Air bags were placed in cars in order to protect the passengers from impact. however, in some cases, passengers receive injuries from the air bags. explain one reason why this happens. *in relation to physics (impulse, momentum unit) !

Consider the equation relating impulse (change in momentum) to force:

F = Δp/Δt

The average force exerted on your body when you are slowed by an airbag is your impulse divided by the time it takes to slow you down. The airbag can't change your initial momentum in a collision, but where they can vary in the time interval it takes to stop you.

Airbags in general should take some time to slow you down, resulting in a force exerted on your body that will probably be uncomfortable but nothing life-threatening. If the airbag stops you in a short time interval, the force exerted on your body can be quite high, which can lead to injury.

iron would move it is magnetic there is a mag field around the current in the wire

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia