We need to know different types of van der Waal's forces.
There are three different van der Waal's forces.
van der Waal's force is driven by induced electrical interactions between two or more atoms or molecules. Though it is very weal in nature, this force is ultimately responsible for liquefaction and solidification of gases.
van der Waal's forces are non-directional. The strength of this force increases as the size of the units linked increases.
There are three types of van der Waal's interactions. They are- (i) Ion-dipole interaction, (ii) dipole-dipole interaction and (iii) hydrogen bond.
Ion dipole interaction is weakest among these three, dipole-dipole interactions are medium and hydrogen bonds are strong interactions.
Answer:
A. Atoms randomly crashing into each other
E. The force of one object pushing against the force of another object.
Explanation:
Forces can be classified into two categories based upon the the mode of transfer or application:
1. Contact forces
2. Non-contact forces
Contact forces are the ones which require the physical contact of the matter to get transferred and tend to create the affect. Whereas non-contact forces have the field property which transfers the affect of force from one point to another without any physical contact of the matter or the medium.
- Atoms crashing onto each other have some mass and velocity which upon collision impacts the other atoms exerts a contact force.
- The interaction between the charged particles due to their charges is always due to the electric field be it electron or proton, be it within an atom or out of an atom.
- The force between any two objects pushing or pulling each other is also possible only due to contact.
It's the quality of shining by reflecting light