Physics Help Forum I need a formula for Horizontal force...

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

Aug 22nd 2017, 02:25 PM   #11
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 Originally Posted by studiot Applying a vertical force ? How? By tying it to Saturn C rocket? If you would like to reply to my previous post you could get some real help.
The ball appears in space and then a horizontal and vertical force are immediately applied to it through code (it's a video game).

Aug 22nd 2017, 02:28 PM   #12
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 Originally Posted by horrorhippo The ball appears in space and then a horizontal and vertical force are immediately applied to it through code (it's a video game).
So?

Do your imaginary game forces not obey the laws of Physics?

If so what laws do they obey? I am not a mind reader. Specify your problem properly.

Aug 22nd 2017, 02:32 PM   #13
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 Originally Posted by studiot So? Do your imaginary game forces not obey the laws of Physics? If so what laws do they obey? I am not a mind reader. Specify your problem properly.
I don't know what other information I can provide/you need me to provide.

Gravity is applied. No air resistance or anything like that. Just a vertical force in the y direction and a horizontal force in the x direction. The ball has a mass.

Aug 22nd 2017, 02:45 PM   #14
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 Originally Posted by horrorhippo I don't know what other information I can provide/you need me to provide. Gravity is applied. No air resistance or anything like that. Just a vertical force in the y direction and a horizontal force in the x direction. The ball has a mass.
How "hard" does the bat hit the ball? Is it variable? You say you want the ball to go thru (x,y) but that's just fitting an inverted (upside down) parabola through the points (x,y) and the initial ball position but that doesn't give us how high the ball goes vertically. You can calculate that from the ball's initial vertical velocity so in theory you could work with just that. However that answer feel's a little contrived and I'm not sure how physical it would be for your game.

 Aug 22nd 2017, 02:48 PM #15 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 995 So first question Did you understand the Physics of what I was saying about momentum, velocity and projection angle?
Aug 22nd 2017, 02:55 PM   #16
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 Originally Posted by kiwiheretic How "hard" does the bat hit the ball? Is it variable? You say you want the ball to go thru (x,y) but that's just fitting an inverted (upside down) parabola through the points (x,y) and the initial ball position but that doesn't give us how high the ball goes vertically. You can calculate that from the ball's initial vertical velocity so in theory you could work with just that. However that answer feel's a little contrived and I'm not sure how physical it would be for your game.
Ok I'll try this again.

Here is a diagram:

The ball is created at a point in space [x1, y1] and a vertical and horizontal force are immediately applied to it so it flies in an arc like shown above (simulating a pitching machine at a batting cage). It has a mass that we know, and gravity is constant. I want to make sure it always passes through point [x2,y2] regardless of what vertical force I choose to apply to it so I need an equation to find the horizontal force.

There is no bat hitting anything.

 Aug 22nd 2017, 03:04 PM #17 Senior Member   Join Date: Nov 2013 Location: New Zealand Posts: 550 Does y1 = y2? Not that I care too much about that. So is fHorizontal and fVertical the horizontal and vertical initial forces on the ball? Last edited by kiwiheretic; Aug 22nd 2017 at 03:06 PM. Reason: clarification
Aug 22nd 2017, 03:06 PM   #18
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 Originally Posted by kiwiheretic Does y1 = y2?
No.

 Aug 22nd 2017, 03:07 PM #19 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 995 I fully understood what you said the first time, but it refers to impossible physics on the planet Zog. So you are just wasting everyone's time since you are not listening to what we are saying. Goodnight.
Aug 22nd 2017, 03:11 PM   #20
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 Originally Posted by studiot I fully understood what you said the first time, but it refers to impossible physics on the planet Zog. So you are just wasting everyone's time since you are not listening to what we are saying. Goodnight.
I'm sorry I just don't understand, which is why I came here for help.

It's velocity is reliant on the forces being applied to it, is it not? And the angle it's being shot at is also reliant on the horizontal force... so I don't really know what else I can provide you.

Can you at least explain why it's impossible physics?

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