Seesaw Problem
Seesaw Problem - Related Videos
02:27
Predicting Molecular Geometry
0 Views •
2020
VSEPR Theory for Determination of Electron Pair Geometries The following procedure uses VSEPR theory to determine the electron pair geometries and the molecular structures: Write the Lewis structure of the molecule or polyatomic ion. Count the number of electron groups (lone pairs and bonds) around the central atom. A single, double, or triple bond counts as one region of electron density. Identify the electron-pair geometry based on the number of electron groups: linear, trigonal planar,...
04:01
VSEPR Theory and the Effect of Lone Pairs
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2020
Effect of Lone Pairs of Electrons on Molecule Geometry It is important to note that electron-pair geometry around a central atom is not the same thing as its molecular structure. Molecular structure describes the location of the atoms, not the electrons. The geometry that includes all electron pairs is the electron-pair geometry. The electron-pair geometries describe all regions where electrons are located, bonds as well as lone pairs. The structure that includes only the placement of the...
08:19
Tracking Morphogenetic Tissue Deformations in the Early Chick Embryo
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Cited by 11 •
2011
This article describes surface labeling and ex ovo tissue culture in the early chick embryo. Techniques amenable to time-lapse bright field, fluorescence, and optical coherence tomography imaging are presented. Tracking surface labels with high spatiotemporal resolution enables kinematic quantities such as morphogenetic strains (deformations) to be calculated in both two and three dimensions.
11:48
Generation, Amplification, and Titration of Recombinant Respiratory Syncytial Viruses
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Cited by 12 •
2019
We describe a method for generating and amplifying genetically modified respiratory syncytial viruses (RSVs) and an optimized plaque assay for RSVs. We illustrate this protocol by creating two recombinant viruses that respectively allow quantification of RSV replication and live analysis of RSV inclusion bodies and inclusion bodies-associated granules dynamics.
12:20
Preparation of Segmented Microtubules to Study Motions Driven by the Disassembling Microtubule Ends
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Cited by 24 •
2014
Microtubules are inherently unstable polymers, and their switching between growth and shortening is stochastic and difficult to control. Here we describe protocols using segmented microtubules with photoablatable stabilizing caps. Depolymerization of segmented microtubules can be triggered with high temporal and spatial resolution, thereby assisting analysis of motions with the disassembling microtubule ends.
FAQs
Torque is found by multiplying the force by its perpendicular distance from the pivot. In a seesaw problem, that force commonly comes from gravitational force associated with a mass. The distance acts as the lever arm, so changing either the applied force or its position changes the turning effect and can alter whether the beam rotates or remains balanced.
The pivot determines the lever-arm length for every force acting on the beam. A force applied farther from the fulcrum produces a greater torque than the same force applied closer to it. Consequently, a mass can balance another mass without being equal to it, provided the clockwise and counterclockwise turning effects match.
Mechanical advantage appears when lever-arm length allows a smaller force to balance a larger force. Placing the smaller force farther from the pivot increases its torque, while positioning the larger force nearer the pivot reduces its turning effect. This relationship connects mass, gravitational force, and position in a direct equilibrium calculation.
A free-body diagram organizes the forces acting on the beam and shows their locations relative to the fulcrum. It helps distinguish the forces producing clockwise torque from those producing counterclockwise torque. Using that diagram, a solver can identify the relevant masses, gravitational forces, and distances before applying the equilibrium condition.
First identify the pivot, the forces, and each force’s perpendicular distance from the pivot. Next determine which forces create clockwise and counterclockwise torques. Calculate each torque using force multiplied by lever-arm length, then set the opposing torques equal for balance. Finally, solve for the unknown mass, position, or force represented in the problem.
A seesaw calculation can determine an unknown mass, force, or location when the remaining quantities are known. It also shows whether a proposed arrangement satisfies rotational equilibrium. In physics, this makes the model useful for practicing statics and for understanding how lever-arm placement supports the operation and design of simple machines.