You need a force greater than the weight of the 40 kilogram mass to lift it. Here's how to calculate that:

* Weight = Mass x Gravity

* Gravity (on Earth) = 9.8 m/s²

* Weight = 40 kg x 9.8 m/s² = 392 Newtons (N)

Therefore, you need a force greater than 392 Newtons to lift a 40 kilogram mass.

Important Note: This is the minimum force required to *just* lift the object. To actually lift it with any noticeable acceleration, you would need to exert a force even greater than 392 Newtons.