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(II) What will a spring scale read for the weight of a 53 -kgwoman in an elevator that moves (a) upward with constantspeed $5.0 \mathrm{m} / \mathrm{s},$ (b) downward with constant speed 5.0 $\mathrm{m} / \mathrm{s}$ ,(c) upward with acceleration $0.33 \mathrm{g},$ (d) downward withacceleration $0.33 \mathrm{g},$ and $(e)$ in free fall?

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a) 520$N$b) 520$N$c) 690$N$d) 350$N$e) 0$N$

Physics 101 Mechanics

Chapter 6

Gravitation and Newton's Synthesis

Physics Basics

Newton's Laws of Motion

Applying Newton's Laws

Gravitation

University of Michigan - Ann Arbor

Hope College

University of Winnipeg

McMaster University

Lectures

03:43

In physics, dynamics is the branch of physics concerned with the study of forces and their effect on matter, commonly in the context of motion. In everyday usage, "dynamics" usually refers to a set of laws that describe the motion of bodies under the action of a system of forces. The motion of a body is described by its position and its velocity as the time value varies. The science of dynamics can be subdivided into, Dynamics of a rigid body, which deals with the motion of a rigid body in the frame of reference where it is considered to be a rigid body. Dynamics of a continuum, which deals with the motion of a continuous system, in the frame of reference where the system is considered to be a continuum.

03:55

In physics, orbital motion is the motion of an object around another object, which is often a star or planet. Orbital motion is affected by the gravity of the central object, as well as by the resistance of deep space (which is negligible at the distances of most orbits in the Solar System).

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6.29. So we have a person standing in an elevator there, masses 53 kilograms, and we want to find out what the wait a scale they're standing on will display under several different conditions. So first of all, for all of them, we can figure out what the general, you know, behavior of this is going to be. This person is going to have their Lee directed downward. And then there's going to be a normal force directed upward, and this is what the scale is going to be reading as their way. And so then, using Newton's second law, we have the F N minus M. G. We're going to be calling downwards. Negative is equal to the mass times the net acceleration. And so the scale will be displaying the normal force, which is just going to be m times G plus a. So in both A and B, the acceleration is zero because it's moving at a constant speed and it doesn't matter what that speed is. So in this case, the normal forest is going to be mg, and this is 520 Newton's. Okay, see? So we're moving at 0.33 g upwards. So the acceleration has a positive sign and this will be 33% more than the, uh, the energy of the person be 690 Newton's here. The acceleration is negative. 0.33 So we're zero point 67 times mg, just 350 Newtons. And on the last case, we're in free fall, which means that the acceleration is negative G and so G plus negative g a zero, and so the person will be weightless.

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