Difference in Strains

[Cowasjee_Sanaea_3E]

I still don't quite understand the different between steric, angle, and torsional strain?

[Karan Ishii 3E]

Steric– strain between non bonded atoms that occupy the same space
ex) flag pole hydrogens in the boat conformation
Torsional strain– strain due to rotation where there is a lot of repulsion. a force opposes rotation of a part of a molecule about a bond
ex) CH3-CH3 eclipsed
bond strain- when a bond is not at its ideal angle
ex) cyclopropane at 60 degrees