How Much Work Must Be Done by Frictional Forces in Slowing

question 109

Multiple Choice

How much work must be done by frictional forces in slowing a 1000-kg car from $26.1 \mathrm {~m} / \mathrm { s }$ to rest?

• A) 3.41 × 10⁵ J
• B) 2.73 × 10⁵ J
• C) 4.09 × 10⁵ J
• D) 4.77 × 10⁵ J

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Definitions:

Experimental Method

A research method involving the manipulation of variables to establish cause-and-effect relationships.

Variable Manipulation

The systematic adjustment or alteration of the independent variables in an experiment to observe their effect on the dependent variables.

Controlled Conditions

A methodological practice in experiments where all variables are kept constant except for the independent variable being tested.

Non-random Assignment

The process of allocating individuals to groups in a study based on criteria other than random selection, potentially introducing bias to the results.