You learned that different types of forces act on objects directly and indirectly you also learn what happens when forces are balanced and unbalanced examine the diagram below showing forces acting on a box. 1. Explain how you calculate the net force in any direction on the box.
2. Suppose an upward force of 15 N is added to the box what will be the net vertical force on the box.
3. What force could be applied to the box to make the net force in the horizontal direction zero? explain.
4. Suppose a force of 25 N to the right is added to the box. what will be the net force to the right?

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.