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Answer:
To identify the two forces acting on objects in pictures (or diagrams), we generally consider the most common forces that affect objects:
1. **Gravity (Weight)**: This force acts downward, towards the center of the Earth. It's the force that gives objects their weight. In diagrams, it is typically represented as a vector pointing downwards.
2. **Normal Force**: This is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface. If the object is on a flat horizontal surface, the normal force points upward.
Other forces that might appear depending on the context include friction (acting parallel to the surface and opposing motion), tension (in a rope or cable), and applied forces (like a push or pull).
If you have specific pictures or diagrams, these forces can be identified by looking for these typical interactions. Would you like to discuss specific examples or pictures?