Because Newton’s laws of motion relate any change in VELOCITY (not just speed) to the application of a net force. Even though circular motion can be at a constant speed,
its changing velocity requires that a (centripetal) force be present to deviate from a straight line and maintain its circular path
.
How can speed be constant but velocity changes?
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.
Can an object be at constant speed but different velocity?
Yes,
the object can have a constant speed
, but still, its velocity is constantly changing. … So, if the magnitude of velocity, i.e., the speed of an object is constant, but the direction of velocity is continuously shifting, we can say that the object possesses a varying velocity.
Why can an object accelerate at a constant speed but not velocity?
An object’s acceleration is the rate its velocity (speed and direction) changes. Therefore, an object can accelerate even if its speed is constant –
if its direction changes
. If an object’s velocity is constant, however, its acceleration will be zero.
Can you have speed but no velocity?
If the velocity is constant however, the acceleration is zero (because the velocity isn’t changing over time).
Although at an instant in time it is possible to have zero velocity whilst accelerating
. For example, if you drop an object at the instant you release it it has zero velocity but it is accelerating.
Does constant speed have constant velocity?
To have a constant velocity, an object must have a constant speed in a constant direction
. Constant direction constrains the object to motion to a straight path.
Why the change in velocity with distance is not constant?
Because acceleration is a rate based on time
, not distance. The amount of distance you travel in a length of time will increase with your velocity, the acceleration remains constant.
How can an object have a constant speed but still accelerate?
For this reason, it can be safely concluded that an object moving in a circle at constant speed is indeed accelerating. It is accelerating because
the direction of the velocity vector is changing
.
Can an object accelerate if its speed is constant Can an object accelerate if its velocity is constant?
No
:if the velocity is constant ,there is no a change in the velocity hence acceleration is zero.
Is it possible to travel at a constant speed while accelerating?
1 Answers.
Yes , it is possible to be accelerating while travelling at constant speed
. This happens in a uniform circular motion, in which the object moves at a constant speed but is still accelerating. The presence of acceleration is why the object moves in a circular motion.
What are the differences between speed and velocity?
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement
.
Why can distance be used as velocity?
Velocity is the measure of the amount of distance an object covers in a given amount of time
. Here’s a word equation that expresses the relationship between distance, velocity and time: Velocity equals distance travelled divided by the time it takes to get there.
How does velocity vary with distance traveled?
The average speed is (v+u)/2, and the total time to get from velocity u to velocity v is t=(v−u)/a, assuming constant acceleration. Hence, the distance traveled is
s=(v+u2)t=(v+u2)(v−ua)
. Finally, this gives 2as=v2−u2.
How does speed affect time and distance?
Whatever speed is,
it involves both distance and time
. “Faster” means either “farther” (greater distance) or “sooner” (less time). Doubling one’s speed would mean doubling one’s distance traveled in a given amount of time. Doubling one’s speed would also mean halving the time required to travel a given distance.
