Question

Assessment: The following two exercises will allow you to synthesize your knowledge of what we just learned about friction with what you already know about free body diagrams, Newton’s second law, and kinematics equations: 1. You, with m =75 kg, have just come down a ski slope and are traveling at 18 m/s. You continue to slide on the flat terrain being slowed by frictional forces. It takes 7.3 s for you to come to a stop. (a) Draw a scaled force diagram showing and naming all the forces acting on you as you slide. [Handwritten diagram showing forces N, f, W and acceleration a] (b) Calculate the value of your acceleration, and also determine, using variables, how the acceleration is connected to the coefficient of kinetic friction – then calculate the coefficient. a = -f/m = -?N/m = -?mg/m = -?g a = -?g ? = -a/g (c) Calculate the distance you slide before coming to a stop. u = 18 m/s V = 0 t = 7.3 V^2 = u^2 + 2as 0 = (18)^2 - 2(?g)s s = 324 / (2 * 9.8?) s = 16.53/? m

          Assessment:

The following two exercises will allow you to synthesize your knowledge of what we just learned about friction with what you already know about free body diagrams, Newton’s second law, and kinematics equations:

1. You, with m =75 kg, have just come down a ski slope and are traveling at 18 m/s. You continue to slide on the flat terrain being slowed by frictional forces. It takes 7.3 s for you to come to a stop.
(a) Draw a scaled force diagram showing and naming all the forces acting on you as you slide.
[Handwritten diagram showing forces N, f, W and acceleration a]

(b) Calculate the value of your acceleration, and also determine, using variables, how the acceleration is connected to the coefficient of kinetic friction – then calculate the coefficient.
a = -f/m = -?N/m = -?mg/m = -?g
a = -?g
? = -a/g

(c) Calculate the distance you slide before coming to a stop.
u = 18 m/s V = 0 t = 7.3
V^2 = u^2 + 2as
0 = (18)^2 - 2(?g)s
s = 324 / (2 * 9.8?)
s = 16.53/? m

Assessment:

The following two exercises will allow you to synthesize your knowledge of what we just learned about friction with what you already know about free body diagrams, Newton’s second law, and kinematics equations:

1. You, with m =75 kg, have just come down a ski slope and are traveling at 18 m/s. You continue to slide on the flat terrain being slowed by frictional forces. It takes 7.3 s for you to come to a stop.
(a) Draw a scaled force diagram showing and naming all the forces acting on you as you slide.
[Handwritten diagram showing forces N, f, W and acceleration a]

(b) Calculate the value of your acceleration, and also determine, using variables, how the acceleration is connected to the coefficient of kinetic friction – then calculate the coefficient.
a = -f/m = -?N/m = -?mg/m = -?g
a = -?g
? = -a/g

(c) Calculate the distance you slide before coming to a stop.
u = 18 m/s V = 0 t = 7.3
V^2 = u^2 + 2as
0 = (18)^2 - 2(?g)s
s = 324 / (2 * 9.8?)
s = 16.53/? m

Added by Elizabeth C.

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