Explain me this concept (Laws of Motion)

In summary, two blocks with a coefficient of friction \mu placed on a horizontal smooth surface have a horizontal force F applied to the lower block. To find the equations, Newton's second law (F = ma) must be applied twice, once for each block.
  • #1
snshusat161
214
1
Two blocks placed one on top of the other are lying on a horizontal smooth surface. The coefficient of friction between the blocks is [tex]\mu[/tex].

Case 1: Horizontal force F is applied to the lower block (Fig. 14).

[PLAIN]http://www.monbattle.com/1.jpg[/CENTER] [Broken]

Please help me to find out how they have got those equations. I'm trying to find it from past several hours but couldn't got any hint.​
 
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  • #2
Hi snshusat161! :smile:

(your link isn't working … it's http://www.monbattle.com/1.jpg" [Broken] :wink:)

You need to do good ol' Newton's second law (F = ma) twice, once for each block.

What equations do you get? :smile:
 
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1. What are the three laws of motion?

The three laws of motion were first described by Sir Isaac Newton in his book "Principia" in 1687. They are:

  • First Law: An object at rest will stay at rest and an object in motion will stay in motion with a constant velocity unless acted upon by an external force.
  • Second Law: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This can be expressed as F=ma (force = mass x acceleration).
  • Third Law: For every action, there is an equal and opposite reaction. This means that for every force exerted by one object on another, there is an equal and opposite force exerted by the second object on the first.

2. How do the laws of motion apply to everyday life?

The laws of motion can be observed in many everyday situations. For example:

  • First Law: A car will continue to move forward at a constant speed unless the brakes are applied, due to the inertia of the car.
  • Second Law: Pushing a shopping cart requires more force to move a heavier cart than a lighter one.
  • Third Law: When you walk, your feet push against the ground, and the ground exerts an equal and opposite force back, propelling you forward.

3. Why are the laws of motion important?

The laws of motion are important because they explain the fundamental principles behind how objects move and interact with each other. They are the basis for many other theories and laws in physics, and are essential for understanding and predicting the behavior of objects in motion.

4. How are the laws of motion related to each other?

The laws of motion are interrelated and build upon each other. The first law explains the concept of inertia, which is necessary for understanding the second law. The second law is used to calculate the acceleration of an object, which is then used in the third law to determine the equal and opposite forces between two objects.

5. Can the laws of motion be broken?

No, the laws of motion are fundamental principles of physics and have been proven to accurately describe the behavior of objects in motion. While there may be certain situations where it may appear that the laws are being broken, it is usually due to external factors or incomplete understanding of the situation. The laws of motion are considered to be universal and apply to all objects in the universe.

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