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Two cars travel in the same direction. car #1 travels at 50 mph, car #2 travels at 75 mph and passes car #1. The relative velocity of car #2 from car #1's perspective is 25 mph.
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This means that if car #2 crashed into the back of car #1, the collision would be the same as if car #1 was parked and car #2 crashed into the back of it at 25 mph.
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∙ 12y ago
Wiki User
∙ 10y agoVelocity is relative. That means that you always have to specify the velocity of an object in comparison to some other object (the "reference frame"). Depending on the velocities of the other objects, this can of course give you different results. An "absolute velocity", in other words, asking "but what is its REAL velocity", doesn't make sense, physically, because there is no preferred reference frame - there is no possibility to measure the "real" velocity.
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∙ 8y agoA relativistic velocity is a velocity that is close to or a significant fraction of the speed of light. At such speeds Newton's laws of motion lose accuracy and it becomes necessary to use Einstein's equations of special relativity to make accurate calculations.
Wiki User
∙ 10y agothe rate of which one system changes position with another system the body is moving in fluid opposite direction the flow fluid is called relative velocity
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When is momentum conserved?
its not possible.. momentum is always conservedYou could say that momentum, in its classical definition, is not conserved at relativistic velocities. Momentum is conserved at relativistic speeds if momentum is redefined as; p = γmov where mo is the "rest (invariant) mass" and γ is the Lorentz factor, which is equal to γ = 1/√(1-ʋ2/c2) and ʋ is the relative velocity. Some argue that the relativistic mass, m' = γmo, is unnecessary, in which case the proper velocity,defined as the rate of change of object position in the observer frame with respect to time elapsed on the object clocks (its proper time) can be used.Proper velocity is equal to v = γʋ, so p = mov. mo here is the invariant mass, where before it represented the "rest mass."The problem with Newton's p = mv, is that with this definition, the total momentum does not remain constant in all isolated systems, specifically, when dealing with relativistic velocities. Mass and or velocity is dependent on the relative velocity of the observer with respect to the isolated system.It is important to add that with this new definition momentum is conserved. With that said, my point is not to argue that momentum is not always conserved but to simply offer an explanation for the relatively (no pun intended) common statement "momentum is not conserved in ALL isolated systems" which could be where the original question stems from.
What is a velocity at rest?
You add the velocity of the other frame of reference, to the object's velocity compared to that frame of reference. Example: a train moves at 60 km/h; a man in the train walks forward at 5 km/h (that is with respect to the train). Adding the two speeds gives 65 km/h. If the movements are in different directions, vector additions is needed. Basically you can add x, y, and z-components of the velocities separately. The above assumes the speeds are non-relativistic; otherwise a different and more complicated formula is required.
What is the Energy that moving things have as a result of their motion?
Kinetic energy KE = mv2 m=mass, v=velocity
Why does an object's mass increase as its velocity increases?
To answer why delves into philosophy or theology. Why is there gravity - there just is..The relativistic mass is the mass an object possesses because it travels at speeds that approach the speed of light ('c'). According to the Lorentz factor, the relativistic mass of an object increases as an object's speed approaches c as follows:.mrel = m / (1 - v2/c2)1/2.where:mrel is the relativistic massm is the rest massv is the object's velocityc is the speed of lightRelativistic mass is only significantly greater than rest mass for objects travelling faster than 0.1c, or one tenth the speed of light, or about 108,000,000 KPH (67,000,000 MPH). As you can see from the above equation, the denominator approaches zero as the object's velocity approaches the speed of light, making the relativistic mass unbounded..The Lorentz factor also applies to an object's momentum and its energy. This means not only the mass, but also an object's momentum and energy approach infinity as the object's speed approaches c. Note that, in this context, an object's rest energy is in according to the equation:.E = mc2.and this energy increases as the object's speed approaches c.
How does velocity relate to velocity?
velocity = velocity
What are the two parts of kinetic energy?
The non-relativistic equation for kinetic energy is mv^2/2 where mass is m and velocity is v. The relativistic kinetic energy equation is m/(1-(v^2/c^2))-m where m is mass, v is velocity and c is the speed of light. The two variables which determine the kinetic energy of an object are mass and velocity.
Is emc2 correct?
It is not the entire equation, but for current practical purposes, it is correct. If an object is moving at relativistic speeds, it is not correct. It requires you use relativistic mass, which is based on the velocity relative to the speed of light. It is correct for any human purposes.
Is kinetic energy a form of energy in the earth's system?
No, not at all. Kinetic energy is energy related to movement - any moving object has kinetic energy; at low (non-relativistic) speeds, the kinetic energy is calculated as 0.5 x mass x velocity squared.No, not at all. Kinetic energy is energy related to movement - any moving object has kinetic energy; at low (non-relativistic) speeds, the kinetic energy is calculated as 0.5 x mass x velocity squared.No, not at all. Kinetic energy is energy related to movement - any moving object has kinetic energy; at low (non-relativistic) speeds, the kinetic energy is calculated as 0.5 x mass x velocity squared.No, not at all. Kinetic energy is energy related to movement - any moving object has kinetic energy; at low (non-relativistic) speeds, the kinetic energy is calculated as 0.5 x mass x velocity squared.
What are the impacts of relativistic gravity on falling objects on light?
what are the impacts of relativistic gravity on falling object on ligh?
Did Albert Einstein invent time?
Time was 'invented' billions of years before Einstein. He recognized that time and velocity were related and that the speed of light was the factor that joined them. You will find more information if you google "relativistic speed".
What has the author R Hagedorn written?
R. Hagedorn has written: 'Relativistic kinematics' -- subject(s): Relativistic kinematics
When is momentum conserved?
its not possible.. momentum is always conservedYou could say that momentum, in its classical definition, is not conserved at relativistic velocities. Momentum is conserved at relativistic speeds if momentum is redefined as; p = γmov where mo is the "rest (invariant) mass" and γ is the Lorentz factor, which is equal to γ = 1/√(1-ʋ2/c2) and ʋ is the relative velocity. Some argue that the relativistic mass, m' = γmo, is unnecessary, in which case the proper velocity,defined as the rate of change of object position in the observer frame with respect to time elapsed on the object clocks (its proper time) can be used.Proper velocity is equal to v = γʋ, so p = mov. mo here is the invariant mass, where before it represented the "rest mass."The problem with Newton's p = mv, is that with this definition, the total momentum does not remain constant in all isolated systems, specifically, when dealing with relativistic velocities. Mass and or velocity is dependent on the relative velocity of the observer with respect to the isolated system.It is important to add that with this new definition momentum is conserved. With that said, my point is not to argue that momentum is not always conserved but to simply offer an explanation for the relatively (no pun intended) common statement "momentum is not conserved in ALL isolated systems" which could be where the original question stems from.
What has the author David Agmon written?
David Agmon has written: 'Classical and relativistic mechanics' -- subject(s): Mechanics, Relativistic mechanics
What is relative mass?
The phrase "relative mass" is a disambiguation of relativistic mass, which is defined by this equation:mrel = m0/ SQRT( 1 - v2/c2)m0 is the rest mass, v is the velocity of the particle, and c is the speed of light.(For more information, see Lorentz Factor and the topic of mass in Einsteins paper on Special Relativity. {Note that Einstein's convention was to refer to relativistic mass as plain ol' mand not mrel.})
What is a velocity at rest?
You add the velocity of the other frame of reference, to the object's velocity compared to that frame of reference. Example: a train moves at 60 km/h; a man in the train walks forward at 5 km/h (that is with respect to the train). Adding the two speeds gives 65 km/h. If the movements are in different directions, vector additions is needed. Basically you can add x, y, and z-components of the velocities separately. The above assumes the speeds are non-relativistic; otherwise a different and more complicated formula is required.
What object depends on the object mass and the object?
The momentum depends on the mass and velocity. Momentum = mass x velocity. The kinetic energy (motion energy) also depends on the mass and the velocity. Kinetic Energy = mass x velocity2. Since both momentum and energy depend on velocity, they are both two body properties. They depend upon both the object being observed and the observer. Observers on different paths will measure different values for the same space rock. Both properties are subject to relativistic correction.
What is the Energy that moving things have as a result of their motion?
Kinetic energy KE = mv2 m=mass, v=velocity
