When objects are thrown or launched at an
... plane flying in a circle is the force of the string on the plane. The moon orbits Earth with nearly uniform circular motion. Earth's gravity is the force that causes this acceleration. Because the force, as well as the acceleration, is toward the center of the circle, these forces are often called c ...
... plane flying in a circle is the force of the string on the plane. The moon orbits Earth with nearly uniform circular motion. Earth's gravity is the force that causes this acceleration. Because the force, as well as the acceleration, is toward the center of the circle, these forces are often called c ...
Slide 1
... o Charge is quantised – comes in units of 1.6 x 10-19C Charge comes in two types, which are called Positive Negative o The total charge in any closed system cannot be changed o Charges interact with each other, causing Repulsive force if charges are the same (++ or --) Attractive forces if char ...
... o Charge is quantised – comes in units of 1.6 x 10-19C Charge comes in two types, which are called Positive Negative o The total charge in any closed system cannot be changed o Charges interact with each other, causing Repulsive force if charges are the same (++ or --) Attractive forces if char ...
6. Physics - Tsenkharla MSS
... 1. Do not write for the first fifteen minutes. This time is to be spent reading the questions. After having read the questions, you will be given one and a half hours to answer all questions. 2. In this paper, there are two sections: A and B. Section A is compulsory. You are expected to attempt any ...
... 1. Do not write for the first fifteen minutes. This time is to be spent reading the questions. After having read the questions, you will be given one and a half hours to answer all questions. 2. In this paper, there are two sections: A and B. Section A is compulsory. You are expected to attempt any ...
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.