Workbooklet 2.5 exercises page 14
... 6. A body of mass 2.5 kg is projected vertically with an initial speed of 40 m/s. (a) What is the initial kinetic energy of the body? (b) What is the kinetic energy of the body when it reaches its maximum height? (c) How much potential energy does the body gain as it rises from the point of project ...
... 6. A body of mass 2.5 kg is projected vertically with an initial speed of 40 m/s. (a) What is the initial kinetic energy of the body? (b) What is the kinetic energy of the body when it reaches its maximum height? (c) How much potential energy does the body gain as it rises from the point of project ...
CP1 Key words
... in numbers. It is calculated by taking the vertical distance between two points and dividing by the horizontal distance between the same two points. ...
... in numbers. It is calculated by taking the vertical distance between two points and dividing by the horizontal distance between the same two points. ...
and the three laws of motion
... 1ST LAW OF MOTION “ Every body continues in its state of rest or uniform speed in a straight line unless it is compelled to change that state by a net force acting on it.” ...
... 1ST LAW OF MOTION “ Every body continues in its state of rest or uniform speed in a straight line unless it is compelled to change that state by a net force acting on it.” ...
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.