A refrigerator is loaded into the back of a pickup truck. Explain why the refrigerator seems to topple backward when the truck accelerates forward

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

so easy. just google the electromagnetic waves and it’ll pop up.