The force acting on the package of nails is the force of gravity.

Here's how to calculate it:

* Force of Gravity (Weight): This is calculated using the formula:

* Force (F) = mass (m) * acceleration due to gravity (g)

* Mass: You've given the mass as 1 kg.

* Acceleration due to gravity (g): This is approximately 9.8 m/s² on Earth.

Calculation:

F = 1 kg * 9.8 m/s² = 9.8 N

Therefore, the force acting on the package of nails is approximately 9.8 Newtons.