The correct answer is A: gravity. The force that causes Kendra to fall from the monkey bars is gravity. It is the downward force of attraction between her and the Earth, and when she can no longer counteract this force, she falls.
The force that causes Kendra to fall from the monkey bars is gravity (A). Gravity is the force of attraction between two objects with mass. In this case, the Earth's gravitational force pulls Kendra downwards, causing her to fall.
Here's a step-by-step explanation:
1. Gravity:
Gravity is a force that pulls objects towards the center of the Earth. It is responsible for keeping us grounded and affects everything on Earth. The force of gravity depends on the mass of the objects involved. The greater the mass, the stronger the gravitational force.
2. Kendra hanging on the monkey bars:
When Kendra hangs from the monkey bars, she is exerting an upward force on the bars to support her weight. This force counters the downward force of gravity, allowing her to stay suspended.
3. Increasing difficulty:
As Kendra continues to hang on the monkey bars, her muscles get tired and she starts to lose strength. The upward force she is exerting on the bars decreases, making it harder for her to counteract the force of gravity.
4. Falling to the ground:
Eventually, Kendra reaches a point where she can no longer exert enough force to counteract gravity. At this point, gravity becomes the dominant force, pulling her downwards. As a result, she falls to the ground.
Therefore, the correct answer is A: gravity.