Is acceleration constant when velocity is constant?
By definition, acceleration means change in velocity. So if the velocity is constant, this means both speed and direction are constant. And there has to be at least one of these things changing for the velocity to change, the acceleration is zero if none of these things change and the velocity is said to be constant.
To say that an object has constant velocity means that it is moving along a straight line, and as every second of time goes by, the object travels through the same number of meters. Or we could say that it travels equal displacements per equal time intervals.
- The body can be said to be moving with constant velocity if it travels on a straight path with constant speed. When a body performs motion with uniform velocity, magnitude of the velocity will remain same but direction may change.
- Constant Negative Velocity. Observe that the object below moves with a constant velocity in the negative direction. The velocity-time graph shows a horizontal line with zero slope (meaning that there is zero acceleration); the line is located in the negative region of the graph (corresponding to a negative velocity).
- In chemical kinetics a reaction rate constant or reaction rate coefficient, k, quantifies the rate of a chemical reaction. the reaction rate is often found to have the form: Here k(T) is the reaction rate constant that depends on temperature.
Therefore, at a constant speed (meaning no change in the magnitude of the velocity) an object could be changing its direction, and thus, accelerating. On the other hand, a constant velocity means no change in velocity (both magnitude and direction), so in this case the acceleration must be zero (no acceleration). 34.)
- Speed is a magnitude of velocity, and so if the magnitude changes, then the velocity also has to change. But, the reverse case is possible: an object can have a constant speed but ever changing velocity. Speed 2. Direction if any of this or both alters velocity changes.
- However, if the acceleration is always perpendicular to the velocity, the velocity will change direction without change it's magnitude. This is the circular motion. So, for circular motion, the force(acceleration) always perpendicular to it's velocity.
- Furthermore, when an object travels the same distance every second, then the object is said to be moving with constant velocity. This means that the magnitude of the velocity (or speed) and the direction of the velocity both remain constant.
To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is constant, its velocity is changing. Velocity, being a vector, has a constant magnitude but a changing direction.
- In the end, this is major difference between Speed and Velocity. Though both are calculated using the same units (km/h, m/s, mph, etc.), the two are different in that one is described using numerical values alone (i.e. a scalar quantity) whereas the other describes both magnitude and direction (a vector quantity).
- This limit is the derivative; that is, In common, everyday English, "velocity" and "speed" mean the same thing. In Physics, there is a distinction that is sometimes useful. Velocity is positive if an object is moving to the right and it is negative if an object is moving to the left.
- The average speed of an object is defined as the distance traveled divided by the time elapsed. Velocity is a vector quantity, and average velocity can be defined as the displacement divided by the time.
Updated: 25th November 2019