Physics 163

Unit 2: Newton's Laws of Motion

Problem Set C

Problem #19:

A 1378-kg car is skidding to a stop along a horizontal surface. The car decelerates from 34.2 m/s to a rest position in 3.99 seconds. Assuming negligible air resistance, determine the coefficient of friction between the car tires and the road surface. Enter a positive value that is accurate to the third decimal place. (If necessary, review the definition of and the equation for computing the acceleration.)

• Read the problem carefully and diagram the physical situation (free-body diagram)
• Identify known and unknown information in an organized manner (list on diagram)
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Information about the relationship between acceleration, velocity change, and time is available at The Physics Classroom.

The task of determining an individual force value if given mass and acceleration information is discussed in detail at The Physics Classroom.

The relationship between the coefficient of friction and force of friction is discussed in detail at The Physics Classroom.

The relationship between mass and the force of gravity is discussed in detail at The Physics Classroom.

The task of constructing a free-body diagram for a physical situation is discussed in detail at The Physics Classroom.

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