Justify your observation 3 2 points Compared with the maximum value of the

# Justify your observation 3 2 points compared with the

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The force of kinetic friction as function of θ increase, decreases or remains the same. Justify your observation. ____________________________________________________ ________________________________________________________________________ 3. (2 points) Compared with the maximum value of the force of static friction you calculated in part 1 the force of kinetic friction is larger, smaller or the same? Explain your observation. ________________________________________________________________________ _______________________________________________________________________ Pre-lab Question: 1. Consider a block sliding down an inclined plane at an angle θ with the horizontal. If the plane is inclined such that the block is just about to slide down, complete the F.B.D to show all the component of forces along the x and y direction. Apply Newton’s 2 nd law along the x and y direction and show that at the threshold of motion tan θ = µ s. (5 Points) At equilibrium, ΣF x = 0 For suggestions or changes contact [email protected] motion Motion 4 At equilibrium, ΣF y = 0 (5 points) Complete the algebra to prove that tan θ = µ s . Note: By measuring the tan , the coefficient of static friction, when the objet just begins to slide can be determined. 2. (5 Points) (Phy235) If the angle of the incline is such that the object slides down with a constant acceleration a , a) Draw the F.B.D to show all the component of forces along the x and y direction. b) Apply Newton’s 2 nd law along the x and y direction. At equilibrium, Σ F x = ma x At equilibrium, ΣF y = 0 (5 Points) Complete the algebra to prove that µ k as function of θ and the acceleration a is given by µ k = [g sin (θ) – a ] For suggestions or changes contact [email protected] 5 g cos (θ) For suggestions or changes contact [email protected] #### You've reached the end of your free preview.

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• Winter '13
• Libley
• • •  