(4) What the surfac In the inc 30° and us A force F direction ( (a) What s block beg friction and (b) When (with P he experiencin (c) What sh

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(4) What is the force that is responsible for causing friction between two surfaces? What are
the surface properties that enhance friction?
In the inclined plane below, the angle of the incline is
30° and us and uk are 0.9 and 0.5, respectively.
N
A force P is applied along the plane in the upward
direction (shown) on the block of mass 10kg.
(a) What should the minimum value of P be so that the
block begins to move up the plane (against static
friction and weight)?
W
30
(b) When the 10 kg block begins to slide up the plane
* Force of Friction is not shown
(with P held constant), it will accelerate, because it is
in diagram.
experiencing a reduced (kinetic uk) friction. What is this value of this acceleration?
(c) What should P be reduced to so that the block will move at constant velocity up the plane?
Transcribed Image Text:00 (4) What is the force that is responsible for causing friction between two surfaces? What are the surface properties that enhance friction? In the inclined plane below, the angle of the incline is 30° and us and uk are 0.9 and 0.5, respectively. N A force P is applied along the plane in the upward direction (shown) on the block of mass 10kg. (a) What should the minimum value of P be so that the block begins to move up the plane (against static friction and weight)? W 30 (b) When the 10 kg block begins to slide up the plane * Force of Friction is not shown (with P held constant), it will accelerate, because it is in diagram. experiencing a reduced (kinetic uk) friction. What is this value of this acceleration? (c) What should P be reduced to so that the block will move at constant velocity up the plane?
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