can an object vary in velocity if its pseed is constant?

Question

plz give examples

Answer 1

Velocity is speed with respect to direction. Therefore when direction changes even negative values will have to be assigned.
VR

Answer 2

Velocity is a vector, which means it is defined by both magnitude and direction. The magnitude of a velocity vector is called speed.

The direction of a velocity vector is typically stated as a degree of angle with respect to some basis, like an X axis on a graph. So we might write, for example: v = Scos(deg); where v is the velocity, S is the speed (or magnitude), and cos(deg) is the cosine of an angle with respect to zero angle point (e.g., on the x axis).

The difference between S and v is significant because it has real physical meaning. Centripetal force, for example, is a force inward toward the center of a spinning system (like a rock spinning around on the end of a string). That force is defined by C = mv^2/r; where m is the mass (of the rock), r is the length of string when stretched out tightly by the spin, and v is the tangential velocity vector of the rock.

Note it's the vector, not the speed, of the rock that counts. For the spinning rock, the speed is usually constant, but the direction of that speed, and thus the velocity, is constantly changing as the rock swings around in a circle.

Changes in velocity in general cause forces, not changes in speed. There are certain specific instances when velocity and speed can be used interchangeably, but in general, forces are the result of changes in velocity, not in speed. v and S are interchangeable when v = S cos(deg) = S; where cos(deg = 0) = 1.

So to answer your question, if S = constant, we can still vary v by simply varying cos(deg), which is done by varying deg which is the heading of that speed.

Answer 3

Yes velocity is speed in a given direction. Any object moving in a circular fashion at a constant speed (like in a centrifuge) has a constantly changing velocity.

Answer 4

no an object cannot vary in velocity if its pseed is constant .
because velocity is speed +direction.
for eg. if an object is moving with the speed 1m per sec then its velocity imlies in which direction.

Answer 5

yes an object can have a constant speed but its velocity changes due to change in direction

Answer 6

I think velocity is speed and direction

Answer 7

not really... velocity can indicate direction while a speed (I'm assuming you meant speed) is just a quantity. So +/- velocity can have the same speed...