Motion Dynamics
Motion Dynamics - Related Videos
01:30
Dynamics of Circular Motion
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2023
An object undergoing circular motion, like a race car, is accelerating because it is changing the direction of its velocity. This centrally directed acceleration is called centripetal acceleration. This acceleration acts along the radius of the curved path (thus is also referred to as radial acceleration). Any acceleration must be produced by some force. Therefore, any force or combination of forces can cause centripetal acceleration. A few examples include the tension in the rope on a...
01:17
Dynamics Of Circular Motion: Applications
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2023
Suppose a car moves on flat ground and turns to the left. The centripetal force causing the car to turn in a circular path is due to friction between the tires and the road. For this, a minimum coefficient of friction is needed, or the car will move in a larger-radius curve and leave the roadway. Let's now consider banked curves, where the slope of the road helps in negotiating the curve. The greater the angle of the curve, the faster one can take the curve. It is common for race tracks for...
12:03
Dynamics of Structures
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA It is rare nowadays that a whole year goes by without a major earthquake event wreaking havoc somewhere around the world. In some cases, like the 2005 Banda Ache earthquake in Indonesia, the damage involved large geographic areas and casualties in the six figures. In general, the number and intensity of earthquakes is not increasing, however, the vulnerability of the built environment is...
09:32
Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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Cited by 3 •
2018
During landing, lower-body bones experience large mechanical loads and are deformed. It is essential to measure bone deformation to better understand the mechanisms of bone stress injuries associated with impacts. A novel approach integrating subject-specific musculoskeletal modeling and finite element analysis is used to measure tibial strain during dynamic movements.
11:41
Kinematics and Projectile Motion
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2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA This experiment demonstrates the kinematics of motion in 1 and 2 dimensions. This lab will begin by studying motion in 1 dimension, under constant acceleration, by launching a projectile directly upward and measuring the maximum height reached. This lab will verify that the maximum height reached is consistent with the kinematic...
FAQs
Net force combines the forces and interactions acting on an object, including contributions such as friction and gravity. Newton’s second law then relates that net force to acceleration through F = ma, so changing either the interaction forces or the object’s mass changes the predicted acceleration. This provides a quantitative basis for modeling trajectories and mechanical systems.
Momentum provides a way to describe motion during collisions, while energy helps track motion under changing physical conditions. They address different analytical needs: momentum emphasizes the motion of interacting objects, whereas energy supports assessment of how motion changes within a system. Using both can produce a more complete model of collisions and other mechanical events.
Friction and gravity contribute differently to the interactions that determine an object's motion. Friction can modify how motion proceeds, while gravity influences trajectories and the behavior of objects in mechanical or astronomical systems. Including these effects in the force analysis helps researchers move beyond idealized motion and make predictions that better represent physical situations.
A typical analysis identifies the object or system, determines the relevant interactions, and represents their effects through forces such as friction or gravity. Researchers then apply Newton’s laws and, when appropriate, use momentum or energy to examine collisions and changing motion. The resulting equations or model can predict trajectories and support comparison with observed behavior.
Applications include predicting trajectories, analyzing collisions, designing vehicles and machines, and modeling motion in mechanical, biological, and astronomical systems. The same principles can therefore support both controlled engineering problems and the study of complex natural systems. Selecting forces, momentum, or energy as the main analytical tools depends on the motion and interactions being investigated.
Motion Dynamics provides a foundation for extending mechanical analysis to rotational motion and fluid behavior, while also connecting with treatments that involve relativistic or quantum effects. These extensions address situations where the assumptions of basic classical modeling are insufficient. Understanding the classical relationships among force, motion, momentum, and energy helps place those advanced descriptions in context.