Example: Sunlight enters the top of the earth's atmosphere with an electric field whose RMS value is Erms = 720 N/C. Find
(a) the average intensity of this electromagnetic wave ​

see earlier

measuring things 1 litre of water

force tends to be low and long diustance masses are high

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.