A 4-Kg Block Is Connected by Means of a Massless

question 81

Multiple Choice

A 4-kg block is connected by means of a massless rope to a 2-kg block as shown in the figure.Complete the following statement: If the 4-kg block is to begin sliding, the coefficient of static friction between the 4-kg block and the surface must be

• A)less than zero.
• B)greater than 2.
• C)greater than 1, but less than 2.
• D)greater than 0.5, but less than 1.
• E)less than 0.5, but greater than zero.

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Definitions:

Dependent Variable

The variable in experimental research that is expected to change as a result of manipulations to the independent variable.

Control Variable

A factor that is kept constant to accurately test the impact of an independent variable on a dependent variable in an experiment.

Placebo

A harmless substance with no therapeutic effect, used in controlled experiments to test the efficacy of treatments.

Control Group

In experimental research, a group of subjects who do not receive the treatment being tested, used as a benchmark to measure the effect of the treatment.