text: # Feedback Comments on Gravitation
  
  by Ron Kurtus
  
  A total of 64 comments and questions have been sent in on Gravitation. They are listed according to date.
  
  You can read them to further your understanding of the subject.
  
  ## List of next 10 letters
  
  ### Country
  
  Force Between Two Objects Objects being pulled together USA
  
  Force Between Two Objects Relationship of force between two objects Nepal
  
  Force Between Two Objects Why aren't we pulled toward a building? India
  
  Gravitational Escape Velocity Derivation Velocity at infinity India
  
  Force Between Two Objects Finding force of attraction Nigeria
  
  Cavendish Experiment How was G calcualted Nepal
  
  Gravitational Escape Velocity Throwing a ball upward USA
  
  Gravitational Escape Velocity Escape velocity equation Malaysia
  
  Force Between Two Objects Why doesn't the Moon collide with the Earth? India
  
  Law of Universal Gravitation Why don't lakes have tides? Nepal
  
  Next 10
  
  First 10 letters
  
  ## Objects being pulled together
  
  Topic: Force Between Two Objects
  
  ### Question
  
  July 28, 2014
  
  When body A and body B are being pulled together by F =Gmm/d^2,
  
  If body A's mass is 100 times greater than body B's mass, what are their relative accelerations, when they being pulled together by gravity?
  
  Is this like a lead-filled ping pong ball and a hollow ping pong ball being pulled together by one rubber band, which is wrapped around both ping pong balls. Obviously, the hollow ball will travel farther than the lead-filled ball. But how much farther? What is the formula for their relative accelerations?
  
  Dick - USA
  
  25182
  
  The force on each is determined by F = GMm/d^2. Thus F(1) = Ma(1) and F(2) = ma(2), where a(1) and a(2) are the accelerations.
  
  However, the objects will move together toward their center of mass. See Center of Mass Location and Motion for more information.
  
  ## Relationship of force between two objects
  
  Topic: Force Between Two Objects
  
  ### Question
  
  May 16, 2014
  
  what is the relationsip between the fore of gravitation and masses of two object and their central distance?
  
  jitu rana - Nepal
  
  24966
  
  The lesson Gravitational Force Between Two Objects gives the equation:
  
  F = GMm/R^2
  
  ## Why aren't we pulled toward a building?
  
  Topic: Force Between Two Objects
  
  ### Question
  
  May 5, 2014
  
  gravitational force is between a boy and building.Why we are not pull towards the building?
  
  Prameet - India
  
  24928
  
  You are pulled toward a building, but the force is so small that you do not notice it or it has no effect on you. The reason is that the mass of the building does not create enough gravitational force. Look at how large the Earth is and compare it with the force the Earth-s gravity has on your body.
  
  ## Velocity at infinity
  
  Topic: Gravitational Escape Velocity Derivation
  
  ### Question
  
  April 26, 2014
  
  a body is projected from the surface of earth with a velocity v=2((gR)1/2) where g is acceleration due to gravity on earth surface and R is the radius of earth then what is the velocity of body at infinity ? plse sir give quick response to my question!!!!
  
  PRIYANKA - India
  
  24898
  
  At infinity, the kinetic energy and thus the velocity of the object = 0.
  
  ## Finding force of attraction
  
  Topic: Force Between Two Objects
  
  ### Question
  
  March 4, 2014
  
  A body of mass 25gm was placed at a distance of 15cm from another body of mass 42gm, find the force of attraction
  
  Kingsley - Nigeria
  
  24571
  
  Apply the equation F = GMm/R^2 shown in Gravitational Force Between Two Objects, where G = 6.674*10^?11 N-m^2/kg^2, M = 25 gm, m = 42 gm and R = 15 cm.
  
  You must convert gm to kg and cm to m before doing the calculations.
  
  ## How was G calcualted
  
  Topic: Cavendish Experiment
  
  ### Question
  
  February 5, 2014
  
  How cavendish caculate the value of 'G' gravitational constant? Explain it details?
  
  bikash - Nepal
  
  24494
  
  The lesson Cavendish Experiment to Measure Gravitational Constant shows how masses turned a fine wire. The amount of torques was measured and used in the equations in the lesson to calculate G.
  
  ## Throwing a ball upward
  
  Topic: Gravitational Escape Velocity
  
  ### Question
  
  January 31, 2014
  
  I have the strength to throw a basketball straight up into the air at 2meters per second and the ball returns and hits the ground lets say after 15 seconds , how high has the ball travelled ? thank you so much
  
  K - USA
  
  24474
  
  There is something wrong with your numbers. If it took 15 seconds for the ball to hit the ground, your initial velocity would have to be 284 m/s.
  
  If you threw the ball upward at 2 m/s, the maximum height would be 0.2 m.
  
  See Gravity Displacement Equations for Objects Projected Upward for the equations,
  
  ## Escape velocity equation
  
  Topic: Gravitational Escape Velocity
  
  ### Question
  
  January 19, 2014
  
  This is the question that was given in my school.
  'A quantity X is defined by the expression X = ?(2GM/R)
  where G is a constant which has a units of Nm2kg-2
  M represents the mass of a planet
  R represents the radius of the planet.
  What physical quantity does X represent? '
  
  So what is X? Velocity or Speed ?
  
  Thank You :)
  
  Jia Jia - Malaysia
  
  24446
  
  The escape velocity equation is v = -SQRT(2GM/R), where SQRT means square root.
  
  If you would square both sides of the equation, you would get v^2 = 2GM/R.
  
  Thus, in your problem, X is the escape velocity squared. Units would be m^2/s^2.
  
  ## Why doesn't the Moon collide with the Earth?
  
  Topic: Force Between Two Objects
  
  ### Question
  
  December 20, 2013
  
  i have a dout sir ,that is why moon does not collied earth due to gravitational force and planets also why does collide sun due to gravity
  
  jayanth - India
  
  24361
  
  Although the gravitational force of the Earth attracts the Moon, the velocity of the Moon creates a centrifugal force that pulls the Moon away from the Earth. The gravitational force and centrifugal forces cancel out, allowing the Moon to rotate around the Earth.
  
  However, if the Moon would slow down, then it could spiral into the Earth.
  
  The same effect works with the Earth and planets rotating around the Sun. Their velocities form an equilibrium with the gravitation.
  
  See Centripetal Force and Centrifugal Force for more information.
  
  ## Why don't lakes have tides?
  
  Topic: Law of Universal Gravitation
  
  ### Question
  
  October 9, 2013
  
  Why does the tides occur in ocean but in lakes???
  The mass of big body attract small body if so why doesn't satellite attract the astronaut towards it self
  
  Asesh - Nepal
  
  24086
  
  Actually, tides do occur in lakes. But since the amount of water and depth of the water in a lake is much less than in the ocean, the tides in lakes is much smaller and sometimes not noticeable.
  
  See: Gravitation Causes Tides on Earth for more information on tides.
  
  Next 10
  
  ## Summary
  
  Hopefully, this reader feedback has helped provide information about Gravitation issues.
  
  Learn from others
  
  ## Resources and references
  
  The following are some resources on this topic.
  
  ### Websites
  
  Gravitation Resources
  
  ### Books
  
  Top-rated books on Gravitation
  
  ## Questions and comments
  
  Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.
  
  Feel free to establish a link from your website to pages in this site.
  
  ## Where are you now?
  
  School for Champions
  
  Gravitation topics
  
  ## Gravity
  
  ### Let's make the world a better place
  
  Be the best that you can be.
  
  Use your knowledge and skills to help others succeed.
  
  Don't be wasteful; protect our environment.
  
  ### Live Your Life as a Champion:
  
  Take care of your health
  
  Seek knowledge and gain skills
  
  Do excellent work
  
  Be valuable to others
  
  Have utmost character
  
  #### Be a Champion!
  
  The School for Champions helps you become the type of person who can be called a Champion.
explanation: The document is a compilation of feedback comments and questions on the topic of Gravitation, collected from various users. Each entry includes the date, the user's question or comment, and a response from the author, Ron Kurtus. The document contains multiple questions and corresponding answers on various aspects of gravitation, such as the force between two objects, gravitational escape velocity, and the Cavendish experiment.
distilabel_metadata.content: Evaluate the user given text extract and determine if it contains a math question and optionally and answer to this question.
  
  Output rules:
  
  1. Briefly describe the document and mention if it contains a question or a question and answer.
  2. Finalize the output with: Label: no-question,question,question-and-answer,multiple-question,multiple-question-and-answer
distilabel_metadata.role: system
distilabel_metadata.content: # Feedback Comments on Gravitation
  
  by Ron Kurtus
  
  A total of 64 comments and questions have been sent in on Gravitation. They are listed according to date.
  
  You can read them to further your understanding of the subject.
  
  ## List of next 10 letters
  
  ### Country
  
  Force Between Two Objects Objects being pulled together USA
  
  Force Between Two Objects Relationship of force between two objects Nepal
  
  Force Between Two Objects Why aren't we pulled toward a building? India
  
  Gravitational Escape Velocity Derivation Velocity at infinity India
  
  Force Between Two Objects Finding force of attraction Nigeria
  
  Cavendish Experiment How was G calcualted Nepal
  
  Gravitational Escape Velocity Throwing a ball upward USA
  
  Gravitational Escape Velocity Escape velocity equation Malaysia
  
  Force Between Two Objects Why doesn't the Moon collide with the Earth? India
  
  Law of Universal Gravitation Why don't lakes have tides? Nepal
  
  Next 10
  
  First 10 letters
  
  ## Objects being pulled together
  
  Topic: Force Between Two Objects
  
  ### Question
  
  July 28, 2014
  
  When body A and body B are being pulled together by F =Gmm/d^2,
  
  If body A's mass is 100 times greater than body B's mass, what are their relative accelerations, when they being pulled together by gravity?
  
  Is this like a lead-filled ping pong ball and a hollow ping pong ball being pulled together by one rubber band, which is wrapped around both ping pong balls. Obviously, the hollow ball will travel farther than the lead-filled ball. But how much farther? What is the formula for their relative accelerations?
  
  Dick - USA
  
  25182
  
  The force on each is determined by F = GMm/d^2. Thus F(1) = Ma(1) and F(2) = ma(2), where a(1) and a(2) are the accelerations.
  
  However, the objects will move together toward their center of mass. See Center of Mass Location and Motion for more information.
  
  ## Relationship of force between two objects
  
  Topic: Force Between Two Objects
  
  ### Question
  
  May 16, 2014
  
  what is the relationsip between the fore of gravitation and masses of two object and their central distance?
  
  jitu rana - Nepal
  
  24966
  
  The lesson Gravitational Force Between Two Objects gives the equation:
  
  F = GMm/R^2
  
  ## Why aren't we pulled toward a building?
  
  Topic: Force Between Two Objects
  
  ### Question
  
  May 5, 2014
  
  gravitational force is between a boy and building.Why we are not pull towards the building?
  
  Prameet - India
  
  24928
  
  You are pulled toward a building, but the force is so small that you do not notice it or it has no effect on you. The reason is that the mass of the building does not create enough gravitational force. Look at how large the Earth is and compare it with the force the Earth-s gravity has on your body.
  
  ## Velocity at infinity
  
  Topic: Gravitational Escape Velocity Derivation
  
  ### Question
  
  April 26, 2014
  
  a body is projected from the surface of earth with a velocity v=2((gR)1/2) where g is acceleration due to gravity on earth surface and R is the radius of earth then what is the velocity of body at infinity ? plse sir give quick response to my question!!!!
  
  PRIYANKA - India
  
  24898
  
  At infinity, the kinetic energy and thus the velocity of the object = 0.
  
  ## Finding force of attraction
  
  Topic: Force Between Two Objects
  
  ### Question
  
  March 4, 2014
  
  A body of mass 25gm was placed at a distance of 15cm from another body of mass 42gm, find the force of attraction
  
  Kingsley - Nigeria
  
  24571
  
  Apply the equation F = GMm/R^2 shown in Gravitational Force Between Two Objects, where G = 6.674*10^?11 N-m^2/kg^2, M = 25 gm, m = 42 gm and R = 15 cm.
  
  You must convert gm to kg and cm to m before doing the calculations.
  
  ## How was G calcualted
  
  Topic: Cavendish Experiment
  
  ### Question
  
  February 5, 2014
  
  How cavendish caculate the value of 'G' gravitational constant? Explain it details?
  
  bikash - Nepal
  
  24494
  
  The lesson Cavendish Experiment to Measure Gravitational Constant shows how masses turned a fine wire. The amount of torques was measured and used in the equations in the lesson to calculate G.
  
  ## Throwing a ball upward
  
  Topic: Gravitational Escape Velocity
  
  ### Question
  
  January 31, 2014
  
  I have the strength to throw a basketball straight up into the air at 2meters per second and the ball returns and hits the ground lets say after 15 seconds , how high has the ball travelled ? thank you so much
  
  K - USA
  
  24474
  
  There is something wrong with your numbers. If it took 15 seconds for the ball to hit the ground, your initial velocity would have to be 284 m/s.
  
  If you threw the ball upward at 2 m/s, the maximum height would be 0.2 m.
  
  See Gravity Displacement Equations for Objects Projected Upward for the equations,
  
  ## Escape velocity equation
  
  Topic: Gravitational Escape Velocity
  
  ### Question
  
  January 19, 2014
  
  This is the question that was given in my school.
  'A quantity X is defined by the expression X = ?(2GM/R)
  where G is a constant which has a units of Nm2kg-2
  M represents the mass of a planet
  R represents the radius of the planet.
  What physical quantity does X represent? '
  
  So what is X? Velocity or Speed ?
  
  Thank You :)
  
  Jia Jia - Malaysia
  
  24446
  
  The escape velocity equation is v = -SQRT(2GM/R), where SQRT means square root.
  
  If you would square both sides of the equation, you would get v^2 = 2GM/R.
  
  Thus, in your problem, X is the escape velocity squared. Units would be m^2/s^2.
  
  ## Why doesn't the Moon collide with the Earth?
  
  Topic: Force Between Two Objects
  
  ### Question
  
  December 20, 2013
  
  i have a dout sir ,that is why moon does not collied earth due to gravitational force and planets also why does collide sun due to gravity
  
  jayanth - India
  
  24361
  
  Although the gravitational force of the Earth attracts the Moon, the velocity of the Moon creates a centrifugal force that pulls the Moon away from the Earth. The gravitational force and centrifugal forces cancel out, allowing the Moon to rotate around the Earth.
  
  However, if the Moon would slow down, then it could spiral into the Earth.
  
  The same effect works with the Earth and planets rotating around the Sun. Their velocities form an equilibrium with the gravitation.
  
  See Centripetal Force and Centrifugal Force for more information.
  
  ## Why don't lakes have tides?
  
  Topic: Law of Universal Gravitation
  
  ### Question
  
  October 9, 2013
  
  Why does the tides occur in ocean but in lakes???
  The mass of big body attract small body if so why doesn't satellite attract the astronaut towards it self
  
  Asesh - Nepal
  
  24086
  
  Actually, tides do occur in lakes. But since the amount of water and depth of the water in a lake is much less than in the ocean, the tides in lakes is much smaller and sometimes not noticeable.
  
  See: Gravitation Causes Tides on Earth for more information on tides.
  
  Next 10
  
  ## Summary
  
  Hopefully, this reader feedback has helped provide information about Gravitation issues.
  
  Learn from others
  
  ## Resources and references
  
  The following are some resources on this topic.
  
  ### Websites
  
  Gravitation Resources
  
  ### Books
  
  Top-rated books on Gravitation
  
  ## Questions and comments
  
  Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.
  
  Feel free to establish a link from your website to pages in this site.
  
  ## Where are you now?
  
  School for Champions
  
  Gravitation topics
  
  ## Gravity
  
  ### Let's make the world a better place
  
  Be the best that you can be.
  
  Use your knowledge and skills to help others succeed.
  
  Don't be wasteful; protect our environment.
  
  ### Live Your Life as a Champion:
  
  Take care of your health
  
  Seek knowledge and gain skills
  
  Do excellent work
  
  Be valuable to others
  
  Have utmost character
  
  #### Be a Champion!
  
  The School for Champions helps you become the type of person who can be called a Champion.
distilabel_metadata.role: user
distilabel_metadata.raw_output_q_a_detector_0: The document is a compilation of feedback comments and questions on the topic of Gravitation, collected from various users. Each entry includes the date, the user's question or comment, and a response from the author, Ron Kurtus. The document contains multiple questions and corresponding answers on various aspects of gravitation, such as the force between two objects, gravitational escape velocity, and the Cavendish experiment.
  
  Label: multiple-question-and-answer