physics question

I'm 16 and I was wondering, If a car or similar wheeled vehicular object was accelerating at +50 mph-per second and you suddenly cut the power, would it keep accelerating for a few seconds or would it what, I don't understand what would make it keep accelerating for a short time and I can't imagine it would immediately stop its acceleration

 

yeah, i wouldn't trust the kag community about academics

 

So if it was accelerating at +50 mph-per second and cut the power and someone was in it, they would slam they're head on the dash due to the acceleration change

 

I don't get it, if your accelerating at +50 mph a second and it immediately stops accelerating shouldn't the change cause something similar?

 

starting with "I'm 16" wasn't a fortunate beginning as you have been explained Newton physics by that age

also what Kouji said

a=delta v/delta t
if delta v<0
then a<0 as well
if your acceleration is lower than 0 it basically means that the object is slowing down, it doesn't stop

alternatively:
F=ma
a=F/m
somewhat answers your question as well (since your F=0 when power is cut off)
Although it's a scrappy explanation because, as Kouji said, the car would be slowing down because of friction

if there was no friction at all (eg. you have a magic car that's driving in vacuum) it would maintain the speed it had while you cut off the power (Newton's I law) and that's where you could apply the a=F/m formula


i think all i said is right but, it often isn't so feel free to correct me



oh god i got ninja'd by a couple of people, did you sleep through every single physics class

 

Acceleration /force has already been explained here, so I will just continue a bit.

In physics jerk is a measure of acceleration per time such that j=a/t.

Acceleration is felt by a body as a force, hence pressure.

Jerk can be felt as the change in this pressure. For example a passenger in an accelerating vehicle with zero jerk will feel a constant force from the seat on his or her body; whereas positive jerk will be felt as increasing force on the body, and negative jerk as decreasing force on the body.

In your example, a passenger is traveling with an acceleration of 50m/s/s. At an instant this acceleration drops to zero and then becomes negative. So lets say 1 second after the power is cut, the acceleration is -5m/s/s. Then the Jerk over this 1 second would be -55m/s/s/s.

So you would feel a rapid decrease of pressure on your body over that 1 second.