Can an airbag be activated by a powerful kick (eg. jumping side kick)?
If you are driving an early 1980’s car with airbags, then the little metal ball in the little tube behind the grill was forced to push the spring all the way back to the contact which allowed electricity to flow to set off the ignitors (tiny explosive devices) which started the burning of material that quickly produced hot gasses that filled the air bag.
Since I could set off an airbag with a hammer to the grill (the idea is a rock, thrown up by the tires of a vehicle in front of you) this type of sensor is not allowed nor has been for about 35 years.
But, as Phillip notes, modern airbags generally require much more force, and often only deploy at higher speeds.
No, at least not modern airbags.
Since the activation depends on several sensors switching at the same time, and they typically need that the whole car is accelerated with 3-5g including the corresponding deformation of the frame, no force a human can produce will suffice due to the inertia of the immense mass of the car. Kicking the steering wheel won't do much.
Just to put this into perspective, in order to accelerate a very light car of one metric ton so that the sensors go off, you'd need to produce at a minimum 29.34 kN (1000 kg, 3g acceleration) while a very powerful kick seems to typically top out at about 2 kN. That doesn't even count in roll resistance and that most of the force won't go into an actual acceleration of the car but rather into deformation of the front (or back).
Long story short, a kick can produce not even a tenth of the force needed to accelerate a very small car so that its airbags go off.