Applied Force
Applied Force - Related Videos
05:58
Using DNA-Based Tension Probes to Assess Receptor Forces Applied by Immune Cells
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2025
The video demonstrates a method for assessing receptor forces applied by immune cells using polyethylene glycol-anchored gold nanoparticles and DNA hairpin tension probes. CD8-positive T cell interactions trigger probe unfolding, emitting fluorescence while locking strands sustain the signal for quantifying the forces applied by immune cells.
10:55
Extracting the Young's Modulus of Native Murine Pulmonary Basement Membranes from Atomic Force Microscopy Derived Force Maps
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2025
This protocol visualizes how to prepare cryosections of murine lung tissue, perform atomic force microscopy force map experiments, and analyze the data to determine Young's modulus of the native murine pulmonary basement membrane.
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...
05:41
Applying Microfluidics to Electrophysiology
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Cited by 1 •
2007
Microfluidics can be integrated with standard electrophysiology techniques to allow new experimental modalities. Specifically, the motivation for the ...
12:31
A Method for Selecting Structure-switching Aptamers Applied to a Colorimetric Gold Nanoparticle Assay
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Cited by 17 •
2015
A protocol is provided to select structure-switching aptamers for small molecule targets based on a tunable stringency magnetic bead selection method. Aptamers selected with structure-switching properties are beneficial for assays that require a conformational change to signal the presence of a target, such as the described gold nanoparticle assay.
FAQs
Direction determines how an applied force contributes to an object's motion: the force must be considered together with its magnitude and the directions of other forces. When the combined force is nonzero, Newton's second law, F = ma, connects that result to acceleration. This lets physics models predict not only whether motion changes, but also how force direction affects the outcome.
Friction and gravity can reduce or oppose the effect of an applied force, so the exerted effort alone does not determine motion. A force analysis must account for these interactions before applying F = ma. This distinction matters in practical calculations because the same applied force can produce different acceleration or support equilibrium depending on which opposing forces act on the object.
Applied force describes the external push or pull being exerted, whereas net force represents the effective force after opposing influences such as friction and gravity are considered. Using the net force in F = ma prevents analysts from attributing all observed acceleration to the applied force alone. This distinction improves predictions of motion and clarifies when a system reaches equilibrium.
Magnitude indicates how large the force is, while direction indicates where its effect is oriented. Treating applied force as a vector preserves both pieces of information in a calculation. This is essential when evaluating an interaction because changing the direction can alter the resulting motion even if the force magnitude remains unchanged. Vector-based analysis therefore supports more accurate predictions.
An effective analysis begins by specifying the applied force's magnitude and direction, then identifying forces that oppose or modify its effect, including friction and gravity. Next, determine whether the net force is zero or nonzero. For a nonzero net force, use F = ma to connect force with acceleration; for zero net force, evaluate the system as an equilibrium case.
Applied force calculations can provide either a predicted acceleration or the effort required to produce a target motion, depending on which quantity is known. The relationship F = ma links force, mass, and acceleration, while opposing forces must be included in the analysis. This makes the approach useful for interpreting laboratory motion and planning physical systems quantitatively.
The concept is used across physics and engineering contexts rather than in one type of experiment. Laboratory carts provide a simple setting for analyzing motion, while machines and structures show how force calculations support design. Biological movement also involves applied-force analysis, extending the same framework to interactions in living systems and helping compare effort, motion, and equilibrium.