Ground reference speed is the speed of an aircraft with reference to the ground. Ground reference can also be used in watercraft by using the seabed. Watercraft can also use water reference speed, which is water flowing past the hull. The difference is that one uses the ground and the other uses the water to reference speed.
The frame of reference for a plane moving at 500 km/h could be relative to the ground or the air. The ground frame of reference would consider the plane's speed relative to the Earth's surface. The air frame of reference would consider the plane's speed relative to the surrounding air.
Air speed is the speed through the air (surprise!) and the air is often moving, you can have a strong tailwind or headwind so that will affect your speed over the ground (groundspeed). The speed through the air might be 500mph, and the groundspeed either 550mph or 450mph, if the wind is at 50mph.
Airspeed is speed with respect to the air, i.e. speed through the air. Groundspeed is speed with respect to the ground, i.e. speed over the ground. It's the vector sum of airspeed and windspeed.
The frame of reference for a plane moving at 500 km/h can be either the ground or the surrounding air. In both cases, the speed of the plane relative to these frames of reference would be 500 km/h.
The frame of reference for a plane moving at 500 km/h is typically Earth's surface. This is because the speed of the plane is measured relative to the ground, which is considered at rest in this context.
YOU HAVE TO BE KIDDN ME RIGHT?
Speed is the relative velocity of a body (such as an athlete) given a frame of reference (such as the ground).
Flee is run from danger. Escape is to free yourself from something, usually a place, but no reference to speed.
The frame of reference for a plane moving at 500 km/h could be relative to the ground or the air. The ground frame of reference would consider the plane's speed relative to the Earth's surface. The air frame of reference would consider the plane's speed relative to the surrounding air.
Air speed is the speed through the air (surprise!) and the air is often moving, you can have a strong tailwind or headwind so that will affect your speed over the ground (groundspeed). The speed through the air might be 500mph, and the groundspeed either 550mph or 450mph, if the wind is at 50mph.
Nothing...
difference between 3 and four speed is, a 3 speed has 3 forward gears. a 4 speed has 4 forward gears
5 speed is faster
An engine PTO runs off the engine thus the speed is governed by the speed of the engine. A ground PTO is ran from the rotation of the tires. Therefore the speed is governed by the speed of the rotation of the tires.
Relative speed is the speed between two moving objects with no regards to a fixed reference. Speed is how fast something is moving with respect to an object.
Speed is what it is: speed. Velocity is speed in a given direction, a vector quantity.
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