A Mass Attached to the End of a Spring Is $\overrightarrow { \mathbf { F } } _ { sp } \cdot d~ \overrightarrow { \mathbf { x } }$

question 34

Multiple Choice

A mass attached to the end of a spring is pulled out and released on a surface with friction.The work $\overrightarrow { \mathbf { F } } _ { sp } \cdot d~ \overrightarrow { \mathbf { x } }$ done on the mass by the force exerted by the spring

• A)never has the same sign as the change in energy owing to friction.
• B)always has the same sign as the change in energy owing to friction.
• C)has the same sign as the change in energy owing to friction during one half of each cycle.
• D)never has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force.
• E)always has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force.

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