As the moon circles the earth, the shape of the moon appears to change. the shape varies from a full moon, when the earth is between the sun and the moon, to , when the moon is between the sun and the earth.

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.

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..

at right angles to each other