A box with a mass of 15.0 kg is being pushed on a level surface with a horizontally applied force. It just starts to slide when 40.0 N is applied
and will continue to slide if 35.0 Nis applied to the box. What is the
coefficient of static friction (us) of these surfaces? *

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.

answeralert drivers who drift off the road;