force and laws of motion
... comes to a stop in 5s.Waht will be the force exerted by the car on the tree? 21.A force of 0.6 N acting on a body increases its velocity from 5m/s to 6m/s in 2s. Calculate the mass of the body. 22.For how much time should the force of 400N be exerted on a body of mass 8kg to increase its velocity fr ...
... comes to a stop in 5s.Waht will be the force exerted by the car on the tree? 21.A force of 0.6 N acting on a body increases its velocity from 5m/s to 6m/s in 2s. Calculate the mass of the body. 22.For how much time should the force of 400N be exerted on a body of mass 8kg to increase its velocity fr ...
Charged Particles in Electric Fields
... • An electric field shows the direction and relative magnitude of an electric force. (Field theory, E = F/q) • The electric force will cause an acceleration. (Newton's Second Law) • An acceleration will cause an object to start moving one direction or another. (Newton's First Law) • So, if we place ...
... • An electric field shows the direction and relative magnitude of an electric force. (Field theory, E = F/q) • The electric force will cause an acceleration. (Newton's Second Law) • An acceleration will cause an object to start moving one direction or another. (Newton's First Law) • So, if we place ...
Quiz __
... If a 100 N force (F) was applied for 2 s (t) to a 20 kg (m) object initially moving at 2 m/s (vi), what would be the object’s final velocity (vf)? ...
... If a 100 N force (F) was applied for 2 s (t) to a 20 kg (m) object initially moving at 2 m/s (vi), what would be the object’s final velocity (vf)? ...
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.