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Why an object falls of placed in air unsupported if a room is an inertial frame of reference. this means the room is moving in the upward direction how?
Wiki User
∙ 11y ago
If the object is falling down, it is accelerating. "Inertial frames of reference" do not include acceleration, so the falling object can't be considered an inertial frame of reference, according to the Special Theory of Relativity. However, the General Theory or Relativity explores additional complications due to gravity.
In any case, if you wish, you can use the object accelerating downward as a reference frame (just don't call it "inertial"); in this case, obviously the room is accelerating upward, compared to the falling object. It all depends what object you choose as your reference frame.
Wiki User
∙ 11y ago
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Difference between inertial frame of reference and non-inertial frame of reference?
An inertial frame of reference (FOR) is a non-accelerating FOR , for example if a person is observing a moving car while at rest or while moving at constant velocity, he is in an inertial FOR. A non-inertial frame of reference is an accelerating FOR for example a rotating FOR. ( Rotation requires centripetal force and centripetal acceleration so any rotating object always requires a centripetal acceleration to rotate.)
What changes the speed or direction of a moving object?
Forces are the only things that can change an object's speed or direction, if both you and the object are in appropriately chosen inertial reference frames. If you or the object are in a non-inertial frame (or frames), then the object's speed and direction can change with no cause at all. It's like magic. This actually happens in everyday life, in subtle ways, owing to things like the earth's rotation and its revolution around the sun. The effects are small so you don't feel them, but if you watch for a long, long time, you can detect changes of speed and direction that are best explained by these causes that we do not easily perceive.
How does an object behave if there are no forces acting on it?
The simple answer is that the object moves at a constant velocity (or remains stationary if it wasn't moving). This is known as Newton's First Law.However, Newton's Laws only apply in what is known as an inertial reference frame. Unfortunately, the definition of an inertial reference frame is a reference frame in which Newton's Laws apply. But, in principle, if you took an object far away from everything, then the simple answer above would, in principle, be correct.
How can you tell that an object is in motion?
it would be in the process of moving It depends on your perspective. If you were also moving in the same direction and at the same speed, is the object moving?
Can movement only be measured with reference that is assumed to be fixed in pace?
No, Einstein proved that all inertial frames are equally valid references. You don't have to assume it's "fixed in place" or even know exactly how it's moving relative to any other frame as long as you know how the measured object is moving relative to the chosen reference frame.
Difference between inertial frame of reference and non-inertial frame of reference?
An inertial frame of reference (FOR) is a non-accelerating FOR , for example if a person is observing a moving car while at rest or while moving at constant velocity, he is in an inertial FOR. A non-inertial frame of reference is an accelerating FOR for example a rotating FOR. ( Rotation requires centripetal force and centripetal acceleration so any rotating object always requires a centripetal acceleration to rotate.)
Is velocity constant?
Constant velocity is known as uniform velocity, which is achieved when the net force (or resultant force) of a body is zero i.e. there is no external forces causing the body to accelerate or decelerate.To look at it from a Calculus dimension:If the derivative of the position vector with respect to time = 0 in an inertial reference frame.i.e. it is moving with constant speed in a direction in an inertial reference frame.I prefer the following statement which is equivalent to the above:If the second derivitive (i.e. acceleration) of the position vector is 0 in any one inertial frame, then it is 0 in all inertial frames and there exists at least oneinertial frame in which the first derivitive (i.e. velocity) of the position vector is 0.In short:Neither speed nor direction of motion changes.
What changes the speed or direction of a moving object?
Forces are the only things that can change an object's speed or direction, if both you and the object are in appropriately chosen inertial reference frames. If you or the object are in a non-inertial frame (or frames), then the object's speed and direction can change with no cause at all. It's like magic. This actually happens in everyday life, in subtle ways, owing to things like the earth's rotation and its revolution around the sun. The effects are small so you don't feel them, but if you watch for a long, long time, you can detect changes of speed and direction that are best explained by these causes that we do not easily perceive.
How is wind energy and thermal energy related?
Both are the inertial energy of moving molecules. Thermal energy being random and wind energy being more ordered in direction.
How does an object behave if there are no forces acting on it?
The simple answer is that the object moves at a constant velocity (or remains stationary if it wasn't moving). This is known as Newton's First Law.However, Newton's Laws only apply in what is known as an inertial reference frame. Unfortunately, the definition of an inertial reference frame is a reference frame in which Newton's Laws apply. But, in principle, if you took an object far away from everything, then the simple answer above would, in principle, be correct.
How can you tell that an object is in motion?
it would be in the process of moving It depends on your perspective. If you were also moving in the same direction and at the same speed, is the object moving?
Is the satellites move in inertial frame?
Yes, a satellite orbiting a planet, such as Earth, is in an inertial reference frame. This is puzzling because the satellite is not moving in a straight line. Doesn't that mean it is accelerated to curve its path circling the Earth? The only reliable way of determining whether or not you are in an inertial frame is by detection of a force that prevents you from floating freely in your space ship. If you are floating freely, as you would in the orbiting International Space Station (a big satellite), then you are in an inertial frame. If you are able to sit or stand unrestrained in your space ship then the ship is undergoing some sort of an acceleration. This really has nothing to do with your trajectory since, for example, you can speed up or slow down on a "straight line" and feel the force of acceleration. The only straight line that can be used to define an inertial frame is the geodesic path described in Einstein's General Theory of Relativity.
Can movement only be measured with reference that is assumed to be fixed in pace?
No, Einstein proved that all inertial frames are equally valid references. You don't have to assume it's "fixed in place" or even know exactly how it's moving relative to any other frame as long as you know how the measured object is moving relative to the chosen reference frame.
What is Einstiens law of relativity?
Two postulates of relativity: 1: laws of physics are same for all observers, despite how fast they are moving with respect to each other. 2: speed of light has same value measured by all observers despite how fast they are moving relative to each other. Special relativity is valid for inertial reference frames (frame where newton's 1st law holds) and explains time dilation (phenomena in which a clock moving [with v close to c] in respect to a clock in an inertial reference frame, appears to be running slower) and length contraction (length of an object moving at a v close to c appears to be contracted [in the direction of it's motion], for an observer in an inertial reference frame) relativistic modifications need to be made for kinematics if velocity is close enough to c. these modifications involve the gamma factor. General relativity is about the principle of equivalence: the effects of a gravitational field are equivalent to acceleration. this basically leads to the idea that gravity can bend spacetime, which means all objects (including light) follow geodesic paths. General rel expands special rel to include accelerating frames of reference
How can a piece of chalk be 8 units long and 3 units long and be the same answer?
Well it depends on the inertial reference frame you're in. For example, due to relativistic theories of length contraction, when moving at extreme velocities (close to the speed of light), objects outside appear smaller so the piece of chalk can be both 8 units long and 3 units long depending on the inertial reference frame being considered.
When tow people are pushing on a desk in same direction as reference direction what will happen to object?
If the combined force is enough to overcome the force of friction, the desk will start moving.
How can you tell if another object is moving and your also moving?
Any uniformly moving observer in an inertial frame, cannot determine his "absolute" state of motion by a co-moving experimental arrangement...Principal of Relativity.
