Object At Rest
Object At Rest - Related Videos
01:21
The Resting Membrane Potential
0 Views •
2019
Overview The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane. The Inside of a Neuron Is More Negative The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular...
01:15
Resting Potential Decay
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2024
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps. At rest, the K+ is the main ion that moves across the membrane through...
01:24
Resting Membrane Potential
0 Views •
2023
The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane. The Inside of a Neuron is More Negative The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
14:38
Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Cited by 12 •
2012
We describe a novel methodology for creating naturalistic 3-D objects and object categories with precisely defined feature variations. We use simulations of the biological processes of morphogenesis and phylogenesis to create novel, naturalistic virtual 3-D objects and object categories that can then be rendered as visual images or haptic objects.
01:11
Pressure Variation in a Fluid at Rest
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2025
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth. When measuring pressure at two different levels within the fluid, the difference in pressure...
FAQs
Rest depends on the observer’s chosen reference frame, so the same object can be stationary for one observer but changing position for another. This distinction matters when describing a book, bridge, or vehicle, because conclusions about position and motion must specify the frame used. Physics analysis therefore treats rest as a relational condition rather than an absolute property.
A zero net force prevents translational acceleration, while a zero net torque prevents rotational acceleration. Checking only one condition can give an incomplete stability assessment: an object may avoid moving from one location yet still tend to rotate, or resist rotation while experiencing an unbalanced force. Both conditions are needed when evaluating static equilibrium.
Motion begins when conditions that supported equilibrium change, producing an unbalanced force, an unbalanced torque, or both. A changed load, altered support, or other change in the system can therefore initiate translation or rotation. Identifying which equilibrium condition fails helps explain not only that motion begins, but also the type of instability involved.
They first specify the reference frame and the system being examined, then consider the forces acting on the object and whether they balance. For systems that could rotate, they also evaluate the net torque. This approach can determine support forces and reveal whether a book, bridge, or parked vehicle satisfies the conditions required for stability.
Engineers apply static-equilibrium reasoning to structures carrying loads, such as bridges. Balancing the relevant forces helps predict how supports respond, while checking torque helps assess rotational stability. These results contribute to structural-safety judgments by showing whether the system can remain stable under its stated loading conditions rather than beginning to move.
These familiar systems illustrate how equilibrium analysis connects observable stability with underlying support forces. A book on a table and a parked vehicle can be examined to determine whether forces balance and, where rotation is possible, whether torque also balances. The same reasoning extends from simple examples to larger systems under load.