The paper considers the second order dynamic equation on time scale \(\mathbb{T}\) \[ x^{\Delta\Delta}(t)+p(t)f(x(\sigma(t)))=0, \] where \(p\in C(\mathbb{T},\mathbb{R}), \) \(f:\mathbb{R}\to \mathbb{R}\) is a continuously differentiable function with superlinearity such that \(f'(x)>0\), \(xf(x)>0\) for \(x\not=0\). Two sufficient conditions for the equation to be oscillatory are given.