HW4
... m/s2) = 6.6 kg. We choose +y upward and note there are two forces on the object: mg downward and T upward (in the cord that connects it to the balance; T is the reading on the scale by Newton’s third law). (a) “Upward at constant speed” means constant velocity, which means no acceleration. Thus, the ...
... m/s2) = 6.6 kg. We choose +y upward and note there are two forces on the object: mg downward and T upward (in the cord that connects it to the balance; T is the reading on the scale by Newton’s third law). (a) “Upward at constant speed” means constant velocity, which means no acceleration. Thus, the ...
Force and acceleration - University of Louisville Physics
... The classic Greek philosopher Aristotle (circa 400 B.C.) observed that all terrestrial objects come to rest unless they are acted upon by an external force. He thus related the effect of a force to the speed that the object obtained when that force acted. This observation is so commonplace that it i ...
... The classic Greek philosopher Aristotle (circa 400 B.C.) observed that all terrestrial objects come to rest unless they are acted upon by an external force. He thus related the effect of a force to the speed that the object obtained when that force acted. This observation is so commonplace that it i ...
G-Field
... (b) (i) A 1000 kg satellite is placed in a circular polar orbit so that it goes round the Earth 14 times a day. (Mass of Earth = 5.97 × 1024 kg) 1. Show that the period of the orbit is approximately 6170 s. 2. Calculate the radius of the orbit. (ii) To place the satellite in the orbit, the satellite ...
... (b) (i) A 1000 kg satellite is placed in a circular polar orbit so that it goes round the Earth 14 times a day. (Mass of Earth = 5.97 × 1024 kg) 1. Show that the period of the orbit is approximately 6170 s. 2. Calculate the radius of the orbit. (ii) To place the satellite in the orbit, the satellite ...
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.