1. During storm roof of house is blown off 2.It is dangerous to stand near the railway track when a train is moving with high speed

1. Why is the roof of a house blown off during a storm?

The roof of a house can get blown off during a storm due to strong winds and the pressure difference inside and outside the house. To understand why this happens, we need to consider the following factors:

- Wind speed: During a storm, the wind can reach high speeds. The faster the wind blows, the more pressure it exerts on the structures it encounters, including roofs.
- Pitched roof design: Many houses have pitched roofs with a sloping surface. This design can create uplift, where the wind passes over the roof, creating a low-pressure zone on top. The combination of external high-pressure wind and internal low-pressure air can lead to the roof being lifted or blown off entirely.
- Structural integrity: If a roof is not properly built or maintained, it may be more vulnerable to damage during a storm. Weak connections, deteriorated materials, or improper installation can increase the risk of the roof being blown off.

To mitigate the risk of your roof getting blown off during a storm, it is crucial to ensure proper construction and maintenance. This can include reinforcing roof connections, using durable materials, and regularly inspecting and repairing any weaknesses or damages.

2. Why is it dangerous to stand near the railway track when a train is moving at high speed?

It is dangerous to stand near railway tracks when a train is moving at high speed due to several reasons:

- High speed momentum: Trains are heavy and powerful vehicles that generate significant momentum, especially when traveling at high speeds. If a person is struck by a train, the force of impact can be catastrophic and potentially lethal.
- Lack of reaction time: Trains can travel much faster than humans can react. Even if a person notices an approaching train, it may be too late to move out of the way in time. Trains require a long distance to come to a stop, so your reaction time might not be sufficient to avoid a collision.
- Slippery tracks: Railway tracks are not designed to provide traction for pedestrians. Therefore, standing near the tracks can be dangerous, as you may slip or lose your balance and fall onto the tracks, putting yourself at risk of being hit by a passing train.
- Electrical hazards: Railway tracks often have overhead power lines or electrified third rails, which carry high-voltage electricity to power the trains. Standing too close to these electrified elements can result in electrocution.

To stay safe near railway tracks, always adhere to warnings, barriers, and signs that indicate the presence of trains or high-speed rail traffic. It is crucial to maintain a safe distance from the tracks, use designated crossings when necessary, and never attempt to cross or walk on the tracks when a train is approaching.