Object flying off screen by itself

Getting Started Newbie Questions
#1

I had to resize the graphics on my app because I had set them up all wrong.  I have everything fixed except for one thing.  When I try to resize my newImageSheet I can get the image to the size I want but then when I start the game the object just flies off the screen by itself without even being touched.  I don’t understand why changing the size of it would do this. Any suggestions?

Code before:

    p_options = 

    {

        – Required params

        width = 80,

        height = 42,

        numFrames = 2,

        – content scaling

        sheetContentWidth = 160,

        sheetContentHeight = 42,

    }

    playerSheet = graphics.newImageSheet( “bird.png”, p_options )

    player = display.newSprite( playerSheet, { name=“player”, start=1, count=2, time=500 } )

    player.anchorX = 0.5

    player.anchorY = 0.5

    player.x = display.contentCenterX

    player.y = display.contentCenterY

    physics.addBody(player, “static”, {density=.1, bounce=0.1, friction=1})

    player:applyForce(0, -300, player.x, player.y)

    player:play()

    screenGroup:insert(player)

Cod after:

    p_options = 

    {

        – Required params

        width = 40,

        height = 21,

        numFrames = 2,

        – content scaling

        sheetContentWidth = 80,

        sheetContentHeight = 21,

    }

    playerSheet = graphics.newImageSheet( “bird.png”, p_options )

    player = display.newSprite( playerSheet, { name=“player”, start=1, count=2, time=500 } )

    player.anchorX = 0.5

    player.anchorY = 0.5

    player.x = display.contentCenterX

    player.y = display.contentCenterY

    physics.addBody(player, “static”, {density=.1, bounce=0.1, friction=1})

    player:applyForce(0, -300, player.x, player.y)

    player:play()

    screenGroup:insert(player)

#2

The size of an object relates directly to its mass which relates directly to the force required to move that object.

In your first code snippet, the body is 4x the size of the next snippet.  Thus, in the next snippet, it is as if you are applying 4x the force.

Put another way, the second snippet creates a body with 1/4 the mass of the first snippet.

Lest there be any confusion I get 4x from 2x width * 2x height.

#3

Ah thank you! That fixed it!

#4

The size of an object relates directly to its mass which relates directly to the force required to move that object.

In your first code snippet, the body is 4x the size of the next snippet.  Thus, in the next snippet, it is as if you are applying 4x the force.

Put another way, the second snippet creates a body with 1/4 the mass of the first snippet.

Lest there be any confusion I get 4x from 2x width * 2x height.

#5

Ah thank you! That fixed it!