Free body diagram(its simple but i don't know why i can't understand it)

In summary, the conversation discusses the maximum value of force that can be applied to the lower block in order for the top block to not slide on a frictionless plane. The maximum static friction of the top block is calculated to be 12 N with a coefficient of friction of 0.036. The concept of a free body diagram is also mentioned, along with the necessity to draw separate diagrams for each block. The role of friction in opposing relative motion between the blocks is emphasized, and the question of what force acts on the upper block without friction is posed. The conversation also addresses how the value of fmax was obtained.
  • #1
1/2"
99
0

Homework Statement


If a 4kg block is placed on top of a 5kg block which placed on a friction less plane and a force is applied on the lower 5kg block ,For what maximum value of force will the top block not slide ?
μ=0.036

Homework Equations


The Attempt at a Solution


The maximum static friction that the top block can experience is fmax=μ mg=12 N
But the force acts on the lower block so what will be the force on the upper block that the friction will counter?
It would be nice to get a free body diagram.
 
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  • #2
1/2" said:

Homework Statement


If a 4kg block is placed on top of a 5kg block which placed on a friction less plane and a force is applied on the lower 5kg block ,For what maximum value of force will the top block not slide ?
μ=0.036

Homework Equations





The Attempt at a Solution


The maximum static friction that the top block can experience is fmax=μ mg=12 N
But the force acts on the lower block so what will be the force on the upper block that the friction will counter?
It would be nice to get a free body diagram.

Would you agree that the 5 kg block will have to accelerate if a force is applied horizontally?
 
  • #3
The frictional acts between the blocks: it is a force of interaction that opposes the relative motion of both blocks. Try to draw the free body diagram separately for both blocks.

What force acts on the upper block? What would happen to it without friction?

By the way, how did you get fmax=μ mg=12 N with μ=0.036?

ehild
 

Related to Free body diagram(its simple but i don't know why i can't understand it)

What is a free body diagram?

A free body diagram is a visual representation of all the forces acting on a body or object in a given system. It helps to analyze and understand the motion and equilibrium of the object.

Why is a free body diagram important?

A free body diagram is important because it allows us to identify and understand all the forces acting on an object, which is crucial in solving problems related to motion and equilibrium.

How do you draw a free body diagram?

To draw a free body diagram, start by identifying the object you want to analyze. Then, draw a dot to represent the object and label it with the object's name. Next, draw all the forces acting on the object as arrows pointing away from the dot. Label each force with its name and direction. Lastly, make sure all forces are drawn to scale.

What are the key concepts to understand when using a free body diagram?

The key concepts to understand when using a free body diagram are:

  • Newton's laws of motion: understanding how forces affect motion.
  • Types of forces: knowing the different types of forces such as gravity, normal force, friction, etc.
  • Equilibrium: understanding how forces balance out to keep an object in equilibrium.
  • Vector addition: knowing how to add and subtract forces to determine the net force acting on an object.

How can free body diagrams be used in real-life situations?

Free body diagrams are used in various real-life situations such as engineering, architecture, and physics. For example, engineers use free body diagrams to analyze the forces acting on a bridge to ensure it can support the weight of cars and trucks. Architects use free body diagrams to understand the forces acting on a building to ensure its stability. In physics, free body diagrams are used to solve problems related to motion and equilibrium in various scenarios such as a block sliding down a ramp or a person pushing a crate across the floor.

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