What does it mean when it said the relative velocity is the difference between the object's absolute velocity and the fluid's absolute velocity?
Thank you
Thank you
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Suppose there is a glass-pipe (so we can see) with water constantly flowing through it. Also, suppose there is an object (for example, a fish, gum, a bean etc) in the water flowing with the water.
Absolute velocity means relative to the observer. For example, if we are looking at the glass-pipe and measure the fluid or gum's velocity, then we call that "Absolute Velocity."
For example:
V_water_flow = 50 m/s (<-- this velocity is absolute to the observer)
V_gum_in_Water = 30 m/s (<-- this (object) is absolute to the observer)
Relative velocity = 30 - 50 = - 20 m/s (<-- This is the difference)
Note: If we were water molecules, we would see the gum passing us in the opposite direction at 20 m/s. In other words, if water was flowing in the right, the molecules would see the gum moving to the left
Hope this helps.
Absolute velocity means relative to the observer. For example, if we are looking at the glass-pipe and measure the fluid or gum's velocity, then we call that "Absolute Velocity."
For example:
V_water_flow = 50 m/s (<-- this velocity is absolute to the observer)
V_gum_in_Water = 30 m/s (<-- this (object) is absolute to the observer)
Relative velocity = 30 - 50 = - 20 m/s (<-- This is the difference)
Note: If we were water molecules, we would see the gum passing us in the opposite direction at 20 m/s. In other words, if water was flowing in the right, the molecules would see the gum moving to the left
Hope this helps.