Un auto circula a gran rapidez por una autopista cuando el...

Name: Problem 112, Chapter 6: Física Universitaria Volumen 1
Uploaded: 2020-07-08T07:45:31-08:00
Duration: 1 min 59 s
Channel: Zulfiqar Ali
Description: Un auto circula a gran rapidez por una autopista cuando el conductor frena de emergencia. Las ruedas se bloquean (dejan de rodar), y las marcas de derrape tienen una longitud de 32,0 metros. Si el coeficiente de fricción cinética entre los neumáticos y la carretera es de 0,550, y la aceleración fue constante durante el frenado, ¿a qué velocidad iba el auto cuando se bloquearon las ruedas?

Un auto circula a gran rapidez por una autopista cuando el conductor frena de emergencia. Las ruedas se bloquean (dejan de rodar), y las marcas de derrape tienen una longitud de 32,0 metros. Si el coeficiente de fricción cinética entre los neumáticos y la carretera es de 0,550, y la aceleración fue constante durante el frenado, ¿a qué velocidad iba el auto cuando se bloquearon las ruedas?

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Key Concepts

Uniformly Accelerated Motion

This concept relates to motions where the acceleration is constant throughout the journey. In the context of braking, kinematic equations (such as v² = v?² + 2a?x) are applied to establish relationships between initial velocity, acceleration (or deceleration), and stopping distance. Understanding these relationships is crucial to solving problems involving sudden changes in speed.

Kinetic Friction

Kinetic friction arises between two surfaces in relative motion and is characterized by a specific coefficient. In braking scenarios, the kinetic friction between the tires and the road provides the force necessary for deceleration. The friction force is proportional to the normal force, typically expressed as F = ??N, where ?? is the coefficient of kinetic friction.

Frictional Deceleration

Frictional deceleration is the process by which friction opposes the motion of a moving object, reducing its speed. When brakes are applied and wheels lock, the deceleration experienced by the vehicle is due to the force of friction acting against the motion. This deceleration is mathematically linked to both the coefficient of kinetic friction and the gravitational acceleration.

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