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Newton's Laws Of Motion JEE L1 | 𝟑 𝐋𝐚𝐰𝐬 & 𝐅𝐫𝐞𝐞 𝐁𝐨𝐝𝐲 𝐃𝐢𝐚𝐠𝐫𝐚𝐦 (Weight, Normal, Spring, Tension)

Vedantu JEE English・68 minutes read

Newton invented his laws during home quarantine due to the plague, including the law of gravity, which are fundamental for understanding motion and crucial for the industrial revolution. The physics teacher at Vedanta guides students on Newton's laws, balanced and unbalanced forces, inertia, internal and external forces, and the importance of free body diagrams in solving problems.

Insights

Newton invented his laws during home quarantine due to the plague, including the law of gravity, which is fundamental for understanding motion and was crucial for the industrial revolution.
Understanding balanced and unbalanced forces is essential, as balanced forces cancel each other out, maintaining equilibrium, while unbalanced forces lead to changes in speed or direction, impacting an object's state of motion.

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Recent questions

What are Newton's laws?
Newton invented laws of motion during quarantine.
How do internal and external forces differ?
Internal forces act within a system, while external forces come from outside.
What is the significance of equilibrium?
Equilibrium occurs when all forces cancel out.
How is tension defined in physics?
Tension is the force within a string or rod when pulled.
What is the formula for calculating weight?
Weight is mass multiplied by gravity.

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Summary

00:00

"Newton's Laws: Crucial for Understanding Motion"

Newton invented his laws during home quarantine due to the plague, including the law of gravity.
Newton's laws are fundamental for understanding motion and were crucial for the industrial revolution.
The physics teacher at Vedanta, an expert in preparing students for exams like IIT, BITS, and NITs, is guiding students.
The teacher emphasizes the importance of subscribing and liking videos for free access to classes.
The schedule for the week includes lectures on Newton's laws, pulley block problems, and tension problems.
The teacher congratulates 10th-grade students on their results and encourages them to prepare for exams like KVPY.
Newton's first law states that an object at rest or moving uniformly will continue unless acted upon by an unbalanced force.
Balanced forces cancel each other out, while unbalanced forces can change speed, direction, or both.
Students are encouraged to watch recorded lectures on vectors and kinematics in the playlist.
The teacher presents a question to test students' understanding of balanced and unbalanced forces, with multiple correct options.

16:15

Forces and Equilibrium: Maintaining Balance in Motion

Equilibrium is when all forces cancel out, keeping the body unchanged.
Balanced forces lead to equilibrium, like having equal weight on both sides of a seesaw.
Unbalanced forces disrupt equilibrium, causing a change in state.
Unbalanced forces result in changes in velocity for objects.
An object in equilibrium has a net force of zero, while one not in equilibrium does not.
An object in equilibrium will only stay that way if the net force is zero.
When a car turns, passengers feel pushed outwards due to inertia, not an external force.
Inertia is a body's tendency to maintain its motion and is proportional to mass.
Inertia resists changes in velocity or motion.
Internal forces act within a system, while external forces come from outside the system.

33:24

Internal and External Forces in Systems

When choosing a system consisting of Pandu, a scooter, and the Earth, the gravitational force will be internal.
Understanding whether a force is internal or external depends on the choice of the system.
Internal forces like heartbeats or lung movements do not cause movement; external forces are crucial for acceleration.
External forces in a system are essential for producing acceleration.
When analyzing a system, ensure all external forces are considered as they are responsible for acceleration.
In a system with Pandu, a trolley, and Champas, internal forces include the force between Pandu and the trolley.
External forces in the same system involve weight, normal force, and friction exerted by the ground.
Changing the system to only Pandu and the trolley results in all forces becoming external, with the force between Pandu and the trolley being internal.
When running, external forces like weight, ground forces, and friction are crucial, while internal forces include heartbeat and muscular forces.
Newton's second law states that the net force is proportional to the rate of change of momentum, not directly equal to mass times acceleration.

51:13

Calculating Forces and Acceleration in Physics

Net force is given by the formula F = ma, applicable when mass is constant and in SI or CGS units only.
The question involves finding force and acceleration using the momentum equation 5t^2 + 2t.
Force is calculated as 10t + 2, with the specific force at 2 seconds being 22 Newton.
Acceleration is determined by dividing force by mass, resulting in 2.2 meters per second squared.
The next question involves finding the third force when acceleration is 5 meters per second squared in the x-axis.
As there is no acceleration in the y-axis, the net force in the y-direction is zero.
Forces are split using trigonometry, with components calculated for each force.
The y-component of the third force is found to be 5 Newton, while the x-component is 6 Newton.
Therefore, the third force is determined to be 6i + 5j Newton.
Newton's third law states that for every action, there is an equal and opposite reaction, with forces not canceling if acting on different bodies.

01:09:08

Forces and Newton's Laws Simplified

Weight is the force acting vertically downwards, equivalent to mass multiplied by gravity (80 kg = 800 Newton).
Weight can be expressed in both Newton and kg, with both units being interchangeable.
Mass of an object can be calculated by dividing weight by gravity (65 Newton = 6.5 kg).
Tension is the force within a string or rod when pulled, caused by molecules stretching.
Tension acts in both directions on a string, depending on the chosen system.
A loose string will not have tension unless loaded, with exceeding tension causing breakage.
Normal force is the perpendicular force between two surfaces in contact, pushing against each other.
Normal force becomes zero when objects lose contact.
Spring force is proportional to the extension or compression of a spring, with force = spring constant x extension.
Free body diagram is crucial for solving Newton's laws problems, involving isolating the object, showing forces, choosing a reference frame, splitting forces into components, labeling forces, and showing acceleration.

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