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For astronomical bodies other than Earth, and for short distances of fall at other than "ground" level, g in the above equations may be replaced by (+) where G is the gravitational constant, M is the mass of the astronomical body, m is the mass of the falling body, and r is the radius from the falling object to the center of the astronomical body.
A common misconception occurs between centre of mass and centre of gravity.They are defined in similar ways but are not exactly the same quantity. Centre of mass is the mathematical description of placing all the mass in the region considered to one position, centre of gravity is a real physical quantity, the point of a body where the gravitational force acts.
Topspin in ball games is defined as spin about a horizontal axis perpendicular to the direction of travel that moves the top surface of the ball in the direction of travel. Under the Magnus effect, topspin produces a downward swerve of a moving ball, greater than would be produced by gravity alone.
A bandy ball is used, but the ball is slightly smaller and blue instead of the orange or cerise used in bandy. Rinkball sticks are a sport specific design. Rinkball combines elements of bandy , rink bandy , and ice hockey , but is now a separately organized sport after developing its own organizing bodies, codifying its own rules, and having ...
Street hockey (also known as shinny, dek hockey, ball hockey, road hockey or street roller hockey) is a collection of team sport variants played outdoors either on foot or with wheeled skates (either quad or in-line), using either a ball or puck designed for play on flat, dry surfaces. The object of every game is to score more goals than the ...
The theorem tells us how different parts of the mass distribution affect the gravitational force measured at a point located a distance r 0 from the center of the mass distribution: [13] The portion of the mass that is located at radii r < r 0 causes the same force at the radius r 0 as if all of the mass enclosed within a sphere of radius r 0 ...
In physics, action is a scalar quantity that describes how the balance of kinetic versus potential energy of a physical system changes with trajectory. Action is significant because it is an input to the principle of stationary action, an approach to classical mechanics that is simpler for multiple objects. [1]
In 1982 a Dutch inventor, Toon Coolen, patented a hockey stick with a "hook" head. The hockey stick manufacturers Grays took the design up in 1983 and the first mass-produced hockey sticks, with laminated timber head parts, were manufactured in Pakistan. This new design was possible because of the development of epoxy resin glues that did not ...