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Wedges-Learning Goal

Sandra Watson
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The crate shown is held against wedge B by a spring. The spring is 94.5% of its original uncompressed length l=2.75m, and the spring constant is given as k=1650N/m. The coefficient of static friction at all contacting surfaces is μs=0.120. The mass of the crate is m=23.0kg. The angle is θ=13.0∘ . Neglect the mass of the wedge. Assume the crate only moves in the y-direction and that wedge A cannot move.

y L. P A

Determine the normal force NC that the crate exerts on the wedge when the system is at rest.

Determine the magnitude of the smallest horizontal force P that is necessary to begin moving the crate upward.

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