No, but you can say: "The acceleration directed to the right is zero".songoku said:Can I say the acceleration is zero and is directed to the right?
I can also say: "the acceleration directed to any direction is zero"?A.T. said:No, but you can say: "The acceleration directed to the right is zero".
There's only one thing: the acceleration. You can resolve that into radial and tangential components, certainly, and you may find that there is no component in the tangential direction. That's fine - all you are saying is that the acceleration is perpendicular to the tangential direction. See above regarding whether this zero component points in the clockwise or anticlockwise direction.songoku said:Ok so for another case: an object moves in circular with constant speed.
The linear acceleration will be zero. The direction of this linear acceleration will be tangential or we can not assign the direction to this zero linear acceleration of circular motion?
Yes. Or just "the acceleration is zero", which is the way I'd phrase it.songoku said:I can also say: "the acceleration directed to any direction is zero"?
No. The angular acceleration is zero. The linear acceleration is non-zero and centripetal. The tangential component of linear acceleration is zero.songoku said:Ok so for another case: an object moves in circular with constant speed.
The linear acceleration will be zero. The direction of this linear acceleration will be tangential ...
Correct.songoku said:I thought there are 2 correct answers: B and C but now it seems that the correct answer is only B.
The magnitude is not zero - an object moving at speed v in a circle of radius r has acceleration ##v^2/r## - the centripetal acceleration.songoku said:At first, I have my doubt about answer C because I think the magnitude is zero
I'd say that there is just acceleration. This can always be broken down into a component towards the centre of the circle and a component tangential to the circle. If you want to view them as separate things, though, they are both linear accelerations, yes.songoku said:But the correct concept will be: the centripetal and tangential accelerations are both linear acceleration in circular motion?
No. It moves with constant linear speed, but speed is the magnitude of the velocity vector. The vector is changing all the time, as this is circular motion and the direction is never constant.songoku said:When the tangential acceleration is zero, the object will move with constant linear velocity
Yes, linear acceleration and angular acceleration are two different quantities. Centripetal acceleration and tangential acceleration are components of linear acceleration.songoku said:But the correct concept will be: the centripetal and tangential accelerations are both linear acceleration in circular motion?
If I understand your confusion, you may be reasoning that...songoku said:I think the magnitude is zero but there is still direction (tangential)
A.T. said:Yes, linear acceleration and angular acceleration are two different quantities. Centripetal acceleration and tangential acceleration are components of linear acceleration.
Correct. The magnitude of the acceleration is constant. The complete vector is not since its direction is changing.conscience said:In the question stated in post#4 , acceleration has same magnitude v2/r and is always directed towards the center . So why do we say that linear acceleration is not constant ?
Is it because even though the acceleration is always pointing towards the center , that direction itself is continuously changing ?
Yes, a vector with zero magnitude can have a direction. This is because the direction of a vector is independent of its magnitude. Even though the length of the vector is zero, it still has a direction in which it points.
A vector with a direction but zero magnitude is known as a null vector. This means that the vector does not have any physical meaning or effect, but it still has a direction in which it points.
No, a zero vector cannot be considered as a unit vector. A unit vector is defined as a vector with a magnitude of 1, and since the magnitude of a zero vector is 0, it cannot be considered as a unit vector.
Yes, a zero vector is parallel to all other vectors. This is because the direction of a vector is not affected by its magnitude. So even though a zero vector has no magnitude, it still has a direction in which it points and therefore is parallel to all other vectors.
Yes, a vector's direction can change without changing its magnitude. This is because the magnitude of a vector is solely determined by its length or size, while the direction is determined by the angle it makes with a reference axis. So, as long as the length of the vector remains the same, its direction can change without affecting its magnitude.