Physics

How can there be a negative position but a positive velocity?

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Well let's see. If you define sea-level as zero elevation, and the upward direction as positive, then a submarine that's in the process of rising to the surface has a negative position and positive velocity. If I spent a while at it, I guess I could think of about 17 other examples, and I'll bet you could too.

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No. Velocity is the change in position over time. So if the velocity is negative, then the change in position must be negative - unless time is moving backwards.

No, momentum can not have a negative velocity. Velocity is the rate of motion of a body from one position to another position in a particular direction. Bodies traveling in opposite directions may appear to have a negative velocity in relationship to each other but any amount of velocity is positive.

Certainly. For example, a pendulum at its left-most position.

no a body can only have positive velocity .sometimes it have negative acceleration

Yes. An object slowing down but still moving in a positive direction has a positive velocity but a negative acceleration.

For positive velocity: p=vt(Position=velocity*time) The velocity will be positive.For negative velocity: p=p(0)+vt(Note: The "0" represents the position at time "0" which is also known as the y-intercept, which is the point where the line crosses the vertical axis. A different label, such as x could be used to represent the position.) The velocity will be negative in this formula.Example: Write the position equation for a person who starts 3 meters behind the reference point and walks with a constant velocity v=6 m/s in the positive direction.Answer: p=-3+6t

Positive Acceleration refers to the force acting on an object whose speed increases as it moves away from its original starting position. If the velocity is increasing along with time it is called positive acceleration, and if the velocity decreases it is negative acceleration.

Positive and negative velocities are simply velocities in opposite directions.Before you start working on the situation, you definewhich direction you'regoing to call positive. Anything you find moving the other way has negativevelocity.

no because acceleration can be negative due to decreasing of velocity so its not possible

Positive velocity: p=vt (position = velocity*time) Example: Write the position equation for a person who starts 3 meters behind the reference point and walks with a constant velocity v=6 m/s in the positive direction. Answer: p=-3+6t Example: What is the position of the person 5 seconds after the start of motion? Answer: p=-3+(6x5)=27 m. Negative velocity: p=p(0)+vt p(0) represents the position at time "0" which is also known as the y-intercept or the point where the line crosses the vertical axis. The velocity of the object in motion would be negative.

when velocity is increasing,accleration is positiveand when velocity is decreasing,accleration is said to be negative.

The 'speed' of a body cannot be negative. But if you are stating the 'velocity' then it can be negative. Negative velocity means it is going opposite to the direction that you decided to call the positive direction.

speed is a scalar quantity with magnitude only but no direction; velocity is a vector with both magnitude (speed) AND direction, which could be positive or negative

Yes.If the car is backing up, but slowing down, then its velocity is in the negative direction, and its acceleration is in the positive direction.

Deceleration. Negative acceleration = Velocity is decreasing by time. Positive acceleration = Velocity is increasing by time. Zero acceleration = Velocity is the same by time.

It depends on what information you have. Also, velocity can be negative - it just means that the object is travelling in the direction opposite to the positive direction for the velocity vector.

positive acceleration helps to increase the velocity for positive direction while negative acceleration resists the motion.

Retardation or deceleration is negative acceleration. It is opposite to the direction of velocity.

If you have a Displacement - time graph, the velocity at a certain point equals displacement over time, displacement is a vector quantity thus is affected by direction so when it has a negative value the velocity has a negative value. and if your still thinking about it, check out this thought: "negative velocity is positive velocity in the other direction"

Because before you start working on it, you define which direction you're goingto call positive. Then, whenever you find anything moving in that direction,you call the velocity positive, and if you find something moving in the oppositedirection, you call that negative velocity.

Quite simply, this means that momentum is a vector quantity; the direction is relevant. This is useful, for example, for calculations involving the conservation of momentum. Actually momentum is the product of velocity and mass, and velocity is also a vector quantity - thus, in this example, one object will have a positive velocity (more precisely: a positive component of the velocity along the x-axis, for example), the other, negative. Multiplying this velocity by the mass will also give a quantity which may be positive or negative (or rather, have positive or negative components).

Acceleration is negative if velocity is decreasing with time. Since velocity is a vector this can occur in one of two ways: 1) you are slowing down in the direction of motion and the velocity in that direction is defined as positive (this is what we usually mean by negative acceleration) 2) you are speeding up in the direction of motion and the velocity in that direction is defined as negative. An example of this is an object launched into the air which immediately starts to decelerate in it's upward velocity, reaches it's highest velocity, and then begins accelerating towards the ground. If we call the velocity upward a positive velocity, then when it starts falling, it has negative velocity. Note that acceleration (due to gravity) is negative the whole time.

well the difference between positive and negative velocity would have to be that if your motion speeds up than you have a positive and when or if your motion slows down then you would have a negative accelerarion!!!!

Well velocity is basically the same thing as speed but with direction (velocity can be negative or positive and speed is always positive). l velocity l = speed So a change in velocity means a change in speed.

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