Final answer:
The bug experiences a greater effect from the impact when hitting the windshield of a bus due to its smaller mass and the proportionally higher acceleration, despite the force being equal on both the bug and the bus.
Step-by-step explanation:
When a bug collides with the windshield of a bus, the force of impact experienced by both the bug and the windshield is equal in magnitude, according to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. However, the effect of this force is greater on the bug than on the bus due to the bug's much smaller mass and the resulting acceleration being much higher for the bug (F=ma, where F is force, m is mass, and a is acceleration). Consequently, the bug is the one that ends up getting squashed, even though the same magnitude of force is also acting on the much more massive bus.