0 Members and 1 Guest are viewing this topic.
I take it that if the energy to raise this 5Kg mass has come from an Earth bound source the Earth has also lost the same amount of relativistic mass.Due to the daughter atoms from the spit uranium atoms having less mass
I would call that force, the force of the bus was greater than my inertia,
And that means in plain English?
The higher you lift an object, the heavier it becomes relative to the ground, terminal velocity is the weight maximum limit and at its relativistic heaviest.
Force is rate of change of inertia. You can't equate force with inertia.
Quote from: Thebox on 27/03/2016 02:38:35The higher you lift an object, the heavier it becomes relative to the ground, terminal velocity is the weight maximum limit and at its relativistic heaviest. Not true. The higher you lift an object, the less it weighs because the gravitational field is divergent. F= GmM/r2, if you recall.Terminal velocity depends on the shape of a falling object, and the density and viscosity of the medium through which it falls. It's about 150 mph for a human body, from any height above a couple of hundred feet. I don't think this is what you meant. You can calculate ground impact velocity (ignoring air resistance) by putting mgh = ½mv2, i.e. by assuming that energy is conserved. But even though the calculation is simple and the answer is always correct, I'm sure you will not believe it.
Quote from: chiralSPO on 27/03/2016 11:45:53No. You are on the wrong track here. I am not quite sure what track you are on, but it ain't right... A bit contradictory mate, you say you are not sure what I am talking about yet you claim it is not right.
No. You are on the wrong track here. I am not quite sure what track you are on, but it ain't right...
QuoteF = m*a means force = mass times accelerationforce is in units of Newtons (N = kg*m*s–2)mass is in units of kilograms (kg)acceleration is in units of m*s–2Huh? why are you putting - 2
F = m*a means force = mass times accelerationforce is in units of Newtons (N = kg*m*s–2)mass is in units of kilograms (kg)acceleration is in units of m*s–2
Force = mass times accelerationforce is measured weight , in Newtons, a=9.81m/s2
which means that for every meter falling it increases its acceleration *2
You lost me , I know what F=ma means, or I thought I did. Let me confirm, for 1kg mass we put 0.1 in the calculation for mass?F= 0.1 * aacceleration is 9.81m/s2for the first meter 9.81m/s2nd meter 9.81m/s*23rd meter 9.81m/s*3?
an object at rest on Earth has inertia, this inertia is created by the linear force of gravity
vt = v0 + a*t2If in object is initially not moving (v0 = 0) and then begins to fall at a = 9.81 m/s2it will be moving at 9.81 m/s at 1 second, 39.24 m/s at 2 seconds, 88.29 m/s at 3 seconds, 156.96 m/s at 4 seconds...
Quote from: evan_au on 28/03/2016 22:01:19vt = v0 + a*t2If in object is initially not moving (v0 = 0) and then begins to fall at a = 9.81 m/s2it will be moving at 9.81 m/s at 1 second, 39.24 m/s at 2 seconds, 88.29 m/s at 3 seconds, 156.96 m/s at 4 seconds...The correct formula is vt = v0 + a*thence at 1 second, v=9.81 m/s, at 2 seconds v=19.62, and so on.or if you want to calculate distance st = s0 + v0*t + ½*a*t²
no. For 1 kg, F = 1*a (and for 23 kg, F = 23*a)
So, to answer the original question, (1) k.e. is a scalar equal to ½mv2 and (2) we find that if an object falls from rest through a height h in vacuo, gh = ½v2. Which is not at all surprising for those who understand the meaning of "acceleration". The interesting bit is the discovery (phenomenologically attributed to Galileo, maths by Newton) that g = GM/r2 near the surface of a large spherical planet. Like it or lump it, Mr Box.
Energy only "exists" in the minds of the child-hating idiots who write the National Curriculum. For the rest of us, it is a number that tells us something about things that happen.