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- https://phys.libretexts.org/Courses/Joliet_Junior_College/Physics_201_-_Fall_2019v2/Book%3A_Custom_Physics_textbook_for_JJC/04%3A_Motion_Along_a_Straight_Line_-_with_Vectors/4.07%3A_Free_FallAn object in free fall experiences constant acceleration if air resistance is negligible. On Earth, all free-falling objects have an acceleration g due to gravity, which averages g = 9.81 m/s^2. For o...An object in free fall experiences constant acceleration if air resistance is negligible. On Earth, all free-falling objects have an acceleration g due to gravity, which averages g = 9.81 m/s^2. For objects in free fall, the upward direction is normally taken as positive for displacement, velocity, and acceleration.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/General_Physics_I%3A_Classical_Mechanics/54%3A_Gravity/54.03%3A_The_Cavendish_ExperimentIn his experiment, Cavendish attached two heavy masses to the ends of a rod; the rod was then suspended at its balance point from a vertical wire that was attached to the ceiling, forming a torsional ...In his experiment, Cavendish attached two heavy masses to the ends of a rod; the rod was then suspended at its balance point from a vertical wire that was attached to the ceiling, forming a torsional pendulum. From knowing the masses, their separation, the torsional "Hooke's law" constant \(\kappa\), and the angle of rotation, Cavendish was able to determine the value of \(G\).
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Physics_I_(2211)/03%3A_Kinematics_Quantities/3.06%3A_Free_FallThe fuse is timed to ignite the shell just as it reaches its highest point above the ground. (a) Calculate the height at which the shell explodes. (b) How much time passes between the launch of the sh...The fuse is timed to ignite the shell just as it reaches its highest point above the ground. (a) Calculate the height at which the shell explodes. (b) How much time passes between the launch of the shell and the explosion? (c) What is the horizontal displacement of the shell when it explodes? (d) What is the total displacement from the point of launch to the highest point?
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/08%3A_Energy_Physics_and_Chemistry/8.04%3A_Work_and_Energy/8.4.01%3A_Potential_Energy-_Gravity_and_SpringsWe've seen how energy can exist because of the movement of an object. As it turns out, energy can also exist within an object because it has the potential to have some sort of movement. There are mult...We've seen how energy can exist because of the movement of an object. As it turns out, energy can also exist within an object because it has the potential to have some sort of movement. There are multiple examples of this, but for now we will look at two: gravity and springs. Later in this chapter we will revisit the idea of energy and other ways in which we might categorize it.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/General_Physics_I%3A_Classical_Mechanics/26%3A_Energy/26.02%3A_Potential_Energy\[\frac{1}{h+R_{\oplus}}=\frac{1}{R_{\oplus}}-\frac{h}{R_{\oplus}^{2}}+\frac{h^{2}}{R_{\oplus}^{3}}-\frac{h^{3}}{R_{\oplus}^{4}}+\cdots\] \[U(h) =G M_{\oplus} m\left[\frac{1}{R_{\oplus}}-\left(\frac{1...\[\frac{1}{h+R_{\oplus}}=\frac{1}{R_{\oplus}}-\frac{h}{R_{\oplus}^{2}}+\frac{h^{2}}{R_{\oplus}^{3}}-\frac{h^{3}}{R_{\oplus}^{4}}+\cdots\] \[U(h) =G M_{\oplus} m\left[\frac{1}{R_{\oplus}}-\left(\frac{1}{R_{\oplus}}-\frac{h}{R_{\oplus}^{2}}+\frac{h^{2}}{R_{\oplus}^{3}}-\frac{h^{3}}{R_{\oplus}^{4}}+\cdots\right)\right] \]
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/General_Physics_I%3A_Classical_Mechanics/54%3A_GravityThe English physicist Sir Isaac Newton developed his theory of the gravitational force in his famous work Philosophice Naturalis Principia Mathematica. In modern language and notation, it states that ...The English physicist Sir Isaac Newton developed his theory of the gravitational force in his famous work Philosophice Naturalis Principia Mathematica. In modern language and notation, it states that the force \(F\) between two point masses \(m_{1}\) and \(m_{2}\) separated by a distance \(r\) is given by \[F=-G \frac{m_{1} m_{2}}{r^{2}}\]
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_1030%3A_General_Physics_I/03%3A_Two-Dimensional_Kinematics/3.3%3A_Projectile_MotionProjectile motion is a form of motion where an object moves in parabolic path; the path that the object follows is called its trajectory.
- https://phys.libretexts.org/Courses/Joliet_Junior_College/PHYS202_-_JJC_-_Testing/01%3A_Conceptual_Objective_1/1.01%3A_OverviewAtoms contain negatively charged electrons and positively charged protons; the number of each determines the atom’s net charge.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/17%3A_Electric_Charge_and_Field/17.1%3A_OverviewAtoms contain negatively charged electrons and positively charged protons; the number of each determines the atom’s net charge.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/General_Physics_I%3A_Classical_Mechanics/54%3A_Gravity/54.04%3A_Helmerts_EquationThis value is just a standard value used for the definitions of some units (for example, in the conversion between pounds-force and newtons). The acceleration due to gravity \(g\) at the surface of th...This value is just a standard value used for the definitions of some units (for example, in the conversion between pounds-force and newtons). The acceleration due to gravity \(g\) at the surface of the Earth varies over the surface of the Earth for a number of reasons: Also, the Earth has an equatorial bulge due to its rotation, so that you're farther from the center of the Earth near the equator.
- https://phys.libretexts.org/Courses/Grossmont_College/ASTR_110%3A_Astronomy_(Fitzgerald)/02%3A_History_of_Astronomy/2.06%3A_Newtons_Universal_Law_of_GravitationGravity, the attractive force between all masses, is what keeps the planets in orbit. Newton’s universal law of gravitation relates the gravitational force to mass and distance. The force of gravity i...Gravity, the attractive force between all masses, is what keeps the planets in orbit. Newton’s universal law of gravitation relates the gravitational force to mass and distance. The force of gravity is what gives us our sense of weight. Unlike mass, which is constant, weight can vary depending on the force of gravity (or acceleration) you feel. When Kepler’s laws are reexamined in the light of Newton’s gravitational law, it becomes clear that the masses of both objects are important.
