Question

mission nl3: unbalanced forces and accelerations
the oil drop diagram shows the motion of a leftward-moving object. which force diagrams are consistent with the oil drop diagram? (the arrows represent forces; arrow length represents the size of the force.) include all that apply.
oil drop diagram and force diagrams a - e omitted as per instruction

Explanation:

1. Analyze the oil drop diagram: The object moves left, and the spacing between drops decreases. This means the object's speed is decreasing (decelerating) as it moves left, so acceleration is directed rightward (opposite to motion).
2. Relate acceleration to net force: By Newton's second law, net force acts in the same direction as acceleration, so net force must be rightward.
3. Evaluate each force diagram:

• A: Net force is leftward (opposite needed). Incorrect.
• B: Rightward force is larger than leftward; net force rightward. Correct.
• C: Equal left/right forces; net force zero (no acceleration). Incorrect.
• D: Leftward force is larger than rightward; net force leftward. Incorrect.
• E: Up/down forces balance; net force zero (no acceleration). Incorrect.

Answer:

B. The force diagram with a larger rightward force, balanced vertical forces