Translational Kinetic Energy
Translational Kinetic Energy - Related Videos
00:23
Kinetic Energy
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2019
Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
03:07
Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy
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2020
The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws. Collectively, the molecules in a sample of gas have average kinetic energy and average speed; but individually, they move at different speeds. Molecules frequently undergo elastic collisions in which the momentum is conserved. Since the colliding molecules are deflected off at different...
01:18
Kinetic Energy - I
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2023
It’s plausible to suppose that the greater the velocity of a body, the greater effect it could have on other bodies. This does not depend on the direction of the velocity, only its magnitude. At the end of the seventeenth century, a quantity was introduced into mechanics to explain collisions between two perfectly elastic bodies, in which one body makes a head-on collision with an identical body at rest. When they collide, the first body stops, and the second body moves off with the initial...
00:56
Kinetic Energy - II
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2023
The kinetic energy of a particle is one-half of the product of the particle’s mass and the square of its speed. Note that just as Newton’s second law can be expressed as either the rate of change of momentum or mass multiplied by the rate of change of velocity, so too can the kinetic energy of a particle be expressed in terms of its mass and momentum, instead of its mass and velocity. In the equation, the units of kinetic energy are mass times the speed-squared, or Note that the units of...
01:21
Molecular Kinetic Energy
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2023
The word "gas" comes from the Flemish word meaning "chaos," first used to describe vapors by the chemist J. B. van Helmont. Consider a container filled with gas, with a continuous and random motion of molecules. During collisions, the velocity component parallel to the wall is unchanged, and the component perpendicular to the wall reverses direction but does not change in magnitude. If the molecule’s velocity changes in the x-direction, then its momentum is changed. During the short time of the...
FAQs
The squared-speed term makes translational kinetic energy especially sensitive to changes in motion. If mass stays constant, doubling speed produces four times the energy, whereas doubling mass at the same speed only doubles it. This relationship helps physicists compare how changes in vehicle speed, projectile motion, or another moving object affect energy available for transfer or conversion.
An object can translate, rotate, or do both, so its motion may contain distinct energy contributions. Translational kinetic energy describes movement of the center of mass, while rotational energy describes spinning about an axis. Separating them allows a complex motion to be analyzed more clearly, particularly when studying objects whose overall movement and rotation produce different physical effects.
Net work changes an object's translational kinetic energy. When forces perform positive net work, the object's kinetic energy increases; when the net work is negative, it decreases. This provides a practical way to connect forces with changes in motion without analyzing every detail of the path, making it useful for evaluating acceleration, slowing, and energy conversion.
For each object, determine its mass and speed before or after the collision, then evaluate one-half times mass times speed squared. Comparing those values shows how translational energy changes and supports analysis of energy transfer between bodies. Momentum transfer remains a related part of the collision description, so kinetic energy is one measure rather than the entire analysis.
Vehicle analysis uses the strong dependence of kinetic energy on speed to assess how much motion-related energy must be reduced during stopping. Because speed is squared in the calculation, a faster vehicle has disproportionately more translational kinetic energy than a slower vehicle of the same mass. This makes the concept useful for comparing stopping demands and energy changes.
For a projectile, the calculation tracks the energy associated with its translational motion as its speed changes. In a system of particles, focusing on the center of mass provides a way to describe the system's overall translation while distinguishing internal or rotational behavior. These applications help connect individual motions with the motion of the system as a whole.