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Answered 2009-11-23 04:07:53

That would be vector. It describes the direction and velocity of an object. Rectangular and polar equations.

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What is the scientific meaning of the word velocity?

Speed and direction of an objects motion.


Does velocity changes when the direction of motion changes?

Yes. The velocity changes when the direction of motion changes, because the definition of 'velocity' is 'speed and the direction'. If either speed or direction changes, then we say the velocity has changed. Notice that if the direction changes, then the velocity changes even if the speed doesn't. "Velocity" is not just a bigger word that you use for 'speed' when you want to sound smart. They mean different things.


Acceleration is a change of speed or?

Acceleration is the change in an ogjects speed or a change in an objects direction of motion or both of these. If instead of speed you use the word velocity , which is both an object's speed and its direction of motion, then you could say "acceleration is the change in an objects velocity" and that would cover all the possibilities in one statement.


What is a word for a flow of water in a certain direction?

in physics a movement in a given direction is considered a "vector quantity" and thus it could be called a vector (the word quantity referning to the speed of the motion)


What word means speed in a specific direction?

velocity is the name given to speed in a specific direction.


Why is it that an object can accelerate while travling at a constant speed but not a constant velocity?

Here's a definition of acceleration: Acceleration is any change in the speed or direction of motion.Velocity is the speed and direction of motion. (If either of them changes, thenthe velocity changes, and by the way, according to the definition, there is alsoacceleration).Speed doesn't have to change in order for acceleration to be present. Accelerationis occurring if the direction of motion is changing, even if the speed is constant.A couple more factoids may be helpful:Acceleration does not mean speeding up.Velocity is not simply a different tech-sounding word for speed.They're different things.


The rate at which an object moves?

speedIn physics:If the direction doesn't matter, the word "speed" is used.If the direction DOES matter, the word "velocity" is used.


What does accaloration mean in science?

You may be talking about acceleration. If that's it, then it means any change inthe speed or direction of motion. If that's not it, then I have never encounteredthat word before, and have no idea.


What is another word for measure of speed and direction?

Velocity A Vector is the measurement of velocity and direction.


Can something have an acceleration while moving at a constant velocity?

No. A object can have acceleration while moving at a constant speed (like the earth in its orbit around the sun). But once you use the word "velocity", you've expanded the decription of its motion to include the direction as well as the speed. The definition of acceleration is a change in either speed or direction, so if there is acceleration, then either the speed or the direction of the velocity (or both) is changing, so the velocity is not constant.


Is speed a concrete noun?

Yes, the noun speed is concretenoun; a word for motion that can be physically measured.


What types of change in motion causes acceleration?

Motion is the change of position over time. The rate of change of position is called or speed. Speed combined with its direction is called velocity. The rate of change of velocity is called acceleration. So, motion in which the speed or direction are changing is accelerated motion. The question uses the word cause, which may be confusing. Technically when a force is applied to a mass, there is acceleration. When there is acceleration the velocity changes. If the object was in motion to begin with, it would speed up or slow down or change direction. If the object was at rest, the force would have caused an increase in speed from zero, so it would start moving. Therefore if you think of a causal relationship, it would be more proper to say force causes acceleration, which IS a change in motion. For an example, an easy one is your bicycle. If you pedal, you are applying force. That force cause the bicycle's speed to increase ... acceleration ... and you are in motion. If you apply more force, you will go faster. If you apply the brakes, you will slow down which is also acceleration (because speed is changing). There is only one way to have motion without acceleration and that is to travel at a constant velocity ... constant speed in a straight line. In practice, there is no motion without acceleration for any period of time, because there is always some minute change in speed or direction.


Do falling objects technically decelerate consider that the velocity is becoming more and more negative?

If you want to be technically correct, then you never talk about "decelerate". That's a word made up by people who have been taught that "accelerate" means "speed up", and who are uncomfortable and unfulfilled until they have a word that means "slow down". "Accelerate" means change speed or direction of motion. A car screeching to a stop, and a car maintaining a steady speed on a curve, are both accelerating, because in both cases, either the speed or the direction of the car's motion is changing. In the case described in the question, the definition of the positive direction of motion is entirely up to the observer. He could just as well choose the downward direction as the positive direction for his observations and calculations. Furthermore, if you want to be just slightly technical, there are very few occasions when you ever have to resort to the confusing concept of a negative velocity. Velocity is a positive speed in a direction. The only reason you would ever need to say that the velocity is negative would occur if you had already stated the speed, and the direction you were about to specify were exactly the direction that the speed is AWAY from. Get your directions straight, and the negative goes away.


Why earth has no acceleration?

The Earth has a huge amount of acceleration ... but that word doesn't mean"speeding up". It means any change of speed or direction of motion. Since theEarth revolves in a closed, curved path around the sun, it's constantly changingits direction of motion. So it's constantly accelerated.


Why an object moving in a circular path at a constant speed is undergoing acceleration and has a force excert on it?

-- An object with no net force on it continues moving at constant speed in a straight line.If it's not moving in a straight line, then there must be net force acting on it.-- "Acceleration" is the word for the situation where either speed or direction of motion changes.Even if speed is constant, acceleration is present if the direction is changing.


What word best describes the difference of velocity and speed?

"Direction". The only difference between velocity and speed is that velocity is a vector while speed is a magnitude. Therefore, velocity has a direction, while speed does not.



Why do you consider a moving object to accelerate even when it slows down or chnges direction without changing speeed?

Because that's the definition of "accelerate". "Accelerate" doesn't mean "speed up", although that's how everybody who rides in a car uses the word. "Accelerate" means "change the speed or the direction of motion, or both".


What is the difference between speed and acceleration?

Speed is the measurement of how fast your locationis changing. It is the scalar value of velocity, which is speed in a given direction. Velocity can change without a change in speed.Acceleration is the measurement of how fast your speed is changing. However, since acceleration is more precisely a change in velocity, you could experience acceleration without a change in speed, if your direction of motion changes. The occupants of a car traveling at constant speed around a curve will experience acceleration toward one side of the car.Speed is simply how fast a person is going at a particular instant in time. As long as you keep going at the same speed and in the same direction, then you have no acceleration. Conversely, acceleration can be defined as the process of changing speed. So, just as having zero speed means that one's position, or distance, does not change, so having zero acceleration means one speed does not change.The word speed refers to how fast one is moving but does not involve the concept of which direction one is moving. However, acceleration can be achieved by changing the direction of motion as well as by changing the rate of motion. The concept required is the idea of a vector, which is a quantity that has both magnitude and direction. In an extreme case, moving in a circle at a constant speed does nothing to change speed, but does change the direction of motion, and so is a case where there is acceleration.


If objects get slower with time the direction of the accuseration is?

The answer depends on what you mean by "accuseration" which is not a word recognised as belonging to the English language.


What is the definition of the word inertia?

Inertia is the resistance of an object to change from a state of rest to a state of motion, change it's speed of motion, or go from motion to rest.


Is speed the change in velocity?

No; the change in velocity over time is called acceleration.Speed and velocity are used interchangeably in popular language; in physics, the word "speed" is used for a scalar (that is, when the direction is irrelevant), and "velocity" is used for a vector (that is, when you need both a magnitude and a direction).No; the change in velocity over time is called acceleration.Speed and velocity are used interchangeably in popular language; in physics, the word "speed" is used for a scalar (that is, when the direction is irrelevant), and "velocity" is used for a vector (that is, when you need both a magnitude and a direction).No; the change in velocity over time is called acceleration.Speed and velocity are used interchangeably in popular language; in physics, the word "speed" is used for a scalar (that is, when the direction is irrelevant), and "velocity" is used for a vector (that is, when you need both a magnitude and a direction).No; the change in velocity over time is called acceleration.Speed and velocity are used interchangeably in popular language; in physics, the word "speed" is used for a scalar (that is, when the direction is irrelevant), and "velocity" is used for a vector (that is, when you need both a magnitude and a direction).



How uniform circular motion is rewarded from accelerated motion?

The purpose and function of the word "rewarded" here are very unclear, as is the thrust of the question. Uniform circular motion IS uniformly accelerated motion, since the direction of the motion is constantly changing.


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