If the instantaneous velocity vector of an object moving along a straight line i
ID: 1421228 • Letter: I
Question
If the instantaneous velocity vector of an object moving along a straight line is NEGATIVE, according to the usual sign convention, and its instantaneous acceleration vector is also NEGATIVE according to the same sign convention, this means that at this instant the object must be Slowing down Speeding up Traveling at constant velocity We need more information to determine whether the object " speeding up, slowing down, or traveling at constant speed. the situation described Is not possible, because the velocity and acceleration vectors must always have the same signs. Identify the statement below which is correct: Instantaneous velocity is given by the area under the displacement-time graph Instantaneous acceleration is given by the slope of the tangent to the velocity-time graph. Instantaneous velocity Is given by the slope of the tangent to the acceleration-time graph the displacement is given by the slope of the tangent to the acceleration-ti me graph E> None of the statements A through 0 Is correct. Which of the following statements includes all the essential elements of Newton's fl law? A body at rest persists in its state of rest unless acted on by a non-zero net ext force. A body persists in its state of rest or of uniform motion in a straight line as net external force remains constant. the acceleration of a body Is proportional to the net external force acting the mass of the body A body persists In its state of rest or of uniform motion in a straight line on by a non-zero net external force. Force is equal in magnitude to mass multiplied by acceleration. Because the forces demanded by Newton's third law of motion ore equal in and opposite in direction, how can anything ever be accelerated' AJ Newton's second law is more important. Third taw forces (actions and reactions) cannot cause accelerations C the action. and the reaction MUST (by definition) act on different bodies Newton's third law only applies when there is NO acceleration. Frictional forces cancel out the effects of newton's third law.A rock is thrown straight up from the earth's surface. Which one of the following statement's concerning the net force acting on the rock at the top of it's path, when it is instantaneously equal to zero. the net force is equal to the weight of rock. the direction of the net force changes from up to down. the net force is greater than the weight of the rock. the net force is less than the weight of the rock, but greater than zeroExplanation / Answer
1.)
A. slowing down