Is Gravity Really a Force? A Look at General ... - Physics Forums
May 14, 2020 · Classically (meaning non-quantum and non-GR) gravity is described by Newton's law of Universal Gravitation, in which gravity is certainly a force. However, General Relativity …
When is g (9.8) negative or positive? - Physics Forums
Oct 22, 2013 · The acceleration due to gravity is a vector. It has a magnitude of 9.8 m/s², and its direction is downward. Whether or not that is negative or positive depends on your choice of …
Normal force at the top of a hill - Physics Forums
Sep 20, 2009 · The answer involves centrifugal force. Yes, it's not a true force, but you could use it to understand this problem. The inertia of the car is the centrifugal force. When it travels in a …
Understanding G-Force: x,y and z Components Explained
May 8, 2019 · Summary: What is G-Force? I've been to the amusement park recently, and one day I decided to use an app (Physics Toolbox), to collect some data. I downloaded the data, …
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 …
Why do the centripetal and gravitational force equal each other in ...
Oct 19, 2011 · The gravitational force is the ONLY force acting on the Satellite. The Centripetal force is the force we would need to have if the satellite is to travel in a circular path. The …
Normal force cancels out the force of gravity? - Physics Forums
Feb 26, 2015 · The normal force is perpendicular to the surface. Sometimes that means it also acts opposite the gravitational force (like when the surface is horizontal), but not always. Why …
Gravitational Force (Why the negative sign?) - Physics Forums
Aug 9, 2007 · Gravitational forces are considered negative due to the convention used in coordinate systems, where attractive forces are represented as acting inward. This negative …
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 …
Gravity: Point where Earth's Gravity and the Moon's cancel each …
Nov 27, 2006 · Well, the Earth and the moon, both have a gravity field, right? if we now consider the system moon-earth going around the sun, the gravity center is the point where the system …