Sample Problem

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Sample Problem

Package of tamale slides along a floor with speed . It then runs into and compresses a spring, until the package momentarily stops.

SOLUTION: A starting Key Idea is to examine all the forces acting on the package, and then to determine whether we have an isolated system or a system on which an external force is doing work.

System: The package spring-floor-wall system includes all these forces and energy transfers in one isolated system. Therefore, a second Key Idea is that, because the system is isolated, its total energy cannot change.

A package slides across a frictionless floor with velocity VI toward a spring of spring constant k. When the package reaches the spring, a frictional force from the floor acts on it.

A package slides across a friction less
floor with velocity VI toward a spring of spring constant k.
When the package reaches the spring, a frictional force from the
floor acts on it.

 

 

 

 

 

 

 

 

Rearranging and substituting known data give us

 

 

 

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