Forces acting on a two object system using free body diagram

These forces come in pairs and act in opposite directions, one on each object involved in the interaction. So, the following five forces act on box 2 and 3 together: gravity pulling on box 3, gravity pulling on box 2, box 1 pushing on box 3, floor pushing on box 2, and floor pushing on box 1. In summary, the free body diagram would show these five forces, with the gravity forces acting downward, the floor forces acting upward, and the box 1 pushing on box 3 force acting to the right.
  • #1
meaganl
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Homework Statement


threeboxes.gif

A force of magnitude F= 7.30 N pushes three boxes with masses m1= 1.80kg, m2= 3.00kg and m3= 4.20kg, on a level surface.
Draw a free body diagram showing all the individual forces acting on the system consisting of boxes 2 and 3 together. Indicate the directions of the five forces listed below, choosing from vectors A-D in the diagram. If a force does not belong on the FBD, enter N.
directions.gif

i) gravity pulling on box 3
ii) gravity pulling on box 2
iii) box 1 pushing on box 3
iv) floor pushing on box 2
v)floor pushing on box 1

Homework Equations





The Attempt at a Solution



I have tried many solutions like NNNAN, CCNAN,CCNBN and more but it keeps telling that I'm wrong.
 
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  • #2
You are asked to draw a FBD of the system of blocks 2 and 3 together. The gravity force is always an external force and always present acting down on an object if the object is on earth...it pulls it toward Earth's center. Besides the gravity force, objects are subject to contact forces at the surfaces that touch each other.
 

1. What is a free body diagram?

A free body diagram is a visual representation of all the forces acting on a two object system. It shows the direction and magnitude of each force using arrows and labels.

2. How do you determine the forces acting on a two object system?

To determine the forces acting on a two object system, draw a free body diagram and identify all external forces acting on the objects. These can include gravitational force, normal force, frictional force, and applied force.

3. How do you represent the forces on a free body diagram?

Each force on a free body diagram is represented by an arrow. The length and direction of the arrow indicate the magnitude and direction of the force, respectively. The arrow should be labeled with the name of the force it represents.

4. What is the purpose of using a free body diagram?

The purpose of a free body diagram is to help visualize and analyze the forces acting on a two object system. It allows for easier identification of all forces and their effects on the objects.

5. Are there any limitations to using a free body diagram?

While free body diagrams are a helpful tool, they have some limitations. They only consider forces acting on a two object system and do not take into account other factors such as motion, velocity, or acceleration.

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