Understanding Impulse

Impulse is the change in momentum of an object. It's calculated as:

* Impulse (J) = Force (F) x Time (Δt)

The Problem

We have a 1.0 kg object resting on your foot, which means it's applying a force due to gravity. However, the object is *at rest*, meaning its *velocity* is zero. Since there's no change in velocity, there's no change in momentum.

Conclusion

Because the object isn't moving, the impulse exerted is zero.

Important Note: If the object were to fall onto your foot (giving it a velocity and therefore a change in momentum), then the impulse would be non-zero and we could calculate it.