The scenario that describes an object experiencing zero net force is:
b. a balloon floating upward at a constant velocity.
In this case, the balloon is moving upward at a constant velocity, which means that the forces acting on it (such as buoyancy and gravity) are balanced, resulting in a net force of zero.
In contrast:
- a. a rock falling off a cliff: is experiencing a net force due to gravity.
- c. a plane landing on a runway: typically experiences forces such as lift, thrust, and drag that are not balanced until it comes to a complete stop.
- d. a car driving around a circular race track: is undergoing a centripetal acceleration, which indicates a net force acting toward the center of the circular path.
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