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The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse.. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae—in which gravity plays a dominant ro
Equations for a falling body. A set of equations describing the trajectories of objects subject to a constant gravitational force under normal Earth -bound conditions. Assuming constant acceleration g due to Earth’s gravity, Newton's law of universal gravitation simplifies to F = mg, where F is the force exerted on a mass m by the Earth’s ...
Free fall. In classical mechanics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it. An object in the technical sense of the term "free fall" may not necessarily be falling ...
Free body diagram of a body on which only gravity and air resistance acts The free body diagram on the right is for a projectile that experiences air resistance and the effects of gravity. Here, air resistance is assumed to be in the direction opposite of the projectile's velocity: F a i r = − f ( v ) ⋅ v ^ {\displaystyle \mathbf {F ...
Floor slip resistance testing is the science of measuring the coefficient of friction (or resistance to slip accidents) of flooring surfaces, either in a laboratory (before or after installation) or on floors in situ. Slip resistance testing (or floor friction testing) is usually desired by the building's owner or manager when there has been a ...
To attend the Military Free-Fall JumpMaster Course (MFFJMC), students must have graduated from the U.S. Army Airborne School, the MFFPC, the U.S. Army Jumpmaster School, be a current military free-fall parachutist, served as a military free-fall parachutist for a minimum of one year, and must have completed at least 50 military free-fall jumps.
Isaac Newton 's sine-squared law of air resistance is a formula that implies the force on a flat plate immersed in a moving fluid is proportional to the square of the sine of the angle of attack. Although Newton did not analyze the force on a flat plate himself, the techniques he used for spheres, cylinders, and conical bodies were later ...
Terminal velocity is the maximum speed attainable by an object as it falls through a fluid ( air is the most common example). It is reached when the sum of the drag force ( Fd) and the buoyancy is equal to the downward force of gravity ( FG) acting on the object. Since the net force on the object is zero, the object has zero acceleration.