Composite Objects
Composite Objects - Related Videos
06:26
Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method
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Cited by 3 •
2017
A protocol to expose bare fibers on the composite surface by eliminating resin rich area is presented. The fibers are exposed during fabrication of the composites, not by the post surface treatment. The exposed carbon composites exhibit high electrical conductivity in the through-thickness direction and high mechanical property.
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.
10:14
Object Substitution Masking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Visual masking is a term used by perceptual scientists to refer to a wide range of phenomena in which in an image is presented but not perceived by an observer because of the presentation of a second image. There are several different kinds of masking, many of them relatively intuitive and unsurprising. But one surprising and important type of masking is called Object Substitution Masking. It has been a focus of research in vision...
05:55
Multiple Object Tracking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In a staggeringly complex and engaging world, it is crucial to selectively process some stimuli at the expense of others. Experimental psychologists call this ability attention. Specifically, visual attention refers to the ability to selectively process aspects of a visual scene. Many paradigms used to study visual attention involve brief, punctuated, and repeated trials. However, everyday situations often place sustained demands...
03:35
Classifying Matter by Composition
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2020
Matter: Pure Substances and Mixtures According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. A mixture is composed of two or more types of...
FAQs
External and internal forces play different analytical roles. The net external force determines the acceleration of a composite object's center of mass, so the system can translate even when individual parts move relative to one another. Internal forces, by contrast, act between components and may alter their separation, orientation, or deformation without directly determining the center-of-mass acceleration. This distinction separates overall motion from component-level behavior.
Mass distribution affects how motion is represented because the center of mass summarizes translational behavior, while the arrangement of mass among connected parts influences rotation and deformation. Two systems can therefore share a similar overall translation yet display different component motions. Accounting for distribution helps explain why a single-body model may not capture all observed behavior.
Conservation of momentum provides a way to relate the motion of components before and after a collision, while conservation of angular momentum addresses rotational behavior. The analyst can treat the connected system collectively or track separate parts, depending on the question. These principles are especially useful when a collision changes relative motion, rotation, or the distribution of motion among components.
A free-body diagram organizes the forces acting on a selected body or component. For a whole system, it highlights external forces; for an individual part, it can also show interactions with neighboring components. Drawing the diagram at the chosen level prevents internal forces from being confused with external ones and clarifies whether the goal is overall acceleration or component motion.
First identify whether the system should be treated as a whole, as separate components, or at both levels. Next represent relevant forces with free-body diagrams and locate the center of mass. Then apply force-based motion analysis together with momentum or angular-momentum conservation when appropriate. Finally compare overall translation with relative motion, rotation, or deformation to interpret the system's behavior.
A whole-system model is useful for determining center-of-mass motion and the effect of external forces. A component model becomes more informative when internal forces produce deformation, rotation, or changes in relative motion. Switching between these descriptions connects the system's global behavior with the details of linked or interacting parts, which is important when one level alone leaves the mechanism unresolved.
This framework supports the study of collisions, linked mechanisms, rigid-body motion, structural stability, and engineered devices. In each case, analyzing only one part can miss how forces and mass distribution shape the behavior of the complete system. The approach therefore helps connect measurable overall motion with internal interactions and component responses in systems designed or studied as integrated devices.