How do the numbers of atoms of each element compare before and after the reaction? Why do you think this is?

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?