When we look at the kinetic energy expression we see that mass decreases when velocity goes up? Is it true? A formula 1 car has a minor mass when it's running or when it's stop?
2006-09-07 01:47:12 · 13 answers · asked by ricardo.felisberto 1 in Science & Mathematics ➔ Physics
i know what are u looking for?
the relation is:
M = m * B ,
where M is final mass, m is initial mass
B is known as the BETA factor and
B = ( 1 - ( v \ c ) ^ 2 ) ^ -0.5
or B = 1 / sqrt ( 1 - ( v \ c ) ^ 2 )
where v is the velocity and c is the speed of light
so as velocity increases , mass increases and when velocity reaches speed of light ,mass becomes infinity
2006-09-07 02:23:36 · answer #1 · answered by i_Abhishek 2 · 0⤊ 0⤋
E=1/2 m v^2 This is the expression for Kinetic energy. Why should the mass increase when velocity goes up? No. It does not. Mass and velocity are independent of each other.Mass is indestructible. As per law of conservation of mass it can only change its state. Neither it can increase nor it can decrease. There is however one exception. That is when a body starts to approach speed of light. This is however only an intellectual exercise never realizable in real world. Hence NO CHANGE IN MASS ever.
2006-09-07 02:08:24 · answer #2 · answered by openpsychy 6 · 0⤊ 0⤋
The relationship has to include energy as well.
It would take twice the energy to move a 10 kg mass than a 5 kg mass to the same velocity. Or put another way, if the same amount of force is exerted on a 5 kg mass and a 10 kg mass, the 5 kg mass would attain twice the velocity.
2006-09-07 02:00:05 · answer #3 · answered by SPLATT 7 · 0⤊ 0⤋
Mass can't decrease, therefore the variables in the equation are kinetic energy and velocity. A F1 car has minimal kinetic energy at stop, so if you hit it while it isn't moving nothing will happen but if it hits you at 200kmh-1 you're going to heaven.
2006-09-07 01:53:39 · answer #4 · answered by Anonymous · 1⤊ 0⤋
when u r refering to a f1 car, the concept comes under newtonian mechanics where quantities like mass, time, length are constants.therefore its the velocity that causes the change in energy of the object.but in relativistic mechanics, velocity has an effect on the object given by the formula m=m'/(1-v^2/c^2)^1/2.
2006-09-07 04:07:12 · answer #5 · answered by poovarasi l 2 · 0⤊ 0⤋
Mass can change only if a body is moving in relativistic speed (speed close to speed of light ) but since we are talking about 'normal speed' mass cannot change, the expression shows that if a body is moving faster its kinetic energy is greater, and also if its mass is greater the Ek is greater.
2006-09-07 02:16:56 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Mass does NOT decrease as velocity and kinetic energy increase. It stays the same in Newtonian mechanics and it increases in relativistic mechanics.
2006-09-07 02:39:04 · answer #7 · answered by campbelp2002 7 · 0⤊ 0⤋
No necessary relation between mass and velocity. you could push a car and give it velocity. When the motor is running it is using fuel and losing mass whether it is moving or not.
2006-09-07 01:57:31 · answer #8 · answered by Fredrick Carley 2 · 0⤊ 0⤋
Mass times Velocity is Momentum. Inertia is the tendancy of an object to stay still or move at a constant speed.
2006-09-07 01:57:26 · answer #9 · answered by F2ni BOY 1 · 0⤊ 0⤋
inertia is a property of mass and is constant. heavier body greater inetria--> more difficult to change their kinetic energy..do not mess your mind with speed near the speed of light or something theoritical. a car has the same mass at rest and moving. mass does not change
if you relate kinetic energy to mass you will see that for certain kinetic energy you need certain speed for certain weight.
as we approach the speed of light different things happen and in my view inertia changes.
2006-09-07 02:05:43 · answer #10 · answered by Emmanuel P 3 · 0⤊ 0⤋