What is newton’s second law of motion? give one example of newton’s second law of motion.

The second law says that the acceleration of an object is related to the net force applied in the object divided by the mass of the object.

This also can be writen as:

F = m*a

Where F is force, m is mass of the object and a is the acceleration of the object.

And example is, suppose that you have a chair that weights 10kg, if you push it with a force of 2N, then the acceleration of the chair can be obtained.

2N = 10kg*a

a = 2N/10kg = 0.2m/s^2

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.