Plane flying in a straight line

AI Thread Summary
When an aircraft flies in a straight line at constant speed, there are forces acting on it, specifically lift and weight. According to Newton's laws, if the plane is in equilibrium, these forces are equal and opposite, resulting in no net force. This means that while the forces are present, they balance each other out, allowing for straight-line flight. Understanding this concept is crucial for aspiring pilots and those interested in aerodynamics. The discussion highlights the importance of recognizing both the presence of forces and their balance in flight dynamics.
justice25
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If an aircraft is flying in a straight line, are there no forces acting on it, or is there an upward force acting on it?
 
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What do you think? (I assume you mean in a straight line with constant speed.)

What do Newton's laws tell you?
 
Hello, thank you for the reply.

I'm only 11 years old, but I want to be a pilot when I'm older so I'm trying to learn what I can about aerodynamics and I came across this question, please go easy on me :redface:

I think from what I've read, that there is equal lift and equal weight, so there is no resultant force, but the question asks "are there any forces acting on the plane?" so I'm just a bit confused about what to answer, thank you for your time.
 
I think you've got it: The key is that since the plane is moving in a straight line at constant speed there is no net force on it. But there are certainly forces acting on it. Weight and lift are two of them.

Welcome to PF, by the way.
 

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