Velocity is a vector; velocity tells you how fast something is traveling (speed),
and its direction. A change in velocity could indicate a change in direction or
speed, or both.
Imagine you are driving in your car on a straight, flat highway. Neglect curvature of the earth. You set the cruise control and stay in your lane without having to steer. Now you are traveling at a constant speed in a constant direction. This is an example of constant velocity.
Speed:
-- 88 feet per second
-- 30 miles per hour
-- 1 meter per minute
Velocity:
-- 88 feet per second north
-- 30 miles per hour east
-- 1 meter per minute up
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Three Equal Speeds, Three Different Velocities:
-- 60 miles per hour north
-- 1,440 miles per day west
-- 1 mile per minute down
---- ---- == ==
No. Speed can remain constant when velocity changes, but velocity can't remain constant when speed changes.
The speed can be constant but the velocity can't, because the directionof motion ... which is a component of velocity ... is changing. Also the velocity of a moving body changes when its speed changes but remains moving towards the same direction ... :) :]
The definition of acceleration is: Any change of velocity, that is, speed or direction of motion. If an object is undergoing constant acceleration, then the definition says that its velocity must be changing.
The answer for the blank is "constant".
there is no acceleration if the body is moving with constant velocity
No. Speed can remain constant when velocity changes, but velocity can't remain constant when speed changes.
its frequency remains constant but velocity changes.
The speed can be constant but the velocity can't, because the directionof motion ... which is a component of velocity ... is changing. Also the velocity of a moving body changes when its speed changes but remains moving towards the same direction ... :) :]
The definition of acceleration is: Any change of velocity, that is, speed or direction of motion. If an object is undergoing constant acceleration, then the definition says that its velocity must be changing.
If it changes direction
The answer for the blank is "constant".
Velocity can change even if speed is constant.
This is not true practically. Theoretically speaking as velocity increases with wavelength remains constant, then frequency has to increase accordingly. Since the formula for velocity is given as: velocity of the wave v = frequency (nu) * wavelength (lamda). In reality the characteristic, namely, frequency remains constant when the speed of the wave changes as it traverses in different medium.
This is not true practically. Theoretically speaking as velocity increases with wavelength remains constant, then frequency has to increase accordingly. Since the formula for velocity is given as: velocity of the wave v = frequency (nu) * wavelength (lamda). In reality the characteristic, namely, frequency remains constant when the speed of the wave changes as it traverses in different medium.
there is no acceleration if the body is moving with constant velocity
An object's speed changes whenever the rate of change between the distance the object travels and the time it takes to travel that distance changes. Do not confuse speed with velocity; speed is scalar, and velocity is vector. Velocity can change when speed remains constant.
An object's speed changes whenever the rate of change between the distance the object travels and the time it takes to travel that distance changes. Do not confuse speed with velocity; speed is scalar, and velocity is vector. Velocity can change when speed remains constant.