# How do you solve train problems in physics?

## What is slack action on a train?

In railroading, slack action is the amount of free movement of one car before it transmits its motion to an adjoining coupled car.

## How does a train move physics?

The wheels on each side of a train car are connected with a metal rod called an axle. This axle keeps the two train wheels moving together, both turning at the same speed when the train is moving. This construction is great for straight tracks.

## What force causes a train to move?

Since gravity pulls a train downward and centrifugal force pulls it outward, a track banked at just the right angle can spread the forces more evenly between a train’s inner and outer wheels, and help to keep it on the track.

## What is the formula to find the length of the train?

Length of train = Length of platform / Difference in time x Time taken to cross the man. Or, Length of train = 175 meters.

## How do you solve the two trains math problem?

If both trains leave the station at the same time, how far apart will they be at the end of two hours? Train A traveled 120 miles, and train B traveled 140 miles. Because they’re traveling in the same direction, you subtract to find the distance between them: 140 – 120 = 20. The two trains are 20 miles apart.

## How much slack is in a train?

Assuming 6″ per car, there is about 50 feet of slack in a 100 car train, so that when starting, the locomotive could move about 50 feet (about one car length) before the rear end even started moving, assuming the slack was bunched…. A train’s slack condition is either “bunched”, or “stretched”.

## How much slack is in a train coupler?

The slack comes from the 1/2 inch or so space in the coupler, times a large number of cars. A hundred coal cars times 1/2 inch is like 5 feet of slack … So no need for springs you’ve got all the slack you can handle in the couplers.

## How much does a train stretch?

At any given time on Class Is’ networks, trains stretching from 10,000 to 15,000 feet long are snaking their way to a destination.

## Which type of motion is train moving?

Train moving on a track follows a straight line, hence it undergoes rectilinear motion.

## How many wheels are on a train?

Most trains will have eight wheels per car in total, so the number of wheels on the entire train will depend on the number of cars in the train itself. Trains are typically between 65 and 200 cars in length, meaning they might have anywhere from 520 to 1,600 wheels or more.

## Why do trains move back and forth?

“Depending on the length of the train, as well as the length and number of tracks at a rail yard or customer facility, the train may have to move back and forth as it shoves cars into one track, backs out, and then moves forward to drop off or pick up cars on an adjacent track.”

## How does friction affect a train?

This static frictional force, of the rails pushing forward on the wheels, is the only force that can accelerate the train, pull it uphill, or cancel out the force of air resistance while cruising at constant speed.

## How much weight 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.

## How much friction does a train have?

For steel on steel, the coefficient of friction can be as high as 0.78, under laboratory conditions, but typically on railways it is between 0.35 and 0.5, whilst under extreme conditions it can fall to as low as 0.05.

## What is the speed of a train?

High-speed trains can generally reach 300–350 km/h (190–220 mph). On mixed-use HSR lines, passenger train service can attain peak speeds of 200–250 km/h (120–160 mph).

## How can you determine the speed of a moving train?

1. Length of the train = 150m. Speed of the train = 90 km/hr. = 90 × 5/18 m/sec.
2. Length of the train = 340 m. Length of the tunnel = 160m. Therefore, length of the train + length of the tunnel = (340 + 160) m = 500m.
3. Speed of the train = 90 km/hr. Speed of the train = 90 × 5/18 m/sec = 25 m/sec.

## How do you find the length of a train when given distance and time?

1. GIVEN: Length of platform = Length of train × 2.
2. CONCEPT: The time taken to cross the platform is equal to sum of length of train and length of platform divided by speed of train.
3. FORMULA USED: Distance = Speed × Time.
4. CALCULATION: Speed of train = 144 km/hr = 144 × 5/18 = 40 m/sec.
5. ∴ The length of the platform is 800 m.

## How do you calculate the speed of two trains?

Suppose two trains are moving in opposite directions at u kmph and v kmph. Then, their relative speed = (u+v) kmph. If two trains of length x km and y km are moving in the opposite directions at u kmph and v kmph, then time taken by the trains to cross each other = (x+y)/(u+v) hours.

## How do you solve distance speed time word problems?

When solving these problems, use the relationship rate (speed or velocity) times time equals distance. For example, suppose a person were to travel 30 km/h for 4 h. To find the total distance, multiply rate times time or (30km/h)(4h) = 120 km.

## What does green check mean in Slack?

Often someone will make a request and another person will “claim it” by marking it with the eyes emoji to say “I’m going to take a look at this.” Once the question is answered and the task complete, that same person will mark it with a white/green checkmark to let members of the channel know it’s done.

## What does a check mean in Slack?

When Slack verifies an organization, a purple check mark will appear next to an organization’s name. You’ll see this check mark when you add someone from a verified organization to a channel in your Slack workspace, or when you accept an invite from someone at that organization, as seen below.

## What is the purpose of the checker in Slack?

Spellcheck in Slack is enabled by default, and will automatically detect the language of the messages you send. In the message field, misspelled words will appear underlined in red.

## Which type of coupling is used in railway?

Buffers and chain The basic type of coupling on railways following the British tradition is the buffer and chain coupling. A large chain of three links connects hooks on the adjoining wagons.