Physics - Applying Impulses

Questions
1

I am trying to raise a ball when I hold down on the screen and have it fall when I release, however I can’t make it smooth and at a gentle speed. My code is to fast and sudden. I am using physics and impulses to do this. Could someone help make this more smooth? Here is my code:



-- Use this function to perform your initial setup
function setup()
    --ground=physics.body(EDGE,vec2(0,0),vec2(WIDTH,0))

fingers=0      
    box=physics.body(CIRCLE,50)
    box.x=400
    box.y=400
    box.sleepingAllowed=false
    physics.gravity(0,-100)
end

function touched(touch)
    
    if(touch.state == BEGAN)then
        fingers = fingers + 1
    end
    
    if(touch.state==ENDED)then
        fingers = fingers - 1
    end
    
    if(fingers>0)then
        box:applyForce(vec2(0,800))
    end
end

function drawObject(obj)
    ellipse(box.x,box.y,50)
 end

-- This function gets called once every frame
function draw()
    background(0,0,0)
    drawObject(box)
end
2 


-- Use this function to perform your initial setup
function setup()
    --ground=physics.body(EDGE,vec2(0,0),vec2(WIDTH,0))

fingers=0      
    box=physics.body(CIRCLE,50)
    box.x=400
    box.y=400
    box.sleepingAllowed=false
    physics.gravity(0,-100)
end

function touched(touch)

    if(touch.state == BEGAN)then
        fingers = fingers + 1
    end

    if(touch.state==ENDED)then
        fingers = fingers - 1
    end

end

function drawObject(obj)
    if(fingers>0)then
        box:applyForce(vec2(0,100))
    end
    ellipse(box.x,box.y,50)
 end

-- This function gets called once every frame
function draw()
    background(0,0,0)
    drawObject(box)
end
3

@austinmccoy Here’s something I pulled from one of my projects. Touch the screen for upward thrust. Move you finger left or right to move left or right.


displayMode(FULLSCREEN)
supportedOrientations(PORTRAIT_ANY)

function setup()
    vel=vec2(0,0)
    b=physics.body(CIRCLE,15)
    b.x=WIDTH/2-100
    b.y=HEIGHT-50
end

function draw()
    background(40, 40, 50)
    sprite("Tyrian Remastered:Part H",b.x,b.y)
    if flame then   -- show lander flame
        sprite("Tyrian Remastered:Flame 1",b.x,b.y-20,15,-30)
    end
    lv=b.linearVelocity
    if up then
        vel.y=vel.y+.5
        b.linearVelocity=lv+vec2(vel.x,vel.y)
    end
end

function touched(t)
    if t.state==BEGAN or t.state==MOVING and lv~=nil then
        up=true
        flame=true
        vel.x=vel.x+t.deltaX/10
    end
    if t.state==ENDED then
        up=false
        flame=false
        vel=vec2(0,0)
    end
end
4

That Great! Thanks for you help!