Confusing (but surely simple) gravity problem

In summary, understanding the concept of gravity can be confusing, but it is actually quite simple. Gravity is the force that pulls objects towards each other, and it is affected by mass and distance. The larger the mass of an object, the stronger its gravitational pull. The farther apart two objects are, the weaker their gravitational attraction. Additionally, gravity is responsible for keeping objects in orbit around larger bodies, such as the Earth orbiting the Sun. While the mathematics and physics behind gravity may be complex, its basic principles are easy to grasp.
  • #1
vysis
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Homework Statement



An exceptional vertical jump from rest would raise a person 0.80m off the ground. To do this, what constant force would a 70kg person have to exert against the ground? Assume the person lowers himself 0.20m prior to jumping and remains in a standing position while in the air.

Homework Equations



F(net)=ma?


The Attempt at a Solution



Not a clue...
 
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  • #2
It's easy to say: "Not a clue..." :smile:

Maybe https://www.physicsforums.com/showthread.php?t=225490" will help (as it already did). It's almost the same.

You need the velocity at which man must leave the ground to reach the height of 0.8 m (you know the g). Therefore you can calculate the acceleration and the force.
 
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  • #3
Lol, thank you soooo much (again!)
 

1. What is the "confusing (but surely simple) gravity problem"?

The confusing (but surely simple) gravity problem is a hypothetical scenario that is often used to demonstrate the concept of gravity and its effects on objects in the universe. It involves a simple thought experiment where a ball is dropped from a height and the question is asked, "What happens next?"

2. Why is the gravity problem considered confusing?

The gravity problem can be considered confusing because it challenges our common-sense understanding of how objects behave. In the scenario, the ball is dropped and we expect it to fall straight down, but in reality, it follows a curved path due to the force of gravity.

3. Is there a simple solution to the gravity problem?

Yes, the solution to the gravity problem is relatively simple. The ball falls in a curved path because of the force of gravity, which pulls objects towards the center of the Earth. The path of the falling ball is a result of the balance between the downward pull of gravity and the forward motion of the ball.

4. How does the gravity problem relate to real-life situations?

The gravity problem serves as a simplified example of how gravity works in our everyday lives. In reality, gravity is a fundamental force that governs the motion of objects in the universe, from the movement of planets and stars to the falling of objects on Earth.

5. Can the gravity problem be explained by other theories?

Yes, the gravity problem can also be explained using Einstein's theory of general relativity. This theory provides a more comprehensive understanding of gravity, explaining how massive objects create a curvature in space-time that causes other objects to move in a curved path around them.

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