Help to understand Newtons Law

In summary, the diagram shows a gymnast hanging from a bar with a weight of 50kg. The bar has an upward arrow indicating a force of 550N, while the gymnast's weight is shown as 500N. This could mean that the bar is exerting 550N of upward force against the gymnast, or that the bar weighs 50N and the gymnast is bouncing upwards. The net force on the gymnast is either 50N or 0N, depending on the interpretation.
  • #1
urbano
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0

Homework Statement


I am trying to understand a diagram I have of a gymnast hanging from a bar. She weighs 50kg and is not swinging, just hanging. In the diagram it has her weight as 500N (using 10/m/s/s for gravity * 50kg) but the bar she is hanging from has an upward arrow with 550 N next to it. I interpret this to mean that the bar is exerting 550N of upward force against the gymnast. However I thought for every action there is an opposite reaction. Wouldn't this mean the bar is only exerting 500N up from the gymnast given here downward force is 500N ?

The object of the diagram is for people to interpret the net force on the gymnast.

Homework Equations


550N - 500N = 50N

or 500N - 500N = 0N

The Attempt at a Solution

 
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  • #2
Two possibilities:

The arrow is indicating an upward force on the bar from its supports. That would imply the bar itself weighs 50N.

The gymnast, though not swinging, is bouncing vertically. At the instant shown, the bar is deflected downwards and the gymnast is accelerating upwards.
 

1. What are Newton's Laws of Motion?

Newton's Laws of Motion are a set of three physical laws that describe the relationship between an object's motion and the forces acting upon it. They were first described by Sir Isaac Newton in 1687 in his book "Philosophiæ Naturalis Principia Mathematica".

2. What is the first law of Newton's Laws?

The first law, also known as the Law of Inertia, states that an object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an external force.

3. What is the second law of Newton's Laws?

The second law, also known as the Law of Acceleration, states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. In simpler terms, the greater the force applied to an object, the greater its acceleration will be.

4. What is the third law of Newton's Laws?

The third law, also known as the Law of Action and Reaction, states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object will exert an equal and opposite force back.

5. How are Newton's Laws used in everyday life?

Newton's Laws are used in a variety of ways in our everyday lives, from the way objects move to the design of vehicles and machines. For example, the first law explains why a cup will remain on a table unless a force is applied to it and the third law is applied in the propulsion of rockets and airplanes.

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