The viscosity equation states that pressure decreases in the direction of flow, while Bernoulli's equation (for no height change) states that pressure decreases in the direction of flow if and only if the fluid speeds up. Explain each of these statements using Newton's second law and the laws of fluids.

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The viscosity equation states that pressure decreases in the direction of flow, while Bernoulli's equation (for no height change) states that pressure decreases in the direction of flow if and only if the fluid speeds up. Explain each of these statements using Newton's second law and the laws of fluids.

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