A warehouse worker is unloading a 240. kg crate from a truck using an "ideal rope" passing over a single ideal pulley above the truck. What is the minimum horizontal frictional force that the floor must exert on the worker to keep him from slipping while slowly lifting the crate if the rope between the pulley and the man makes an angle of 25.0* with the vertical?

it would be c. predictability

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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.