FORCES
... m=mass(kg) g=9.8m/s2 Normal force = the support force exerted upon an object which is in contact with another stable object ...
... m=mass(kg) g=9.8m/s2 Normal force = the support force exerted upon an object which is in contact with another stable object ...
q 0 - Department of Physics | Oregon State
... More examples: What is the strength and direction of the electric field 1 nm from a proton? What force would an electron feel if placed in the field of that proton 1 nm away? ...
... More examples: What is the strength and direction of the electric field 1 nm from a proton? What force would an electron feel if placed in the field of that proton 1 nm away? ...
Uniform Circular Motion
... However, Newton, when writing for a world untutored in calculus, chose to present his proofs in the language of geometry. The simplest form of orbital motion is motion in a circle at constant speed. The geometric method by which Newton analyzed this problem is both simple and elegant. It is worth re ...
... However, Newton, when writing for a world untutored in calculus, chose to present his proofs in the language of geometry. The simplest form of orbital motion is motion in a circle at constant speed. The geometric method by which Newton analyzed this problem is both simple and elegant. It is worth re ...
Weightlessness
Weightlessness, or an absence of 'weight', is an absence of stress and strain resulting from externally applied mechanical contact-forces, typically normal forces from floors, seats, beds, scales, and the like. Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless. This is also termed ""zero-g"" where the term is more correctly understood as meaning ""zero g-force.""When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of weight is produced, as the contact forces from the moving structure act to overcome the body's inertia. In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field was zero. In such cases, g-forces are felt, and bodies are not weightless.When the gravitational field is non-uniform, a body in free fall suffers tidal effects and is not stress-free. Near a black hole, such tidal effects can be very strong. In the case of the Earth, the effects are minor, especially on objects of relatively small dimension (such as the human body or a spacecraft) and the overall sensation of weightlessness in these cases is preserved. This condition is known as microgravity and it prevails in orbiting spacecraft.