When are you most aware of your motion in a moving vehicle: when it is moving steadily in a straight line or when it is accelerating? if you were in a car that moved with absolutely constant velocity (no bumps at all), would you be aware of the motion? a) accelerating. you would not be aware of the motion if you did not look outside the car. b) accelerating. you would be aware of the motion because humans can sense speed. c) moving steadily in a straight line. you would be aware of the motion because you can feel velocity even in a closed car. d) moving steadily in a straight line. you would be aware of the motion because you can feel the speed.

A) Accelerating. You would not be aware of the motion if you did not look outside the car

Explanation:

Since human cannot sense the motion (unless visually), but the inertia force caused due to the acceleration of the motion. So if you are in a car with constant velocity, there's no acceleration and no inertia force, you would not be able to sense the motion at all unless you look outside.

conduction, convection, radiation

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.