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.
In principle, the ring is, at any instant, a beam being loaded in the centre, and in a failing state.
Thus, to drive the material continuously through the rollers, Force x Velocity = Work done/time = power.
60.P/2.pi.N = T
The units pan out, but is the concept correct?
The faster the work is...
A torque meter with a triangular slab extension is inserted into a corresponding triangular slot. The C-shaped arm features a V-shaped dent on which a roller is seated. This roller is held in compression by a spring. The roller's positions are labeled '0' for the initial state and '1' for the...
Hello there,
I'm trying to select a tapered roller bearing (TRB) for my actuator, I know the peak axial force that is going to come. I have some radial load as well.
I want to select the TRB based on the axial load, but all the bearing catalogs or most of them give Dynamic and static Load...
Hi
I'm analyzing a tapered roller bearing as part of a differential. I know the shaft is providing input torque of 333.5 N-m @ 4000RPM, and I know the bore size of the bearing, 30mm. I need to find the radial and axial forces given that torque, so I can move on to finding C10, L10, rated load...
See attached image.
The solution to this problem calculates v2 at the top of the roller coaster ride. Why is that? Shouldn't you calculate v2 at the bottom of the roller coaster ride as you require the maximum velocity there to get around the loop?
Two weeks ago, my carry on worked perfectly. But last week the detachable wheels stopped rotating smoothly, when I tried to glide my carry on. The wheels budge JUST A TAD when you push them hard, but it should be EFFORT LESS! Please see two pictures below.
I see nothing jammed in the wheels. I...
For this question i tried to reason with my self that C was the fastest and A was the second fastest. B would be the third fastest and D would be the least fastest since the ball has to go up. I looked up the answer and it says that C is the fastest , B and D are equal, and A is the slowest. How...
height from ground
speed
100
40
80
48
60
60
40
72
20
80
I tried to plot the points (speed on x-axis and height on y axis) and I got more or less like a straight line but I am not sure whether the graph would help to calculate the upper and lower limit of the time.
I also tried to...
Hello. Can someone tell me what area of phisics should I study to better understand this exercise( I ve been looking at kinematics since it asks for the velocity but I can't seem to find where it talks about different points like this) and also what should I do to solve this exercise please?
A...
height to point A is 65m. no friction. comes to rest at point A. total mass of the roller coaster is 650 kg.
the work-energy theorem states that the net work done on an object is equal to the change in kinetic energy of the object. kinetic energy is E=1/2mv^2. initial velocity is...
Summary:: I am doing my structural analysis homework and I can't seem to identify between pin joint and roller.
Please take a look at the following exercises and help me understand:
1) In exercise 6.87, the joint at C is a pin joint whereas in exercise 5.63 the joints at the casters are...
I have a machine I am designing that has a carriage supported by Track rollers on a machined flatbar track.
The load that each individual roller will experience could reach 2000lbs. worst case scenario.
The track surface is machined 304L - 1" wide as you can see in the green in the attached...
Why I think gravity *is* the only force doing work on the rider:
1) The only forces acting on the rider are gravity and the normal force. Broken down into their component vectors, we have:
-> The component of the force of gravity moving parallel to the rider's direction of motion
-> The normal...
So, we know that at the bottom of the loop, the car will have a normal force pointing upward and gravity pointing down. However, I have discovered that the normal force is apparently greater than the force due to gravity.
Basically
N = F(g) + ?
What is this other force?
Suppose there are 6 cars on a roller coaster and I synchronize 6 clocks at rest with respect to each other in a box with no wiggle room on the space station. The bottom of the box has the same shape as the curvature of the earth, and the box is always kept "top side up" with respect to the...
So, while we were going up the track, the z-direction gforce seemed to go up. It went from -1 to about -0.6. The x-direction seemed to be around 0, more or less? All x values were under 0.177. The y-direction decreased, more or less, from -0.4 to -0.9.
I think if I understand how the force...
I am working on a 500 kg roller, which I want to pull using electric motor. I am considering hub motor, since it is easier to frame a basic ev with it. Now I need to know the capacity of the hub motor, I need to choose.
Roller weight = 500 kg
Frame weight + driver weight = 150 kg
speed required...
Homework Statement
This isn't really a homework but a project I'm doing that's due soon. In our multivariable calculus class, we're creating a 3D roller coaster, and I need to explain the physics behind the roller coasters.
For a roller coaster loop, if it were perfectly circular, we would...
Homework Statement :[/B]
A child of mass 40.0 kg is in a roller coaster car that travels in a loop of radius 7.30 m. At point A the speed of the car is 15.0 m/s, and at point B, the speed is 15.6 m/s. Assume the child is not holding on and does not wear a seat belt.
What is the force (in N) of...
i am making a plate straightining maching for 25x2100 mm plate.
motor- 30 hp and 960 rpm
worm reduction gear box- 100:1
Please tell me about the selection of roller by which i can straight the plate, and gear also.. if center distance between gear is 280 mm
Greetings Sir, I have a motorized RTS roller shutter (which can be controlled by both hand held remote controller Or wall switch) . The thing is when the motor detects an object, it will put its entire weight on the object and then stop (which means it will suffocate that "object"). Hence we can...
Homework Statement
A roller coaster reaches the top of the steepest hill with a speed of 7.0 km/h. It then descends the hill, which is at an average angle of 43° below horizontal and is 46.0 m long. What will its speed be when it reaches the bottom? Assume the coefficient of kinetic Friction...
Homework Statement
Assume the roller coaster cart rolls along the curved track from point A to point C under the influence of gravity. Assume the friction between the cart and track is negligible. What would be the direction of the carts acceleration at point A? (The question in the image does...
i need to select the motor for a roller of Diameter 300mm , length 1350mm having inertia 3.95 KG.M ,Which needs to accelerate from 0 to 600MPM at 20 sec . Assuming existing web tension acting on the roller 20 N/M.
THANK YOU
Homework Statement
m1= 0,05 kg, m2= 0,03 kg, mass of spring is omitted. We look at movement after spring stopped vibrate. How long does the spring measure during the movement if not stretched spring measure 0,1 meter and if we use force 0,1N elongation measures 0,02 meter.
(sorry, English isn't...
1. The problem statement, all variables, and given/known data
I was just wondering if a roller coaster can still pass through a loop with less than critical velocity/energy (Also if I'm assuming critical energy correctly). The loop can be of any size yet it must not exceed 5.7g at the entry...
Homework Statement
If it can be assumed that the car has the same speed at points A and E, which of the following statements is true?
a. The net work done in this system is 0
b. The net work done in this system is positive
c. The net work done in this system is negative
d. The net work done in...
Hello!
We were recently introduced to mathematical modeling.
I would want to model a blood roller pump - a simple peristaltic pump. I was wondering, what kind of formulas there are that I can use to model a pump which optimizes the number of rollers, roller diameter, tube diameter etc...
Homework Statement
A gardener pulls a roller of mass 85 kg over a step. The roller has a radius of 0.25 m. The handle is attached to an axle through the centre of the roller at an angle of 45 degrees to the horizontal.
Here's a link to the diagram below, it's figure 1 and 2 on question 18...
Homework Statement
Jessie (m=56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m high roller coaster loop.
a) Assuming negligible losses of energy due to friction and air resistance, determine Jessie's total mechanical energy at the bottom of the loop (h=0 m). (ans: 1.53 x 104...
Homework Statement
Based on the height of a first hill (114.5m), mathematically determine the minimum height (circular motion and radius) of the next hill based on the speed generated on the first hill.
At the bottom of the first hill, the velocity of the roller coaster is 47.38m/s. There is...
Homework Statement
For my high school physics class we made roller coasters out of card stock with various loops and funnels. We then had multiple questions to answer. I couldn't seem to figure this one out.
Why does the power have to be found at the bottom of the loop? Explain in terms of...
I have to make a roller coaster for a golf ball. It has to be made out of recycled materials. This also means no materials for construction (but chicken wire is allowed) and no prefabricated materials (Legos, Kenex, etc)
2 loops, 2 hills. Each hill has to be 20 cm height change.
Can anyone...
Would someone withe a bachelors in civil engineering and a masters in structural engineering have a good chance at getting a job designing water rides, roller coasters, and theme parks?
Homework Statement
A roller coaster at the nearby amusement park Physics Hill, has a large circular loop where cars travel at the top of the loop at 25.0 m/s causing the riders to enjoy an acceleration of 3g. Assuming the height of this loop is the same as the diameter, how high is the loop...
Hi.
I have issue of continuous failure of Track roller because of excess loading.
I am looking for bush bearing with bearing pressure with 150 to 200 MPa @ 0.144 m/sec sliding speed & Friction coefficient shall be max 0.1.
I will install a sleeve on the bush bearing & use it as a roller .
Can...
Homework Statement
in the notes , why did the author only stated that zero displacement occur at pin and roller support?
Why the author didnt stated that the slope at pin and roller support is also = 0 ?
Homework EquationsThe Attempt at a Solution
As we can see from the figure, the gradient...
What major would you study for a job like that, I'm hoping for someone to say structural/ civil/ architectural engineering because that's what I'm looking into but I've heard that its more mechanical or electrical engineering.
Homework Statement
A rollercoaster has a loop with a radius of 12m. The coaster travels 50m and at point A, enters the loop. The average frictional force on the coaster is 40N. The mass of passenger is 50kg. What is the minimum kinetic energy required at point A to generate a velocity of 27m/s...
Hi, if I have a block of metal with a quarter circle curve cut out of it, and a metal roller of matching radius that contacts this curved piece, what are some ways I could go about measuring the friction between these two surfaces? The roller is fixed and the block is pushed into it with a...
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 top...
I am trying to understand how the photons in the LIGO beams behave when going along the "slopes" of the gravitational waves, in particular how the Shapiro delay gets factored into the resulting interference.
To simplify the situation, suppose that a LIGO photon starts orthogonally to a wave...
Hi, I have been studying up on circular motion in the vertical plane and I am happy with all the math/theory that I have read explaining the normal force and weight force and the feeling of being "heavier" and "lighter". My question is about the top of the hill/ride, The forces acting on you at...
Homework Statement
A roller coaster is going down on a track (see image below, the track itself is highlighted in red) without initial velocity. What is the coefficient of friction between the roller coaster and the track?
height at which the cart starts (h) = 12m
weight of the car (m) = 620kg...
Homework Statement
[/B]
b) Calculate the maximum velocity of the empty carriage at D. (3 marks)
Homework Equations
/[/B]
The Attempt at a Solution
750 x 9.8 = 7350 N
No clue. Can't use SUVAT on the vertical plane to find time because v = u = 0 from peak/trough to peak/trough. Horizontal...
From my research and understanding of roller coasters, their speed is mainly impacted by the force of gravity and it works on the basis of potential energy build up into kinetic energy. Therefore, my question surrounds the idea of safe speeds on coasters. Because a roller coaster car is only...