The weak force causes the radioactive decay of atomic nuclei. Matter coul exist without the weak force, but it would be very different, and we would find ourselves living in a very different sort of universe. Gravity works on a much larger scale. It help us keep our feet planted on terra firma, and hold together solar systems and galaxies. Take it away and the universe would disintegrate into a thin soup of atomic particles.
Electromagnetism holds electrons in orbit around the atomi nucleus.
Without it, atoms could not exist. Without atoms, there could be no chemistry. Without chemistry, there could be no life. Inventing the Future Imagine a day without electricity. Of course, Tallahasseans who endured the wrath of Hurricane Kate don't have to imagine.