In two inertial frame conclusion: 1.time interval is absolute t=t △t=△t 2. space separation is absolute x=x'+ut Vl=Vl,tiV,=vm,tiV for:△t=0so:△x=△ 3. the invariability of Newton's I aw F=ma=maF=F′F'=ma
In two inertial frame a a = conclusion: 1.time interval is absolute t=t t = t 2.space separation is absolute x = x + ut x = x + ut = x + ut t = 0 x = x 3.the invariability of Newton’s law F = ma = ma for： so： F = F F = ma
For example: conser vation of momentum m1v1+m2V2=m110+m2V20 Sm11+m212=m1v10+m2120 2. Gal i leo relativity P957
P957 S 1 1 2 2 1 10 2 20 m v m v m v m v + = + S 1 1 2 2 1 10 2 20 m v + m v = m v + m v For example：conservation of momentum 2.Galileo relativity
3. the troub le in electromagnetic equation 02E102E =0 C to which reference frame
3.the trouble in electromagnetic equation 1) 0 1 2 2 2 2 2 = + t E x c E C :to which reference frame ?
Even though electromagnetism shares with mechanics concept such as energy and momentum. there appear to be a major difference between these two fundamental discipl ine. the laws of mechanics look the same in all inertial frames, but electromagnetism appears to violate the general law. According to MaxwelI's equation, electromagnetic waves propagate at speed C, with no restrictions on the state of the source of detector this suggests the existence of an absolute frame for electromagnet i sm
Even though electromagnetism shares with mechanics concept such as energy and momentum.there appear to be a major difference between these two fundamental discipline.the laws of mechanics look the same in all inertial frames,but electromagnetism appears to violate the general law.According to Maxwell’s equation,electromagnetic waves propagate at speed C,with no restrictions on the state of the source of detector,this suggests the existence of an absolute frame for electromagnetism