Physics Forces
Physics Forces - Related Videos
02:56
Intermolecular Forces and Physical Properties
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2025
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. For example, a high-boiling-point liquid, like water (H2O, b.p. 100 °C), exhibits stronger intermolecular forces compared to a low-boiling-point liquid, like hexane (C6H14, b.p. 68.73 °C). The three kinds of intermolecular interactions include i) ion–dipole forces, ii) dipole–dipole interactions,...
06:33
Probing the Roles of Physical Forces in Early Chick Embryonic Morphogenesis
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Cited by 1 •
2018
Here, we present a protocol introducing a set of new ex-ovo experiments and physical modeling approaches for studying the mechanics of morphogenesis during early chick embryonic brain torsion.
08:00
Force and Acceleration
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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 understand the components of force and their relation to motion through the use of Newton's second law by measuring the acceleration of a glider being acted upon by a force. Nearly every aspect of motion in everyday life can be described using Isaac Newton's three laws of motion. They describe how objects in...
02:36
Electromotive Force
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2020
Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
10:15
Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Cited by 34 •
2015
We describe a protocol for preparation of supported lipid bilayers and its characterization using atomic force microscopy and force spectroscopy.
FAQs
Engineers combine the magnitudes and directions of individual forces to determine the net force acting on an object or structure. This prevents separate loads from being considered in isolation and supports predictions of motion, equilibrium, or deformation. The resulting force analysis helps connect measured or expected loads with the behavior of a designed system.
The distinction identifies how an interaction enters an engineering model. Contact forces act through physical interaction between bodies, while forces at a distance do not require direct contact. Recognizing the difference helps engineers represent the relevant interactions before combining forces, evaluating equilibrium, or predicting how a component will respond under operating conditions.
For a given net force, Newton’s second law links acceleration to mass: increasing mass reduces the predicted acceleration, while decreasing mass increases it. Engineers use this relationship when evaluating motion in vehicles, machines, and other systems. It also helps connect force requirements with performance targets and the expected response of a component.
A free-body diagram organizes the forces acting on a selected object or component so engineers can examine their magnitudes and directions together. It provides a visual starting point for vector addition and net-force calculations. In structural and mechanical analysis, this representation supports predictions of loads, motion, equilibrium, and stability.
An engineering analysis begins by identifying the object or system of interest and representing the relevant forces with a free-body diagram. Engineers then combine the force vectors, determine the net force, and apply an appropriate material or structural model. The results can be used to predict motion, stress, deformation, or stability before testing.
Force analysis does not stop at calculating acceleration. Material and structural models connect applied loads to how a component or structure carries force, including the stresses produced within it. This broader analysis allows engineers to assess deformation and stability as well as motion, which is essential when designing systems that must remain safe and reliable.
Force principles guide the design and testing of bridges, machines, vehicles, and control systems. Engineers use them to predict loads, stresses, motion, and stability, then compare those predictions with system behavior during testing. This process supports safer designs, improved efficiency, and greater reliability across both structural and dynamic applications.