In this video, the puck sits on a room-temperature aluminum ramp. warmed by the ramp, the dry ice sublimates off the bottom of the puck and forms a thin layer of co2 gas that levitates the puck, allowing it to slide down the ramp with very low friction. this process also creates a cool and mysterious smoky appearance of the puck, perhaps contributing to einstein's excitement.

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.

you can cut your hand off if your not