Mechanical Energy in a parachute

In summary, the mechanical energy of the system (parachuter-parachute-Earth) is not a constant due to the presence of air resistance, which transforms kinetic energy into thermal energy.
  • #1
grizzlyjoker
11
0
Given an parachuter and the system parachuter-parachute-Earth and taking in account the resistance of the air, my question is: is the mechanical energy of the system (parachuter.parachute.Earth) a constant, please explain. And please don't talk just about the parachuter because I wan't to know about the parachuter and Earth as one system.
Thank you in advance.
 
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  • #2
What do you think?
 
  • #3
I think it isn't conserved because of the transformation of that energy in heat
 
  • #4
grizzlyjoker said:
I think it isn't conserved because of the transformation of that energy in heat
Good. You've answered your own question.

If the parachutist jumped in a vacuum, his kinetic energy would increase as the gravitational PE of the system decreased. Since there'd be no dissipative forces, the total mechanical energy would remain constant.

But with air drag present, much of his kinetic energy is transformed into random motion of the air--"thermal" energy. (The air gets stirred up, it and the parachute get warmer.) So the net mechanical energy of the system decreases.
 

1. What is mechanical energy in a parachute?

Mechanical energy in a parachute refers to the combined potential and kinetic energy that is used to slow down and safely land an object or person that is falling from a high altitude.

2. How does a parachute convert mechanical energy?

A parachute converts mechanical energy by utilizing air resistance, also known as drag, to slow down the descent of an object. As the parachute opens, it creates a larger surface area which increases air resistance and reduces the speed of the falling object.

3. What factors affect the amount of mechanical energy in a parachute?

The amount of mechanical energy in a parachute is affected by the weight and surface area of the object, the height from which it is dropped, and the density of the surrounding air. Heavier objects, higher drops, and denser air will result in more mechanical energy being used.

4. How does the shape of a parachute affect its mechanical energy?

The shape of a parachute plays a significant role in its mechanical energy. A parachute with a larger surface area will experience more air resistance, thus reducing the speed of the falling object and decreasing the amount of mechanical energy used for landing.

5. Are there any other factors that can affect the mechanical energy in a parachute?

Other factors that can affect the mechanical energy in a parachute include the material and design of the parachute, the altitude and wind conditions, and any external forces acting on the falling object. These factors can impact the performance and efficiency of the parachute in converting mechanical energy.

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