A block slides down a frictionless plane that makes an angle of 30 
with the horizontal. The acceleration of the block (in cm/s2) is:
Definitions:
Main Effect
The direct impact of an independent variable on a dependent variable in an experimental design.
Null Hypothesis
A default hypothesis that there is no effect or no difference, and any observed difference is due to sampling or experimental error.
Interaction Effect
A phenomenon in which the effect of one independent variable on the dependent variable varies depending on the level of another independent variable.
Interaction Effect
In statistical analysis, refers to a situation where the effect of one independent variable on the dependent variable is different at various levels of another independent variable.
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