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  1. When is g (9.8) negative or positive? - Physics Forums

    Oct 22, 2013 · The acceleration due to gravity, g (9.8 m/s²), can be classified as either positive or negative depending on the chosen coordinate system. If upward is defined as positive, then …

  2. Is Gravity Really a Force? A Look at General ... - Physics Forums

    May 14, 2020 · Gravity is described by general relativity as the curvature of spacetime rather than a traditional force, creating a perceived contradiction since it is still classified as one of the four …

  3. Understanding G-Force: x,y and z Components Explained

    May 8, 2019 · G-Force has x, y, and z components that represent different directions of acceleration experienced in a moving vehicle. The x-axis typically corresponds to side-to-side …

  4. Why do the centripetal and gravitational force equal each other in ...

    Oct 19, 2011 · In orbit, the centripetal force required for a satellite to maintain its circular path is provided entirely by gravitational force, which is why they equal each other. The gravitational …

  5. Normal force at the top of a hill - Physics Forums

    Sep 20, 2009 · At the top of a hill, a car experiences a normal force acting upward, while gravity and centripetal force act downward. The equation for normal force is derived as Fn = Fg - Fr, …

  6. How Do Gravity, Force, and Buoyancy Interact? - Physics Forums

    Aug 29, 2003 · Gravity is a universal force that attracts all mass towards each other, while buoyancy is the upward force exerted by a fluid that opposes gravity. Buoyancy results from …

  7. Normal force at the top of a vertical loop - Physics Forums

    Oct 17, 2022 · The discussion centers on the relationship between normal force and centripetal force at the top of a vertical loop. It explains that the normal force is necessary for an object to …

  8. Learn All About Earth's Gravity - Physics Forums

    Jan 2, 2016 · Gravity in Earth’s interior In addition to knowing the gravitational field at different points on the surface, we also have information about how the gravitational field changes as …

  9. Normal force cancels out the force of gravity? - Physics Forums

    Feb 26, 2015 · Alright, so I know there will be a normal force pointing perpendicular to the surface and gravitational force, right? Gravitational force = mg But since normal force acts in "opposite …

  10. How Can Gravity Be Expressed as a Function of Density?

    Aug 12, 2011 · The discussion revolves around expressing gravity as a function of a planet's density. The gravitational strength is defined by the formula g = M*G/r^2, where M is mass, G …