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Answered 2013-12-18 01:42:56

Velocity changes as direction is continuously changing.

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No. Speed is how fast, Velocity is how fast AND in what direction. Think of a car driving in a circle at 60 mph. You change velocity as the car turns on the curve (new direction = new velocity), without changing your speed at 60mph.

Velocity is a vector whereas speed only has magnitude, velocity takes into account an objects speed as-well as its direction. When an object has changing velocity, the object is said to be accelerating. The situation you describe is known as circular motion.

When its speed changes, when it turns changing its direction of travel or when both occur.

Easy answer: velocity is defined as speed in a specific direction. So, if a car is traveling at a velocity of due west, 60 miles per hour, then turns onto a road going north, the velocity has changed to due north, 60 miles per hour. But the speed has stayed the same.

Yes, since velocity is speed and direction its average can be zero. For example say a plane flies from point A to point B at 300 mph and turns around to go from B to A at 300 mph; its average velocity is 0 since it is in the same spot as it started ( the velocity vectors cancel) but its average speed is 300 mph.

By changing direction. Acceleration is a change in velocity. Since velocity takes direction into account, while speed does not, an object can having a changing velocity even while its speed remains the same. And while that object is changing its velocity by changing its direction, it is accelerating, regardless of its speed remaining constant. For example, if a car is driving north at constant speed of 20mph, its speed is 20mph, while its velocity is 20mph towards the north. At this point, the car is not accelerating. Now if the car turns a corner to head east while maintaining its speed of 20mph, its velocity is changing from 20mph northward to 20mph north-eastward and finally to 20mph eastward. As it is turning, it is accelerating. However, as soon as it stops turning, the car is no longer accelerating.

The car undergoes a change in velocity. It accelerates (and does so at a constant rate - if the rate of turn is constant) in the direction of the turn. The speed is constant, but the direction the car is going changes at each instant in time because it is turning. And because it is changing direction, that means its velocity is changing (because velocity is speed plus a direction vector).

Yes, the magnitude of speed is the same as the magnitude of velocity. Velocity V= s(R/r)= sR' where s is the speed and R'=(R/r) is the unit vector in the direction R, where R is a position vector and r is the magnitude of R. So "s' is the magnitude (scalar) of the velocity. In Physics, a rotating object can have constant speed and changing direction. A car can have the same speed on the speedometer and experience a force as it turns at the this constant speed. The turning creates a force as there is acceleration caused by the change in velocity, in this case the change in direction, not the change in speed..

And object's speed refers to a magnitude of movement in relation to something (often the ground or a stationary relative object). A Vector, usually represented by an arrow, shows a scalar (some magnitude or speed) and a direction. The scalar magnitude could be an object's speed. However, without a directional component, it's not a vector, simply a speed of scalar. Velocity IS a vector because velocity by definition includes a scalar (force/speed) AND a direction in which it is moving. Therefore Velocity is a Vector, but Speed is only part of what makes a Vector. Example: Bob is running 10 mph North along a sidewalk. His velocity is 10 miles per hour North. A Vector drawing would show an arrow 10 units long pointing North along the sidewalk. It's speed is a flat 10 mph at that given moment, it is the scalar portion of the vector without the directional component. As an addition, Acceleration is the rate of change in Velocity. So we have a Speed- 10 mph. Then we have Velocity- 10 mph North. Acceleration is what shows his velocity changing... How quickly does he speed up at the beginning of his run... How quickly does he slow down at the end... At what rate does his direction/speed change as he turns a corner...etc.

Yes, acceleration is the how the velocity changes. This also includes when an object turns

Acceleration is the rate of change of velocity (how fast velocity changes - dv/dt). You should also remember that acceleration is a vector, meaning that direction matters. If any objects goes around - even at a constant speed - in a curve, its direction is changing, therefore its velocity its changing, therefore it is accelerating.

There is many as as what is the elevation, how deep, how many turns are in it, how sharp are the turns are just a few.

The speed of the car has not changed. What has changed is the direction of travel. Velocity is a combination of speed and direction, so has changed. Newton's laws say that a body will continue to travel at its starting velocity unless acted on by an external force. There are two forces working here. 1 a force reducing the northward speed of 88 km/h to zero, and 2 a force accelerating the car eastward up to 88 km/h.

it turns into a chrisalis, silly!

Velocity is speed and direction. The velocity would be zero because the 50 miles N cancel the 50 miles S. The speed is 100 mi/5 h = 20 mph.

It means how fast something rotates. Rather than taking the linear speed (meters per second, or some other common unit of speed), the angular velocity is specified in radians per second, degrees per second, revolutions (full turns) per minute, or something similar. By this definition, each part of a solid, rotating object rotates at the same angular speed.

no. see the definition of acceleration. it can remain a constant speed while the velocity changes. *Edit* Actually, the answer is yes. The algebraic formula for acceleration is displacement over time but you are only thinking in terms of linear motion, or in the case of this scenario, a straight road. But when the car follows the road as it snakes or rounds a bend its acceleration is changing even if its speed is not. A more specific definition of acceleration is the change in velocity over the change in time. Velocity is a measurement of speed but with a direction and when an object goes into a circular motion path (or any motion path that isn't linear) its velocity is continually changing and a change in velocity means a change in acceleration. Plainly put, if the car turns a corner with a constant speed, the magnitude is constant but the acceleration vector is not.

Momentum. Momentum is mass x velocity. Velocity is speed in a direction. Even if the bus changes direction, you still have momentum in the original direction until some force pushes you in another direction. That takes a moment in a car or bus, so until your momentum is that of the bus, you'll still be going in a slightly different direction, which happens to seem 'outwards'.

The atoms speed up building up kenetic energy which forces them apart and that is what turns the liquid into a gas

nothing happens but your shirt turns yellow

Sure. That just means your speed is increasing. It happens every time the light turns greenand you stomp the gas in order to get going again.

Acid turns blue litmus red and maintains red litmus at the same color.

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