A4-kg block and a 2-kg block can move on the horizontal frictionless surface. the blocks are accelerated by a+12-n force that pushes the larger block against the smaller one. determine the force that the 2-kg block exerts on the 4-kg block.
a) -4 n
b) -12 n
c) 0 n
d) +4 n
e) +8 n

Explanation:

Net external force that exerted on the block is given as

here we know that

now we have

so we have

now the force exerted by bigger block on smaller block is given as

now we know that two blocks will exert equal and opposite force on each other

so here the force exerted by 2 kg block on 4 kg block will be

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

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.