Question

When an object is in motion.
Does it instantly get its speed? Or does it need time to reach to that speed?

Answer 1

Lets say you had a object moving at 50km/s.
When it was at rest (0 km/s) to 50km(s). Did it take a long time to accelerate to reach to this speed?

I feel it depends.
Because in some cases an object can instantly! accelerate to that speed.
While another object needs more time to do so.

Answer 2

@TuringTest
@Jemurray3 @experimentX

I feel it all depends, probably on the force?

Answer 3

Objects take time to accelerate to a certain speed (graphs of velocity versus time are continuous) and acceleration is directly proportional to force, and inversely proportional to the mass of the object accelerating.

Answer 4

Hey @TuringTest :)
Agreed. But the acceleration can be fast right? I mean if the force is quite high enough. The acceleration can be super fast to a point where it might to be instant! Even faster than a blink of an eye! :P

Sometimes I feel there is no acceleration at all because of how fast it happens!

Answer 5

*might seem "instant".*

Answer 6

That is a result of the limitation of your brain to process a certain number of frames per minute, not a discontinuity in a velocity versus time graph. As far as we know (aside from perhaps unknown quantum things) The classical model is that velocity is continuous, i.e. a graph of v vs t has no vertical lines.

Answer 7

"seem" is the word, yes. By now you should know that not all physics is as it seems.

Answer 8

Physics: "More than meets the eye".