**Unit 2: Newton's Laws of
Motion**

**Problem Set C**

**Overview:**

Problem Set C targets your understanding of each of Newton's Laws. While the Multiple Choice question targets your conceptual understandings, the 20 problems target your ability to apply the concepts of force, mass and acceleration in order to analyze a variety of physical situations. Compared to Set B, the mathematical rigor of Set C is mild. There are at least six skills or conceptual understandings which you must have to be successful on Problem Set C. They include:

- an understanding of the distinction between mass and weight and the ability to determine one if given the other.
- an understanding that the acceleration of an object which is moving with a constant velocity is 0 m/s/s. Regardless of the actual velocity value, if it is constant, then there is an acceleration of 0 m/s/s.
- an ability to read a verbal description of a physical situation and to represent that situation in terms of the individual forces acting in the situation. This ability is most commonly referred to as the ability to construct a free-body diagram. An understanding of the various force types is essential to the task of drawing a free-body diagram.
- an ability to use Newton's second law equation and the concept of net force in order to read and interpret a word story problem and to determine the acceleration of an object from stated values of the individual forces.
- an ability to use Newton's second law equation and the concept of net force in order to read and interpret a word story problem and to determine the unknown value of an individual force if given mass and acceleration information.
- an understanding of the relationship between friction force
and the coefficient of friction and the ability to use the
equation F
_{frict}= mu • F_{norm}to determine one value from the other.

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