Bob is pushing a box across the floor at a constant speed of 1.5 m/s, applying a horizontal force whose magnitude is 50 N. Alice is pushing an identical box across the floor at a constant speed of 3 m/s, applying a horizontal force. (a) What is the magnitude of the force that Alice is applying to the box? F = N

50N

Explanation:

As both boxes are in constant speed (whatever they are), the net acceleration and also net force on them must be 0 according to Newton's 1st law. The force used to push the box is there to counter the friction force, which depends on the normal force and the weight of the box. Since both boxes are identical, their weight are the same, so as the friction force and push force.

Therefore, magnitude of the force that Alice is applying to the box would be the same at 50 N

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force