Forces occur when two objects interact; an "interacting pair"
If you push a wall it will push back at you just as hard; there is an "oposing force"
Objects on a surface area have a reaction force; moving objects experience friction.
There are three types of friction:
- Friction between solid surfaces which are gripping
- Friction between solid surfaces which are gliding past eachother
- Resistance or "drag" from fluids (liquids or gasses)
Different length arrows mean unballanced forces.
These arrows show the size and direction of forces.
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