Newton's Third Law hot air balloon

In summary, the conversation discusses the four forces present in a physics student's ascent in a hot air balloon and which two of these forces create an "action-reaction" pair in accordance with Newton's third law. The correct answer is F2 and F3, as the Earth pulls downward on the student with a force equal to his weight, while the student pulls upward on the Earth with an equal force. The other choices do not accurately reflect the application of Newton's third law.
  • #1
Mitchtwitchita
190
0

Homework Statement



A physics student in a hot air balloon ascends vertically at a constant speed. Consider the following four forces. that arise in this question.
F1 = the weight of the hot air balloon
F2 = the weight of the student
F3 = the force of the student pulling on the earth
F4 = the force of the hot air balloon pulling on the student
Which two of these forces form an "action-reaction" pair that obeys Newton's third law?
a)F1 and F2
b)F2 and F3
c)F1 and F3
d)F2 and F4
e)F3 and F4

The Attempt at a Solution



I think it's d) because gravity is pulling the student downwards while the hot air balloon is exerting the same force in the opposite direction, keeping the student in the basket. Is this a correct assumption?
 
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  • #2
No, this is not the 3rd law. Look up its definition in regard to the 'action-reaction' pair. Essentially, if A exerts a force on B, then B exerts an equal but opposite force on A.
 
  • #3
Do you mean the question does not pertain to the third law or my answer?
 
  • #4
Mitchtwitchita said:
Do you mean the question does not pertain to the third law or my answer?
I meant your answer is incorrect because what you have described is an application of Newton's first law , with 2 forces acting on the same object and summing to zero. Newton's 3rd law applies to the force pairs acting on different objects. One of the multiple choices describes the correct application of Newton 3.
 
  • #5
So, would it then be b)?
 
  • #6
Mitchtwitchita said:
So, would it then be b)?
Please explain why this is your choice.
 
  • #7
because the Earth is pulling on the student while is is pushing away from the Earth at an equal and opposite direction?
 
  • #8
Mitchtwitchita said:
because the Earth is pulling on the student while is is pushing away from the Earth at an equal and opposite direction?
Your answer (b) is correct, but your explanation is a little bit off. The Earth is pulling downward on the student with a force equal to his weight, while the student is pulling upward on the Earth with a force equal to his weight.
 
  • #9
Ah, I see. Thanks for your help PhanthomJay!
 

What is Newton's Third Law hot air balloon?

Newton's Third Law hot air balloon is a type of hot air balloon designed to demonstrate Newton's Third Law of Motion. This law states that for every action, there is an equal and opposite reaction. In the case of a hot air balloon, the heated air inside the balloon rises, causing the balloon to lift off the ground.

How does a Newton's Third Law hot air balloon work?

A Newton's Third Law hot air balloon works by heating the air inside the balloon using a burner. As the air inside the balloon heats up, it becomes less dense and rises, creating an upward force that lifts the balloon off the ground. This is an example of Newton's Third Law in action, as the heated air pushes down on the surrounding cooler air, causing the balloon to rise.

What are the components of a Newton's Third Law hot air balloon?

The main components of a Newton's Third Law hot air balloon include the envelope (the fabric portion of the balloon), the basket (where the passengers stand), the burner (used to heat the air inside the envelope), and the fuel source (usually propane). The envelope is typically made of nylon or polyester and is designed to be lightweight and heat-resistant.

What are some real-life applications of Newton's Third Law hot air balloons?

Aside from being a popular recreational activity, Newton's Third Law hot air balloons have practical applications in scientific research and weather forecasting. They can also be used for aerial photography, advertising, and military surveillance. In addition, hot air balloons are often used in adventure tourism, providing a unique and exciting way to see the world from above.

What are some safety precautions for operating a Newton's Third Law hot air balloon?

Safety is a top priority when operating a hot air balloon. Some important precautions to take include checking weather conditions before flying, making sure the balloon is in good condition, and having a trained and licensed pilot. It is also important to have a safety briefing for passengers before taking off and to have proper safety equipment on board, such as fire extinguishers and first aid kits. In addition, hot air balloon pilots must follow strict regulations and obtain proper training and certification before operating a balloon.

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