The Center of Mass of a System of Particles Remains

question 49

Multiple Choice

The center of mass of a system of particles remains at the same place if:

• A)it is initially at rest and the external forces sum to zero
• B)it is initially at rest and the internal forces sum to zero
• C)the sum of the external forces is less than the maximum force of static friction
• D)no friction acts internally
• E)none of the above

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Definitions:

Median

The middle value of a dataset, which divides the dataset into two halves when the numbers are arranged in ascending order.

1st Quartile

The 1st quartile, also known as the lower quartile, is a statistical measure that divides the lowest 25% of data in a dataset from the highest 75%.

3rd Quartile

The value below which 75% of the data in a dataset falls, marking the upper quartile in a distribution of values.

Negatively Skewed Distribution

A distribution where the tail on the left side of the probability density function is longer or fatter than the right side.