A ball tossed upward will return to the same point with the...

Name: Problem 73, Chapter 3: Conceptual Physics
Uploaded: 2019-08-30T19:19:22-08:00
Duration: 59 s
Channel: Kara Merfeld
Description: A ball tossed upward will return to the same point with the same initial speed when air resistance is negligible. When air resistance is not negligible, how does the return speed compare with its initial speed?

A ball tossed upward will return to the same point with the same initial speed when air resistance is negligible. When air resistance is not negligible, how does the return speed compare with its initial speed?

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Key Concepts

Non-conservative Forces

Non-conservative forces, such as air resistance, are forces that dissipate energy from a system, often in the form of heat. Unlike conservative forces, which conserve mechanical energy, non-conservative forces remove energy from the system, meaning that the total mechanical energy (kinetic + potential) is reduced over time.

Energy Dissipation

Energy dissipation refers to the process by which energy is lost from a mechanical system, often due to non-conservative forces like air resistance. When an object is moving through a medium like air, some of its initial kinetic energy is converted to other forms of energy, such as thermal energy, which results in the object returning with a lower speed than it initially had.

Air Resistance

Air resistance is a force that opposes the motion of an object through the air. It acts in the opposite direction to the object's velocity and increases with speed. In the context of projectile motion, air resistance works against the movement both upward and downward, causing a reduction in the object’s kinetic energy during its flight.

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