Next, the students start a new game. Now, a fourth student is playing for the team with gray shirts: Model B:

During this new game, the ribbon moves to the left (towards the students in the gray shirts). On the model above, draw force vectors above each team that describes this movement.

i think the answer is a, hope this is right, that would be my best guess.

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.