# Simple True/False Question

The maximum height reached by a projectile depends on the horizontal velocity component.

True or False

Here's my reasoning - the maximum height is reached when y=0, so in that case the maximum height depends on the horizontal velocity component. I'd like to hear your guys thoughts on this. I only get 1 shot at getting this right so I wanna hear what you guys think!

dextercioby
Homework Helper
FALSE.Can u see why?

Daniel.

is it because of gravity?

dextercioby
Homework Helper
Since it's the only force acting on the projectile (neglecting Magnus effect,aerodynamic force,Stokes force,Coriolis force) i'd say yes...

Daniel.

cepheid
Staff Emeritus
Gold Member
Yeah....the KEY point of projectile motion as modelled in school is that horizontal and vertical components of the projectile's velocity are independent. That's what they want you to remember.

alright thx guys

Tide
Homework Helper
dextercioby said:
Since it's the only force acting on the projectile (neglecting Magnus effect,aerodynamic force,Stokes force,Coriolis force) i'd say yes...

Daniel.

You left out the finite size of the planet which brings the inverse square law into play! :-)

dextercioby
Homework Helper
He asked me about gravity,not the inverse square law and where it comes from...And besides,everything reduces to solving Einstein's equations,right...??

Daniel.

Tide said:
You left out the finite size of the planet which brings the inverse square law into play! :-)

and to continue dexter's nitpicking, he also forgot to incorporate the fact that the earth is not a perfect sphere...Where are them Legendre-terms in the potential ???

marlon

dextercioby
Homework Helper
"The maximum height reached by a projectile depends on the horizontal velocity component."

Do you see any Earth nonspherical,here???

Daniel.

do you see any coriolis,blablabla here ???

gravity also changes when you take into account a non-spherical earth

marlon

dextercioby