  We calculate the electroweak properties of nucleons and hyperons in a
relativistic constituent quark model using the light-front formalism. The
parameters of the model, namely the constituent quark mass and the confinement
scale, can be uniquely chosen for both the electromagnetic and weak
experimental data. A consistent physical picture of the $qqq$ system appears in
this work with a symmetric nucleon wave function and an asymmetric hyperon wave
function. Only for the strangeness-changing weak decays do we need nontrivial
form factors of the constituent quark.
