a 50 kg box is pushed to the left using 500 N, the frictional force on the box is 100 N what is the acceleration on the box?

First thing's first, we need to find the Net Force of the system in order to solve for acceleration. Gravity and Normal Force cancel out, so we don't really have to worry about anything on the y-axis. However, looking at the x-axis, we see two forces: the Force of the push and Frictional Force.

This means that:

= 500 - 100

= 400 (N)

Recall that Force = Mass * Acceleration. Since we have the Force and Mass, we can easily solve for Accel:

F = ma

a =

Plug the net force and mass into the equation:  

a =

a =

a = 8 (m/)

The box's acceleration is 8 m/

If you have any questions about how I got to the answer, just ask :)

iron would move it is magnetic there is a mag field around the current in the wire