/sci/ - Science & Math

>>14964103
Bruh.

a=V/t is wrong. It's a=dV/dt.

All high school textbooks that say a=V/t assume that by V everyone understands dV.
Imagine that a car is moving constantly at 5m/s.
At t=0 it starts to accelerate by 1m/s^2.
At t = 2 it stops accelerating.

According to your formula V = a*t
V = 1*2 = 2

While obviously it's V = 7

Your formula assumes that the car was immobile prior to acceleration. When that is the case the change in velocity is equal to the velocity. This is only a special case. Force has nothing to do with velocity. Only with the change or rate of change of velocity.

Constant speed => dV = 0 => dV/dt = 0 =>
a = 0

which means F = 0

V is not in F=ma. There is just its rate of change.