First, a force of 2 to 5 pounds per ton of train weight is required to move on straight level track. At very slow yard speeds only 2 to 3 pounds is needed while increasing to about 5 pounds at higher speeds. This force is required to overcome bearing friction, rail deflection, minor flange contact, etc.
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How do you solve the train car problem in physics?
How much momentum does a freight train have?
Trains on average weigh between 8,000 to 10,000 tons and travel approximately 40 mph or 17.9 m/s. The average train would have a momentum between 143,200 ? 179,000 ton*m/s as it travels. Stopping an object smoothly and safely with such a magnitude would require a distance of at least a mile.
How efficient is train freight?
In fact, trains can haul one ton of goods an average of more than 480 miles on just a single gallon of fuel, making them 3-4 times more fuel efficient than trucks. Freight rail is the most fuel-efficient way to transport freight over land, and railroads continue to invest in technology to reduce fuel consumption.
Can a fly stop a train physics?
No, because the collision only affect a tiny amount of the surface of the train. Depending on the relative mass and speed of the molecules of the fly and train, the initial molecular collisions could result in a net “backwards” movement of both.
How do you find the acceleration of a train?
Why do trains look slow?
Things appear to move slower when they are far away because they seem smaller, and take longer to cross our line of vision. Likewise, they appear to move faster when they are close by, because they seem bigger.
How much force can a train pull?
A modern railcar has a gross capacity of 286,000 lbs or 125.5 tons moving in trains consisting of 100 cars or more, yielding a total carrying capacity of 12,500 tons, an increase of over 181% in carrying capacity. Power of Locomotives Light duty โ low horsepower vs.
How many containers can a train pull?
Three-pack and five-pack well cars The containers can be double-stacked, which means up to 10 containers can be carried on one railcar. Containers on well cars can be 20, 40 or 53 feet in length.
What is the momentum of the train?
As a result, the train’s linear momentum is calculated as P=ฯ2Mv.
What is loco momentum?
Locomotive Momentum is a decoder feature which attempts to replicate the mass of a real train, for more realistic operation compared to toy trains. Real trains do not start and stop suddenly. Acceleration and deceleration will occur over a period of time, independent of how fast the throttle is opened or closed.
Which has more momentum a car traveling at 20 m/s or a train stopped at the train station explain your answer?
The car has more momentum because it has a greater mass. The velocity of an object also affects the amount of momentum an object has.
How much CO2 does a freight train produce per mile?
Emissions comparison Rail transportation emits about 0.2 pounds of greenhouse gases per passenger mile (55 g/km) when each car is filled with 50 passengers. This figure increases to about 0.5 pounds per passenger mile (140 g/km) when only filled with half that amount.
How long do train engines last?
Diesel engines continuously run 1,000,000 to 1,500,000 miles before major overhaul. They are 3 major reasons why they last so long: Design. Fuel.
What makes trains so efficient?
Freight trains are several times more energy-efficient than trucks, because 1) the rolling resistance of the steel wheels of trains is lower than that of truck tires on the road, and 2) trains encounter less proportional wind resistance than trucks since a train car is partly shielded from the headwind by the car in …
Can a bee stop a train?
A bee traveling near the speed of light would not stop the train either. It would, however, both stop and reverse direction of many small pieces of the train!
What happens to a fly on a train?
@Yan – if the air is moving with the train, the fly will get dragged with it due to air resistance.
Can trains fly?
What is the formula to calculate acceleration?
Acceleration (a) is the change in velocity (ฮv) over the change in time (ฮt), represented by the equation a = ฮv/ฮt.
Why does the acceleration of a train decrease?
The train’s velocity increases as it accelerates at the beginning of the journey. It remains the same in the middle of the journey (where there is no acceleration). It decreases as the train decelerates at the end of the journey.
What is the speed of a train?
High-speed trains can generally reach 300โ350 km/h (190โ220 mph). On mixed-use HSR lines, passenger train service can attain peak speeds of 200โ250 km/h (120โ160 mph).
Can trains run in the rain?
Trains are able to run in the rain and snow.
Why can’t trains stop immediately?
Because of their size, weight and speed, trains do not stop quickly, even under emergency conditions. From the time the brake is applied to the time that the train stops, it may cover more than a mile of track. This means that even well-trained workers may have no way to avoid an accident.
Why does one side of a train go faster than the other?
“It’s the combined effect of looking through a window at a greater distance than the other one; and the parallax effect, meaning the wall is probably closer to the train on that side. Makes all the difference,” said another user.
How does a freight train pull so much weight?
The pulling frictional force of loco becomes thus more than the total bogies weight times rolling friction. This makes loco to pull the bogies without slip. Also when the loco starts it gives a jerk while pulling, this contributes to rolling contact friction.