Which statement best explains why the overall charge on an atom is zero? a. the positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud. b. the positive charge of the protons in the nucleus equals the negative charge in the electron cloud. c. the negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud. d. the negative charge of the protons in the nucleus equals the positive charge in the electron cloud.

The positive charge of the protons in the nucleus equals the negative charge in the electron cloud.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.