While skiing in Mammoth, Mrs. Steward has a speed of 15m/s at the bottom of the slope. She slows to a stop while traveling a distance of 15m. If she has a mass of 75kg with all her gear on, what is the magnitude and direction of the stopping force? What do we call this stopping forces?

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

a.   mass number from atomic number

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.