I'm doing an invention for a science project and I need a motion sensor that could be rigged to move with you.How would you get a motion sensor to move with you?You would need a stepper motor and a controller.
You would need to write a program to lock on to the motion.
There are some commercial units out there. Many are used for cameras.How would you get a motion sensor to move with you?you can use the principle of closed loop systems by making two sensors that detect motions and sum their output int an OP amplifier and feed the signal into a dc motor
let D1 and D2 so the normal output is 0 when D1 operate The OP will give a + signal so the motor will turn clockwise.
if D2 operate The OP will give a - signal so the motor will turn anti - clockwise
this is a very basic idea and i hope it will inspire you for a more complected system
Saturday, February 18, 2012
Need help understanding a rotational motion physics concept. What exactly is a net torque?
My physics notes say that an object will remain in "a state of uniform motion unless acted on by a net torque." Does this mean that unless something stops an object from rotating, it will keep rotating forever? Is a net torque always equal to zero and will it keep an object at rest? Is a net torque a balanced force?Need help understanding a rotational motion physics concept. What exactly is a net torque?In answer to UR first question, a clarification is necessary: A rotating object may be: 1) spinning at constant speed (called "uniform motion") or 2) changing speed {either accelerating or decelerating angularly}.
If an object is spinning at CONSTANT speed it will do so forever IF no NET torque acts on it. As this is the same concept as is true for linear motion of objects when no NET force acts on them - it is part of Newton's 1st Law.
In order to have an object start spinning from rest OR have a spinning object CHANGE speed, a NET torque must act on the object.
A NET torque is never = 0 by definition. The fact that a NET torque exists means that the SUM of all torques that act on an object %26gt; 0. Therefore it is an UN-balanced torque.
Another physics name for "torque" is "moment". Both are identical in meaning and have as SI units: "meter-Newtons" or m-N.
{I always put the m before the N for torques/moments because vice-versa: "Newton-Meters" or N-m can be confused with the energy unit: Joules which is N-m also}Need help understanding a rotational motion physics concept. What exactly is a net torque?Hello Chevita127, yes unless an external force comes into play the body being in uniform motion would ever continue that motion.
In case of linear motion we use force. But in case of rotational motion we use moment of the force which is otherwise known as torque.
If we keep a magnetic needle in a region where two magnetic field interact at right angles to each other then the torque acting will become equal and opposite and hence the needle gets settled in an equilibrium deflected position.
Torque is a vector whose direction will be normal to the plane containing the force and the radius vector.Need help understanding a rotational motion physics concept. What exactly is a net torque?Torque is nothing more than a rotational twisting equivalent of a force. I will explain it later.
Before jumping to understand the principles of rotational motion, you should first be sure you fully understand the laws of pure translational motion. There are many analogies between the two, and there are ways in which the concepts relate.
Also, net is nothing more than total. As in a vector sum of all the influences (forces or torques depending on which you are interested in).
"Does this mean that unless something stops an object from rotating, it will keep rotating forever?"
Yes indeed. This is the rotational version of Newton's first law and the principle of inertia. Don't let frictional effects deceive you. Friction is a force/torque, just like a human push/pull or gravity is a force/can be a torque if applied correct.
"Is a net torque always equal to zero and will it keep an object at rest?"
No, it is not always equal to zero, otherwise I wouldn't be able to type this message. It is only zero, if the target body is either not rotating, or rotating at a constant speed, constant axis, constant direction (i.e. constant angular velocity).
A net torque of zero is necessary for a body to remain rotationally at rest. That is true. However, just because a net torque was zero, does not mean the body will be brought to rest. If a body spins free of friction with zero net torque, it will rotate forever around the same axis, at the same speed, in the same direction.
If an object is spinning at CONSTANT speed it will do so forever IF no NET torque acts on it. As this is the same concept as is true for linear motion of objects when no NET force acts on them - it is part of Newton's 1st Law.
In order to have an object start spinning from rest OR have a spinning object CHANGE speed, a NET torque must act on the object.
A NET torque is never = 0 by definition. The fact that a NET torque exists means that the SUM of all torques that act on an object %26gt; 0. Therefore it is an UN-balanced torque.
Another physics name for "torque" is "moment". Both are identical in meaning and have as SI units: "meter-Newtons" or m-N.
{I always put the m before the N for torques/moments because vice-versa: "Newton-Meters" or N-m can be confused with the energy unit: Joules which is N-m also}Need help understanding a rotational motion physics concept. What exactly is a net torque?Hello Chevita127, yes unless an external force comes into play the body being in uniform motion would ever continue that motion.
In case of linear motion we use force. But in case of rotational motion we use moment of the force which is otherwise known as torque.
If we keep a magnetic needle in a region where two magnetic field interact at right angles to each other then the torque acting will become equal and opposite and hence the needle gets settled in an equilibrium deflected position.
Torque is a vector whose direction will be normal to the plane containing the force and the radius vector.Need help understanding a rotational motion physics concept. What exactly is a net torque?Torque is nothing more than a rotational twisting equivalent of a force. I will explain it later.
Before jumping to understand the principles of rotational motion, you should first be sure you fully understand the laws of pure translational motion. There are many analogies between the two, and there are ways in which the concepts relate.
Also, net is nothing more than total. As in a vector sum of all the influences (forces or torques depending on which you are interested in).
"Does this mean that unless something stops an object from rotating, it will keep rotating forever?"
Yes indeed. This is the rotational version of Newton's first law and the principle of inertia. Don't let frictional effects deceive you. Friction is a force/torque, just like a human push/pull or gravity is a force/can be a torque if applied correct.
"Is a net torque always equal to zero and will it keep an object at rest?"
No, it is not always equal to zero, otherwise I wouldn't be able to type this message. It is only zero, if the target body is either not rotating, or rotating at a constant speed, constant axis, constant direction (i.e. constant angular velocity).
A net torque of zero is necessary for a body to remain rotationally at rest. That is true. However, just because a net torque was zero, does not mean the body will be brought to rest. If a body spins free of friction with zero net torque, it will rotate forever around the same axis, at the same speed, in the same direction.
How do I file a motion to appear telephonically in montana?
I'm getting a divorce in Missoula, Montana and i'm stationed overseas. The clerk of court office said I would have to file a motion to appear telephonically but they don't provide that document. Does anyone know of a website or google search I can do that can give me a layout/format?How do I file a motion to appear telephonically in montana?don't think its a document, think its that they want you there via the telephone, or computer.How do I file a motion to appear telephonically in montana?A lawyer would need to file the motion with the Court. Sweet Mildred is our leader...crawl into her playpen.
What is the magnitude of the impulse required in the direction of motion to increase its speed?
A proton has mass 1.7 *10-27 kg. What is the magnitude of the impulse required in the direction of motion to increase its speed from 0.994c to 0.997c?What is the magnitude of the impulse required in the direction of motion to increase its speed?the magnitude of the impulse is equal the change in momentum, or mass times change in velocity. Since the velocity is so high in this case however, you must use the formula for momentum = mass * volume * (1/sqrt(1-(v/c)^2)). Use this formula to calculate initial and final momentum and then find the difference and that will be your answer.mopar arizona weather
Where can I find motion detector lights without the dusk to dawn feature?
Where can I find motion detector lights without the dusk to dawn feature?
I want to put motion detection lights in my basement but I don't want to have the dusk to dawn feature on them because when the first light comes on the rest will think it is daylight and they won't come on. Does anyone know a brand or a store that has motion detecting lights without the dusk to dawn feature.Where can I find motion detector lights without the dusk to dawn feature?Got mine in a local hardware store. It has the option of turning the dusk/dawn feature off and on.
http://www.homedepot.ca/webapp/wcs/store鈥?/a>
Here is another idea..motion activated light switch so any light will work if you cannot find the light you want. Link is for the light switch.
I want to put motion detection lights in my basement but I don't want to have the dusk to dawn feature on them because when the first light comes on the rest will think it is daylight and they won't come on. Does anyone know a brand or a store that has motion detecting lights without the dusk to dawn feature.Where can I find motion detector lights without the dusk to dawn feature?Got mine in a local hardware store. It has the option of turning the dusk/dawn feature off and on.
http://www.homedepot.ca/webapp/wcs/store鈥?/a>
Here is another idea..motion activated light switch so any light will work if you cannot find the light you want. Link is for the light switch.
How do i record slow motion videos using canon 550d?
Can anyone explain what are the basic settings to be done to record a slow motion video using canon 550d?!
Do guide to any other forums or web-links that'd be helpful.
Thanks.How do i record slow motion videos using canon 550d?You'll have to record in 60FPS. Otherwise, the video won't look good.
Then just record the video. After that, edit the video on your PC.
Do guide to any other forums or web-links that'd be helpful.
Thanks.How do i record slow motion videos using canon 550d?You'll have to record in 60FPS. Otherwise, the video won't look good.
Then just record the video. After that, edit the video on your PC.
What would happen to the motion of smoke particles when the air is heated ?
What would happen to the motion of smoke particles when the air is heated ?
Explain little more ! Thank you very muchWhat would happen to the motion of smoke particles when the air is heated ?They would distant more from each otherWhat would happen to the motion of smoke particles when the air is heated ?The air molecules are randomly moving and they can't be viewed with our naked eye. So, when we heat the air molecules they gain kinetic energy and move at a greater speed. Their frequency of collision increases. And as air molecules will collide with the dust or smoke particles, therefore we'll see that smoke particles are moving with a greater speed.What would happen to the motion of smoke particles when the air is heated ?if the smoke particle get heated the collision ratio b\w them is increased and with results in increase in the energy of hydration therefore they get excited and vibrate with more frequency
Explain little more ! Thank you very muchWhat would happen to the motion of smoke particles when the air is heated ?They would distant more from each otherWhat would happen to the motion of smoke particles when the air is heated ?The air molecules are randomly moving and they can't be viewed with our naked eye. So, when we heat the air molecules they gain kinetic energy and move at a greater speed. Their frequency of collision increases. And as air molecules will collide with the dust or smoke particles, therefore we'll see that smoke particles are moving with a greater speed.What would happen to the motion of smoke particles when the air is heated ?if the smoke particle get heated the collision ratio b\w them is increased and with results in increase in the energy of hydration therefore they get excited and vibrate with more frequency
Subscribe to:
Posts (Atom)