Momentum Exchange
Momentum Exchange - Related Videos
09:33
Angular Momentum
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2023
Source: Nicholas Timmons, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Angular momentum is defined as the product of the moment of inertia and the angular velocity of the object. Like its linear analog, angular momentum is conserved, meaning that the total angular momentum of a system will not change if there are no external torques on the system. A torque is the rotational equivalent of a force. Because it is a...
09:46
Conservation of Momentum
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2023
Source: Nicholas Timmons, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA The goal of this experiment is to test the concept of the conservation of momentum. By setting up a surface with very little friction, collisions between moving objects can be studied, including their initial and final momenta. The conservation of momentum is one of the most important laws in physics. When something is conserved in physics, the...
11:38
Heat Exchanger Analysis
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2023
Source: Alexander S Rattner and Christopher J Greer; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Heat exchangers transfer thermal energy between two fluid streams, and are ubiquitous in energy systems. Common applications include car radiators (heat transfer from hot engine coolant to surrounding air), refrigerator evaporators (air inside refrigerator compartment to evaporating refrigerant), and cooling towers in power plants...
02:06
Social Exchange Theory
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2020
We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003). People are motivated to maximize the benefits...
01:20
Gas Exchange and Transport
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2019
Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them. When the...
FAQs
Impulse connects the change in an object's momentum to the force applied over a time interval. When engineers determine how much momentum changes and how long the interaction lasts, they can estimate the average force responsible. This relationship is especially useful for evaluating short-duration events, such as impacts, where peak behavior may be difficult to measure directly.
Momentum conservation applies to an isolated system, so engineers must decide which objects or fluid regions belong inside the analysis boundary. Interactions within that boundary can redistribute momentum without changing the system total, whereas external forces can alter it. Choosing the boundary correctly helps distinguish internal exchanges from outside influences and prevents incomplete force analyses.
Several interaction types can change motion: direct contact forces, collisions, pressure differences, and exchanges involving fluid regions. Their physical details differ, but each can transfer momentum and modify velocity. Recognizing the dominant interaction helps engineers select an appropriate model for an impact, a moving fluid, a machine component, or another dynamic system.
Pressure differences drive momentum transfer between neighboring fluid regions and can change the motion of the flow. Engineers examine how these pressure effects alter fluid behavior across a selected region, rather than focusing only on individual particles. This approach supports analysis of fluid systems and links local pressure conditions to larger changes in flow motion.
First, engineers identify the objects or fluid region being analyzed and establish the relevant initial and final motion. They then determine the resulting change in momentum and relate it to the time over which the interaction occurs. The resulting impulse and average force provide a practical description of the dynamic event for design or evaluation.
For impacts, engineers analyze how momentum changes during contact to estimate the resulting impulse and average force. That information helps characterize impact loads and assess how a vehicle or component responds to a collision. In vehicle safety work, the analysis supports designs intended to manage dynamic events and reduce unsafe force effects.
Propulsion systems can be examined by tracking how momentum is transferred through moving mass, while machinery analysis considers exchanges between interacting components. The same framework helps predict how motion changes when forces or transfers act over time. Engineers use these results to evaluate system response, improve mass-transfer efficiency, and understand dynamic behavior in operating equipment.