- #1
JLT
- 52
- 4
For collisions between particles, Fdt goes to zero while Fdx does not
F = mdv/dt
mv + Fdt = mv
if you have two particles colliding
mva + mvb +Fdt = mva'+mvb'
in the above case, Fdt goes away as there are equal and opposite forces between the two particles during the collision, linear momentum is conserved
but
F = m(dv/dt)(dx/dx)=m(dx/dt)(dv/dx)=mv(dv/dx)
Fdx = mvdv
KE1 + Fdx = KE2
Fdx does not go away during a collision.
Why does Fdt go away during collisions while Fdx does not?
F = mdv/dt
mv + Fdt = mv
if you have two particles colliding
mva + mvb +Fdt = mva'+mvb'
in the above case, Fdt goes away as there are equal and opposite forces between the two particles during the collision, linear momentum is conserved
but
F = m(dv/dt)(dx/dx)=m(dx/dt)(dv/dx)=mv(dv/dx)
Fdx = mvdv
KE1 + Fdx = KE2
Fdx does not go away during a collision.
Why does Fdt go away during collisions while Fdx does not?