Solution Found!
A 50-cm × 30-cm × 20-cm block weighing 150 N is to be
Chapter 2, Problem 70P(choose chapter or problem)
Problem 70P
A 50-cm × 30-cm × 20-cm block weighing 150 N is to be moved at a constant velocity of 0.8 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direction. (b) If a 0.4-mm-thick oil film with a dynamic viscosity of 0.012 Pa • s is applied between the block and inclined surface, determine the percent reduction in the required force.
Questions & Answers
QUESTION:
Problem 70P
A 50-cm × 30-cm × 20-cm block weighing 150 N is to be moved at a constant velocity of 0.8 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direction. (b) If a 0.4-mm-thick oil film with a dynamic viscosity of 0.012 Pa • s is applied between the block and inclined surface, determine the percent reduction in the required force.
ANSWER:
Step 1
Using the component of the forces along the inclined plane and perpendicular to the inclined plane we will calculate the force required to maintain the constant speed.
Then we have to calculate the reduced force after a oil film is applied between the block surface and inclined surface.