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ws21 - Worksheet 21 Fluid Dynamics Questions 1 Particles...

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Worksheet 21: Fluid Dynamics Questions 1. Particles travel through a straight tube. (a) The speed of particles at A is the same as particles at B . There was a difference in speed, particles would bunch up between the two points (if v A > v B ) or would evacuate the area between A and B (if v B > v A ), which does not happen. (b) The pressures are the same also, because if there was a difference in pressure, there would be an acceleration and a change in speed in the particles, which does not happen. 2. Particles travel through a funnel. (a) The speed at A is slower than the speed at B . This is because the same volume of water must pass through both points, and in order for that to happen, water must travel faster through B to keep up with the supply coming through A . (b) The pressure at B is less than the pressure at A . The reason is particles are accelerating (increasing speed) going from A to B , so there must be a difference in pressure to cause this acceleration (force) on the particles.
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