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Why is it dangerous to stand on the edge of a platform near the rail when the train is passing by?
When a train enters a platform, a region of low pressure is created around the train and if a person stands on the edge , he might gets pulled towards the train, so it is dangerous to stand near the edge.
Why is a suction effect experienced by a person standing close to the platform at a station when a fast train passes?
The work-energy theorem says that the work done by the resultant force acting on a system is equal to the change in kinetic energy of the system. Any moving liquid has three kinds of energies: Kinetic energy by virtue of its motion.
Why is it dangerous for a person to stand near a fast moving train?
A person is standing near a fast moving train will tend to fall towards it because of Bernoulli’s principle. The molecules of air between the person and the train is high due to the dragging effect. So, the air behind the person pushes them towards the train and hence he falls towards the train.
Why passengers are advised to stand behind the yellow line?
People are advised to say behind yellow lines for the safety of the passengers. Explanation: When train reaches the platform because of its high speed it may exert force such that passengers may be dragged on to the track.
Why do you have to stand behind the yellow line?
Stay behind the yellow line to keep yourself and others safe. Standing in front of the yellow line could block the driver’s view of traffic and distract the driver.
Why is a suction effect?
Suction is one of the methods of boundary layer control, which have the aim of reducing drag on bodies in an external flow or of reducing losses of energy in channels. This method was suggested by L. Prandtl in 1904 as one of the means of preventing or “delaying” boundary layer separation.
What is suction effect?
n. 1 the act or process of sucking. 2 the force or condition produced by a pressure difference, as the force holding a suction cap onto a surface. 3 the act or process of producing such a force or condition.
What does a train pull?
Trains are typically pulled or pushed by locomotives (often known simply as “engines”), though some are self-propelled, such as multiple units. Passengers and cargo are carried in railroad cars, also known as wagons. Trains are designed to a certain gauge, or distance between rails.
Why is there a yellow line at train stations?
One result has been the familiar yellow warning lines painted along station platforms. Usually positioned 1500mm from the platform edge, these lines are mandatory if trains pass at more than 100 mph, or freight trains at more than 60 mph. Her idea was to shield her daughter from the dust generated by passing trains.