How to calculate heat released from friction

In summary, calculating the heat released during space shuttle re-entry can be estimated by taking the difference in mechanical energy before and after re-entry, but determining the exact rate of heat generation requires complex simulations and experimental data. However, calculating the total heat generation for the entire re-entry is relatively simple by considering kinetic energy.
  • #1
EasterEggs123
11
1
If I wanted to calculate, say, the heat released during space shuttle re-entry, how should I do it? I know they provide the heat on their website, but if I wanted to arrive at the result just through calculation, would that be easy?
 
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  • #2
You can get an estimate for the maximum amount of energy converted to heat in the shuttle and atmosphere during reentry by taking the difference in the amount of mechanical energy (kinetic energy due to the speed of the shuttles relative to the atmosphere or ground plus potential energy from being at a certain height in the Earth's gravity field) the shuttle has just before reentry compared to the mechanical energy at some other point of interest, for instance when it stops at the runway.
 
  • #3
To calculate the rate of heat generation at any particular point in time during re-entry is a very difficult problem . Complex computer simulations and data from many years of experimental work are needed .

However working out the total heat generation for the complete re-entry from first entering the atmosphere to touch down is relatively simple . Can you see how this could be done ?

Think about Kinetic Energy .
 

1. What is heat released from friction?

Heat released from friction is the energy that is generated when two surfaces rub against each other, resulting in the conversion of kinetic energy into thermal energy.

2. How is heat released from friction calculated?

The amount of heat released from friction can be calculated using the following formula: Q = μNΔd, where Q is the heat released, μ is the coefficient of friction, N is the normal force, and Δd is the distance the object moves due to the frictional force.

3. What factors affect the amount of heat released from friction?

The amount of heat released from friction is affected by the coefficient of friction, the normal force, the speed of the rubbing surfaces, and the type of material the surfaces are made of. Additionally, the presence of lubricants and the duration of the frictional force can also impact the amount of heat released.

4. Can the heat released from friction be negative?

Yes, it is possible for the heat released from friction to be negative. This occurs when the frictional force causes a decrease in the object's kinetic energy, resulting in a decrease in temperature. An example of this is when a car's brakes are applied, converting the car's kinetic energy into thermal energy and causing the brakes to heat up.

5. How does the heat released from friction affect the surfaces involved?

The heat released from friction can cause an increase in temperature of the surfaces involved, potentially leading to wear and tear and damage over time. It can also affect the performance and efficiency of the objects, such as reducing the speed or increasing the energy required for movement.

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