Weight of an Astronaut Between Two Stars - Newton's Laws of Motion Explained

  • Thread starter Thread starter trulyfalse
  • Start date Start date
  • Tags Tags
    Dynamics Theory
Click For Summary
SUMMARY

The discussion centers on the concept of weightlessness experienced by an astronaut positioned at the midpoint between two stars of equal mass, as explained through Newton's laws of motion. The astronaut is indeed weightless due to the equal gravitational forces acting in opposite directions, resulting in a net force of zero. This scenario highlights that weightlessness occurs not solely due to the absence of gravity but rather from the balance of forces. Additionally, the question of whether an astronaut in orbit around a single star experiences weightlessness is raised, emphasizing the complexities of gravitational acceleration.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Basic knowledge of gravitational forces
  • Familiarity with the concept of weight and mass
  • Concept of orbital mechanics
NEXT STEPS
  • Study the implications of Newton's laws of motion in various gravitational fields
  • Explore the concept of weightlessness in different orbital scenarios
  • Learn about gravitational acceleration and its effects on objects in space
  • Investigate the principles of equilibrium in gravitational systems
USEFUL FOR

Students of physics, educators explaining gravitational concepts, and anyone interested in the dynamics of motion in space will benefit from this discussion.

trulyfalse
Messages
35
Reaction score
0
I'm back again, this time regarding questions relating to Newton's laws of motion. :)

Homework Statement


Imagine an astronaut in space at the midpoint between two stars of equal mass. If all other objects are infinitely far away, how much does the astronaut weigh? Explain your answer.

The Attempt at a Solution


I'm not sure how to answer this, my initial thought was weightless, because equal forces of gravity are acting in opposite directions.
 
Physics news on Phys.org
He would be weightless, yes, but not for the reason you mention.

If you think about weight of an object as how much force is applied to the surface of this object (i.e. how much force an astronaut feels on his feet when standing), then under what circumstances would there always be weightlessness? Would an astronaut in orbit around a single star be weightless despite that he is accelerated by gravity?
 
Last edited:

Similar threads

Proving Newton's 3rd law from conservation of momentum
  • · Replies 2 ·
Replies
2
Views
1K
Solving for Acceleration when weight is in Newtons instead of Kg
  • · Replies 6 ·
Replies
6
Views
3K
Rank forces according to magnitude: Newton's 2nd/3rd laws
  • · Replies 5 ·
Replies
5
Views
7K
Newton's Third Law Problem: Two masses, a rope and a pulley
  • · Replies 21 ·
Replies
21
Views
11K
Undergrad Newton's Third Law: Action & Reaction Along the Line Connecting Two Objects
  • · Replies 5 ·
Replies
5
Views
2K
Relationship between material mass and weight
  • · Replies 5 ·
Replies
5
Views
2K
Newton's third law a book and table
  • · Replies 2 ·
Replies
2
Views
14K
Can anyone explain more for me Newton's 3rd Law of Motion?
  • · Replies 3 ·
Replies
3
Views
4K
Two Questions on Newton Law Problems
  • · Replies 5 ·
Replies
5
Views
3K
Circular motion in the vertical plane
  • · Replies 1 ·
Replies
1
Views
2K