Accelerometer vs gyros

Yep.

When you rotate an object at a constant angular speed, which of the following has to be true:

  1. there is force on the object (thus it can be sensed by an accelerometer);
  2. there is no force on the object;
  3. all of the above;
  4. none of the above.

dhenry:

Yep.

When you rotate an object at a constant angular speed, which of the following has to be true:

  1. there is force on the object (thus it can be sensed by an accelerometer);
  2. there is no force on the object;
  3. all of the above;
  4. none of the above.

I'll pick A.

Thanks folks for the clarification.

I'll pick A.

You would be correct.

(Blush)

Phew, good to know some parts of the brain still work.

dhenry:

  1. there is force on the object (thus it can be sensed by an accelerometer);

If you're using an accelerometer to sense rotation, you're assuming:

  1. The accelerometer is not at the center of axis of rotation.
  2. The distance from the center of rotation to the accelerometer is known.
  3. A second accelerometer is being used so tilt can be differentiated from spin.
  4. All of the above.

But to answer your question, if an object is rotating at a constant angular velocity then there is no force being applied to it. Acceleration is a change in velocity.

dhenry:

I'll pick A.

You would be correct.

Ummm....Newtons first law disagrees with you.

lost_and_confused:
I'll pick A.

Thanks folks for the clarification.

You're going to be be disappointed.

Don't blame me though, I only own one of the things and have seen it with my own eyes.

if an object is rotating at a constant angular velocity then there is no force being applied to it.

Then what's keeping the earth from falling into the sun?

Acceleration is a change in velocity

Q1: You are going east at 1km/h, and then you go west at 1km/h. Is there a change in velocity?

Q2: what does that mean in the context of the boat?

have seen it with my own eyes.

Millions of people have seen a flat earth.

If we all believed in our own eyes, we would still be in the dark age.

Then what's keeping the earth from falling into the sun?

A big stack of turtles.

dhenry:

if an object is rotating at a constant angular velocity then there is no force being applied to it.

Then what's keeping the earth from falling into the sun?

I'm not sure you know what rotation is.

According to you, these are completely unnecessary: mpu6050 for sale | eBay

Yet they exist... how do you explain that?

According to you, these are completely unnecessary

You are mistaken.

dhenry:

According to you, these are completely unnecessary

You are mistaken.

...says the person who doesn't understand Newton's First Law Of Motion.

dhenry:
Q1: You are going east at 1km/h, and then you go west at 1km/h. Is there a change in velocity?

Yes. The object has to stop to go in the opposite direction.

Dhenry, you are making yourself look worse and worse with every post you make. If you have any dignity left, before your next post, do some research on the subject.

Q1: You are going east at 1km/h, and then you go west at 1km/h. Is there a change in velocity?

Is this one of those "what colour was the bear?" type questions?
Of course there is a change of velocity, because velocity is a vector quantity, so specifies a rate of displacement and direction.

What was it the OP was asking about?

To save you some time, the radial acceleration for an object orbiting at speed v and radius r is v^2 / r.

I guess this thread shows why we need better teachers.

dhenry:
To save you some time, the radial acceleration for an object orbiting at speed v and radius r is v^2 / r.

I guess this thread shows why we need better teachers.

What does that have to do with measuring yaw using an accelerometer?

Groove:

Then what's keeping the earth from falling into the sun?

A big stack of turtles.

I thought it was one big turtle and four elephants?

fungus:
What does that have to do with measuring yaw using an accelerometer?

Copy and paste featuring Google makes everyone sound smart.