6 g's--that is six times your weight. Ignore friction. Show also that as long as your speed is above the minimum...
Homework Statement
A 350kg roller coaster starts from rest at point A and slides down the frictionless loop-the-loop shown in the accompanying figure.
http://session.masteringphysics.com/problemAsset/1027487/5/1027487.jpg
1. How fast is this roller coaster moving at point B?
2. How hard...
Homework Statement
http://img57.imageshack.us/my.php?image=fullscreencapture322009.jpg
Part of the track of an amusement park roller coaster is shaped as shown below. A safety bar is oriented length-wise along the top of each car. In one roller coaster car, a small 0.10 kilogram ball is...
Homework Statement
The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 60m diameter loop-the-loop.
Homework Equations
What is the car's speed at the top?
The Attempt at a Solution
hello, this problem doesn't give much...
Homework Statement
The diagram below shows a roller coaster ride which contains a circular loop of radius r. A car of mass m begins at rest from point A and moves down the frictionless track from A to B where it then enters the vertical loop (also frictionless), traveling once around the...
Homework Statement
I have to make something that will roll down an incline as slow as possible. It needs to have a uniform radius of 0-.5m and have a mass between .25kg and .5kg. The ramp it needs to go down is a pine board 12' long, with a starting height of 6", and the ramp is 7.5" wide. I...
Homework Statement
We did this roller coaster lab where we had a metal marble roll up and down this roller coaster track.
One of the questions he asked us was "is energy "missing?" explain where it went."
I know friction takes some of it, but I am not good at wording it right to sound...
my friend thought of an interesting idea and i was just wondering if it would be worth the money to do it, or if it seems practical.
the problem with roller hockey is that the puck, even with wheels on it, doesn't slide too well. its pretty difficult to handle the puck on wood and its 10x easier...
I am using a gear mechanism in one of the toys that i am making for my baby. but the gear makes a lot of noise. Will replacing it with Roller drive or friction drive reduce the noise?
Is there any other way to reduce noise from gear drive?
Homework Statement
A roller coasters weight increases 50% through the center of a dip in the track. The radius of the dip is 30m. What is the speed at the bottom?
Homework Equations
This is a uniform circular motion problem correct? But how do I calculate if I don't know the weight...
Homework Statement
I have a physics question that deals with power. In this problem it is of a roller coaster moving from 7m above ground to a point that is 90m above the ground.
1. What is the power needed for a roller coaster that needs to move 127m and is moving at a velocity of...
Homework Statement
1. A roller coaster car of mass 1500kg starts a distance H=23m above the bottom of a loop 15m in diameter. If friction is negligible, the downward force the rails on the car when it is upside down at the top of the loop is:
a. 4.6*10^4 N
b.3.1*10^4 N
c.1.7*10^4 N
d...
Homework Statement
A roller coaster car has a mass of 800kg. It is released from the top of the hill A and moves without friction down the track. Determine the minimum exit velocity vD at ground level so that the car travels around both the circular loops (Loop B - Radius= 10m, Loop C -...
Homework Statement
A roller coaster car starts from rest and rolls down a frictionless track, reaching Vf ( final speed) at the bottom.
if you want the car to go two times as fast at the bottom by what fator must you increase the height of the track
Homework Equations
KE=1/2mv^2...
Homework Statement
A roller coaster begins with a steep downhill descent followed by a vertical loop. How much higher does the initial hill have to be to than the height of the loop so that the riders experience a force of 1G keeping them in their seats at the top of the loop? Assume that...
Homework Statement
A roller coaster at the Six Flags Great America amusement park in Gurnee, Illinois, incorporates some clever design technology and some basic physics. Each vertical loop, instead of being circular, is shaped like a teardrop. The cars ride on the inside of the loop at the...
You have been hired to design a spring-launched roller coaster that will carry two passengers per car. The car goes up a 12--high hill, then descends 20 to the track's lowest point. You've determined that the spring can be compressed a maximum of 2.3 and that a loaded car will have a maximum...
Homework Statement
A 250kg roller coaster passes a point A(located at the top of a hill of height 18.0m) at 12.0 m/s.
What is the speed of the roller coaster at point B located at the bottom of the hill if 8500J of energy is transformed to heat during the journey?
Homework Equations...
Homework Statement
Suppose the roller coaster in the figure (h1 = 35 m, h2 = 13 m, h3 = 20) passes point A with a speed of 2.70 m/s. If the average force of friction is equal to one sixth of its weight, with what speed will it reach point B? The distance traveled is 35.0 m...
800 kg roller coaster is initially at the top of a rise, at point A. It then moves 125 ft (38.1 m), at an angle of 40.0° below the horizontal, to a lower point, B.
(a) Choose point B to be the zero level for gravitational potential energy. Find the potential energy of the roller coaster-Earth...
Homework Statement
As a roller coaster car crosses on the top of a 10 m radius hill (the track is underneath the car), its apparent weight is one-half its true weight. What is the car's speed at the top?
Homework Equations
A=v^2/r
F=ma
The Attempt at a Solution
I tried...
Roller Coaster problem!
Homework Statement
A roller coaster at Six Flags Great America amusement park in Gurnee, Illinois, incorporates some clever design technology and some basic physics. Each vertical loop, instead of being circular, is shaped like a teardrop. The cars ride on the inside of...
1. What horizontal force F will pull the 100 kg lawn roller over the step? What is the value of F if it is directed normal to AC?
I can't draw a picture for you, but i can describe it. There is a circular lawn roller in contact with a step that is 3cm in height. The roller is currently...
Homework Statement
A 1000 kg roller coaser train is intially at the top of a rise, at point A. It then moves 135 ft, at an angle of 40 degrees below the horizontal, to a lower point B.
Choose the train at point B to be the zero configuration for gravitational potential energy. Find the...
Homework Statement
A car in a roller coaster moves along a track that consists of a sequence of ups and downs. Let the x-axis be parallel to the ground and the positive y-axis point upward. In the time interval from t=0 to t=4 s, the trajectory of the car along a certain section of the...
Homework Statement
The Following text is taken from a roller coaster webpage:
"You reach the top of the hill, and finally realize that being in the front seat wasn't the best idea. You find yourself hanging over the ledge for what seems eternity, and finally you feel the foce of the back...
Hey,
It's been about a year since I took mechanics, and I had agreed to help a friend out today. She gave me this problem, and I'm drawing a blank at how to approach it. No solution necessary, just an approach!
Homework Statement
A thin, uniform ring of mass m and radius R is attached by a...
Any help you can give me on the following question?
(a) A heavy industrial mill roller gets loose and rolls down a slope without slipping or sliding. It drops in height 900 mm. it is made of steel and is a hollow cylinder of outer diameter 600 mm, inner diameter 400 mm and length 1.2 m...
Im trying to figure when you have a rollercoaster or train, how are the forces different at the top of tracks compared to the bottom of the tracks.
How does this relate to setting up F=MA...and the Normal Force.
I know at the top you would have a feeling of weightlessness and at the...
Homework Statement
Derive a formula to calculate the height of the top of a hill on a roller coaster using triangulation. Final answer should be in terms of d, angle 1, and angle 2. There are two points on the ground. Angle 1 is the angle formed between the ground and a line that goes...
Homework Statement
A roller-coaster car has a mass of 1200 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 17 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward...
I got all the other centripetal force questions but this one has me stumped...
As a roller coaster car crosses the top of a 30m-diameter loop-the-loop, its apparent weight is the same as its true weight. What is the car's speed at the top?
The formula I used for all of the other questions...
Homework Statement
so I am a 8th grader and i got a homework asignment to draw free body diagrams of a roller coaster on inclines, straight aways and bottom of the hill. we didnt learn about physics yet so here's the question
- draw and label free body diagrams for the coaster car on...
[SOLVED] Work and Energy
Hello, I'm a little new to this forum but I would really appreciate some help with this particular problem.
A roller coaster reaches the top of the steepest hill with a speed of 5.8 km/h. It then descends the hill, which is at an average angle of 25 degrees and is...
Homework Statement
problem should be solved somewhat with energy conservation.
A car in an amusement park ride rolls without friction around the track shown in the figure . It starts from rest at point A at a height h above the bottom of the loop. Treat the car as a particle.
What is the...
Homework Statement
The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 37 m diameter loop-the-loop.
What is the car's speed at the top?
Homework Equations
n-mg=0
I don't know what equation to use
The Attempt at a Solution
I...
I have to make a roller coaster for a physics project and the dimensions of the project can be no larger than the mase of 1 meter by .8 m and 1.5 m tall. A golf ball is the object that must travel on the track and it must go through a loop and go off a 10 cm jump and travel for 20 seconds. My...
Homework Statement A car in a roller coaster moves along a track that consists of a sequence of ups and downs. Let the x-axis be parallel to the ground and the positive y-axis point upward. In the time interval from t=0 to t=4 s, the trajectory of the car along a certain section of the track is...
I have an assignment in my high school physics class to create a roller coaster that has at least one loop and a number of turns and drops. I have been searching the web to find a way to calculate if my car i made of K-Nex weighing 3oz, 85.04g, will have enough speed to clear a loop. The drop...
Roller Coaster Design Project...HELP!
okay so here we go. I'll give everything I have haha. & if anyone can help me out at all it would be greatly appreciated. I'm very much LOST!
BTW! I'm not asking anyone to do the project for me, don't get the wrong idea. I did attempt it, I got a little...
Homework Statement
Consider the frictionless roller coaster shown. (Diagram attached)
If a 12000 kg car starts at rest from Point A, calculate:
a) the total energy of the system
b) the speed of the car at point B
c) the force that must be applied to bring it to a stop at point E
d) the work...
Suzie (of mass 52kg) is roller blading down the sidewalk going 36 mph. She notices a group of workers down the walkway who have unexpectedly blocked her path, and she makes a quick stop in 1.9 seconds. What is Suzies average acceleration? Answer in m/s^2. What force was exerted to stop Suzie...
Homework Statement
O.k, i'll do my best to explain the problem as I but a picture would probabley be helpful. Basically there's an object of mass m travlleing down an incline. Near the end of the incline it does a loop. The question asks to calculate the normal force(Fn) as a function of ө for...
*****Making A Small Roller Coaster - A couple of questions (please answer ASAP)*****
Hi
I am going to make a small roller coaster and I had a couple of questions about it.
1) What materials are the best in making different parts of a roller coaster model? (The tracks, Loops, Base and ...)...
Question
In the design of a roller coaster, is it possible for any hill of the ride to
be higher than the first one? If it is not possible, give the reason. If it is
possible, how is it done?
Attempts
It is possible. Says we make the second hills higher than the first one, we can achieve...
Homework Statement
A roller-coaster car has a mass of 509 kg when fully loaded with passengers.
-The radius of the circle is 15m. (See picture below)
What is the maximum speed the vehicle can have at point B and still remain on the track?
_________m/s
Homework Equations
Sum of...