A student was riding his bicycle from north to south at a speed of 5 m/s when it started to rain. If the rain was falling vertically downward with a velocity of 10 m/s, in which direction should he hold his umbrella?

iron would move it is magnetic there is a mag field around the current in the wire

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.