Segunda Lei de Newton
HTML
<body>
<form id="formulario">
<fieldset>
<legend>Cálculo da segunda lei de newton</legend>
<label for="massa">massa:</label>
<input type="text" name="massa"/>
<label for="aceleracao">aceleracao:</label>
<input type="text" name="aceleracao"/>
<label for="forca">forca:</label>
<input type="text" name="forca" disabled="disabled"/>
<a href="#" onclick="calcularforca()">Calcular</a>
</fieldset>
</form>
</body>
CSS
img, table { width:165px; }
fieldset { width:140px; }
label { display:block; float:left;}
label, input {width:68px; margin:3px 0; }
th, td {border:1px solid #ccc; font-size:0.8em;}
JAVASCRIPT
calcularforca = function(){
var formulario = document.getElementById("formulario");
var massa = +formulario.massa.value;
var aceleracao = +formulario.aceleracao.value;
var forca = massa*aceleracao;
formulario.forca.value = forca.toFixed(2);
}
