Physics of Newton's Laws of Motion, momentum & COM (5 hrs)
4.4 (15 ratings)
1,131 students enrolled

# Physics of Newton's Laws of Motion, momentum & COM (5 hrs)

50 lessons | 5 hours of lessons on Dynamics for AP physics, physics 1, high school physics and IIT JEE Physics
4.4 (14 ratings)
1,131 students enrolled
Created by Vishesh Nigam
Last updated 8/2020
English
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This course includes
• 5 hours on-demand video
• Access on mobile and TV
• Certificate of Completion
Training 5 or more people?

What you'll learn
• Newtons' first law of motion - bodies in motion and rest
• Newton's second law of motion: Net Force = Mass X Acceleration
• What is weight, gravitational force and normal reaction
• What exactly is tension in a chord?
• Newton's third law of motion: making sense of action and reaction
• Conceptual understanding of free body diagram, blocks & pulleys
• Static friction and dynamic friction
• Accelerating elevators and weight loss (Part 1)
• Accelerating elevators and weight loss (Part 2)
• Center of mass | learn how to find it
• Newton's 2nd law of motion and how it relates to center of mass
• Linear momentum and Force realtionship
• Collision and Impulse | how do you calculate
• Law of conservation of linear momentum
• What exactly is elastic, inelastic and completely inelastic collision
• Momentum & energy conservation: bullet in a pendulum
• Elastic collision - velocity change with varying mass
• Collision in two dimension
• The rocket equation
Requirements
• Each lesson starts with basic physics before it reaches an advanced level. You will understand faster if you have some foundation in physics
Description

How can you become really good at  Newton's Laws of Motion, center of mass, linear momentum and collisions?

With over 1000 enrollments and 4.6 star rating, these 50 lessons will help and guide you to become good at this topic

If Newton's third law is true then how does a horse pull a cart. The cart should pull the horse back with the same force.

Well, when the horse pulls the cart, it is true the the cart also pulls the horse with the same force. However, the dynamics are a little more complex. Well does not mean that the force that the horse exerts on the cart has got cancelled. The cart will continue to to experience the pull and so would the horse from the cart being pulled. In a way they are 2 separate forces, each acting on separate object.

This is the reason problems around Newton’s laws of motion are solved by using “free body diagrams”. So if you see the horse in “isolation”, the horse is pulled in the direction of the cart (say right ), the horse itself is also applying a “force” towards the left. As a result, the net force (force vector to the left and force vector to the right) produce a net force vector that makes the horse and the system move

Newton's laws of motion include three laws Newton's first law, Newton's second law, Newton's third law, that in conjunction are rock bed of classical mechanics. So you can see in the above example, how they help us understand the relationship between a mass or a body and the forces acting upon it and the motion in response to those forces.

The second part of this course introduces you to the following concepts- 1. Center of mass (com) for a system of particles , 2.The velocity and acceleration of the center of mass and 3. Linear momentum for a single particle and a system of particles We will learn how center of mass of a system of masses can represent the system as a point. We also discuss the principle of conservation of linear momentum. We will also use the concept of conservation of linear momentum to study collisions in one and two dimensions and understand how momentum of rockets and the exhaust gases changes with time

Some of the most interesting problems in Physics are found in Mechanics. Most of these problems are around inclined planes, falling objects, frictional forces (static friction and dynamic friction), mass acceleration, velocity etc. Section 2 of this course is a compilation of such interesting problems and how they can be solved using Newton's laws of motion. The course makes use of calculus in certain places

When I create content for the lessons, I think deeply around the areas where students struggle and feel confused. My lessons tackle these parts in depth. Also, I believe visual representation of various ideas makes a lot of impact. The lessons have visuals and animations that are thought through quite deeply

And most importantly, I make myself available personally to answer questions that a student who has enrolled may have

My students wrote this to me

Bobbie Smith:                           Amazing explanations, I really learned a lot. Thank you.

Satyam Jha:                               amazing!! i could not understand vectors in my class but here it is very easy to understand Thanks a lot!!

Csaba:                                        I learned new ideas of approaches. I'm looking to try them in my professional practice as a teacher.Thanks! :)

Fernando  P. Radaza:              It help me a lot to understand better about Physics of Work, Power & Energy.

Chamara Dilshan:                    it's good, explaining every small thing ,it's good to start physics beginners

Onofrio :                                   The lessons given by the teacher are very interesting! Excellent course!

Simaran:                                    Very deep understanding of the subject Shiva Very knowledgeable and sounds very nice and helpful

Gallina:                                       Excellent the lessons held by the teacher with exhaustive explanations and well illustrated. Well done course! Smith:                                         Great course.The presentation is very clear. Thank you.

Pawan Kumar:                         The way to teaching us is amazing with all diagrams

Samit                                          This course has a lot of good content and very well presented. Thank you

Dani:                                            It was concise and consequent. The exercises were good exposed and explained. Simply excellent. I promise,     that i will use some ideas in my every day practice in my classroom. I'm also teaching physics, but in Hingarian. I finished this course to improve my skills, first of all in interesting approaches, and foreign language skills as well. This course was exactly what I expected!

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Who this course is for:
• Students in High School, AP Physics, Physics 1, CBSE
• Students preparing for competitive exams - IIT JEE, NEET, Subject SAT and freshman engineering
• Physics enthusiasts and curious minds
• Students in home schooling program
• Physics teachers who wish to improve their physics teaching skills
Course content
Expand all 50 lectures 04:57:27
+ Newton's Laws of Motion and Forces
20 lectures 02:38:16

Newton's 3rd law of motion states that every action has an equal and opposite reaction. Well, if a horse pulls a carriage, the carriage should also pull it back with the same force. Then why does the carriage start moving? Get a keen understanding of this law that applies to all real life situations.

Preview 11:13

Newton's first law of motion is amazingly simple yet very powerful. It tells us that bodies at rest will continue to be in state of rest and those in motion will continue to be so, unless some external force acts on them. While the law is simple, a deeper study will be worthwhile.

Newtons' first law of motion - bodies in motion and rest
05:17

Newton's 2nd law of motion states that the net force acting on an object is equal to the product of its mass and the acceleration, that the net force produces in the body. This law is often not put to proper use. This lesson gives a sense of what this law means and how it is applied in solving numerical problems

Newton's second law of motion
09:03

Application of Newton's laws of motion require a clear understanding of various forces like weight, gravitational force and normal reaction. This lessons explains what these forces are, and how they act on a body under motion, or rest

Gravitational force and Normal reaction
07:38

Conceptual understanding of tension in a chord or string can be confusing. Using it in solving numerical problems around Newtons Laws of Motion needs good understanding of it. This lesson explains what is tension, and how to use it in solving problems

Tension in a chord - What is it?
13:01

Making accurate free body diagrams for a system of blocks connected by chord and pulleys is an important step towards writing the correct equations of motion. This lesson explains how to make Free body diagrams (FBD), write the relevant equations and make use of Newton's 2nd law of motion.

Preview 09:39

Static and dynamic friction often shows up in numerical problems that utilize Newton's laws of motion. Learn in this lesson what static and dynamic friction is, and how you can use this understanding to solve problems around inclined planes in particular.

Static and dynamic friction and Newton's laws of motion
08:38

Solving inclined plane problems can be quite tricky. This lesson helps you understand how Newton's laws of motion can be used to solve such problems.

Inclined plane problems and Newton's laws of motion
11:52

Accelerating up in an Elevator and weight loss/ gain can be very nicely explained by Newtons Laws of Motion. Watch this video to have a deep understanding of how various forces acting on a body inside a moving elevator play to increase or reduce the weight

Preview 09:32

Accelerating up in an Elevator and weight loss/ gain can be very nicely explained by Newtons Laws of Motion. Watch this video to have a deep understanding of how various forces acting on a body inside a moving elevator play to increase or reduce the weight

Accelerating elevator and weight loss (Part 2)
07:33

Finding Center of Mass can be quite easy if understood well.In this lesson, learn how to find the center of mass of system of masses. The center of mass of an object is that point in the mass or a system of masses that represents the entire mass or the system. The center of mass is the particle equivalent of a given object for application of Newton's laws of motion.

Center of Mass | Learn how to find it
10:13

Newton's 2nd law of motion is applicable to an individual particles. The law is also applicable to the center of mass of a system of particles. This lesson helps you understand how a the center of mass of a system behaves in a way that the net force on the system equates with product of sum of masses in the system and the acceleration.

Newton's 2nd law of motion and Center of Mass
05:06

Linear momentum and force are not often used in solving questions.However there is an interesting derivation that connects the two. The rate of change of momentum of a particle is equal to the the net force on the particle. This definition extends to a system of masses as well and in a system the net force on the system equates with the product of vector sum of velocity of all particles and the sum of the masses

Linear momentum and Force
06:04

Collision and impulse are two important concepts within the topic of linear momentum. Impulse is nothing but change in momentum of a body. It is the product of net force and the time of the force. This in turn equates with the the product of mass and change in velocity. Watch this video to understand this concept and how it can relate to every day life

Collision and Impulse | How do you calculate?
07:00

What exactly is the difference between elastic, inelastic and completely elastic collision? This is a questions students ask often when the study this lesson. Watch this video to understand the simple difference between the 3 kinds of collisions.

Law of Conservation of Linear Momentum
05:45

What exactly is the difference between elastic, inelastic and completely elastic collision? This is a questions students often ask when they study this lesson. Watch this video to understand the simple difference between the 3 kinds of collisions.

What exactly is Elastic, Inelastic and Completely Inelastic Collision
05:46

Momentum and energy conservation is used to find velocity of a bullet that hits a pendulum. This video explains how a completely inelastic collision can be used to find this. It also demonstrates an excellent use of the law of conservation of energy and momentum to solve real life problems

Momentum & Energy Conservation: Bullet in a Pendulum
04:13

Elastic collision changes the velocity of masses that interact. It is interesting to analyze how the velocity changes with varying mass. Elastic collision applies to those collisions where the linear momentum and kinetic energy is conserved.This lesson discusses what is elastic collision and how the velocities for different masses result when collision happens

Elastic Collision - Velocity change with varying Mass
07:25

Collision in two dimension follows the momentum conservation principle (provided no external force acts on the system and it is isolated). If the collision is elastic in nature then the kinetic energy is also preserved. Watch this video to develop a better understanding of the topic.

Collision in Two Dimension
05:43

The rocket equation is a unique case where the law of conservation of linear momentum needs to be used with some caution. Unlike most cases, here the mass of each of the body under consideration (rocket and fuel) changes every moment. Watch this video to learn how the velocity of a rocket is related to the rate of change of mass of the rocket

The Rocket Equation
07:35
+ Numerical Problems and Solutions (IIT JEE, Subject SAT, AP Physics, NEET & CBSE)
30 lectures 02:19:11

The problem has a boat being pulled by 3 different forces. If Net Force =0, Find vector F3. We need to find what is the value of the unknown force vector F3 and one unknown angle of one of the forces. Such problems are solved by resolution of all forces in X and Y direction and then taking sum of all forces in X direction and sum of forces in Y direction. These are then equated to the product of mass and acceleration  (zero in this case). As such, it is nothing but utilization of Newtons 2nd law of motion that states that Fnet = ma

Calculating unknown vector, if net force is zero
06:19

Problems that have strings under tension can be easily solved by vector resolution of forces. Using Newton's 2nd law of motion, if you add up these forces and equate to zero, the unknown variables can be found

How to find tension in strings, using Newton's Laws of motion
06:58

When a car crashes into a wall, the seat belt provides the force that stops a car passenger from crashing forward. How do you find this force? The trick is to find the deceleration of the car. Learn, what exactly happens to the passenger as the car crashes. Learn, why deceleration of the car would determine the force that the seat belt needs to offer to restrain the passenger and Learn, why deceleration is not always negative

Force on a passenger in car crash
06:56

Static friction is the force that helps the small mass "m" to stay on top of mass M and prevents the fall. The limiting force of static friction is reached at a certain displacement of the system at X. The problem requires us to find this value X using Newton's laws of motion

Find displacement "X" for limiting force of static friction
06:53

When we apply Newton's laws of motion to a mass hanging from a spring in an accelerating elevator, we see weight gain or loss as the elevator ascents. How do we measure this? Find in this video in a few easy steps.

What is the weight gain of a mass on a spring in an elevator
10:56

The Problem requires us to find the force with which a mower needs to be pushed so that it moves at a constant speed. How do we find this. We find all forces acting on the mower and then equating the sum of the forces to the product of mass and acceleration using Newtons' 2nd law of motion.

Force on a mower for constant velocity
06:43

The Problem has 3 masses tied in series and hanging vertically down. The tension and acceleration in the strings is known. The key here is to draw free body diagram (FBD) for each mass and apply Newton's second law of motions

Preview 05:57

Forces on a sliding box on an inclined plane often requires identifying the right forces and plugging the sum of X and Y components of these forces into the equation F = ma. Learn the right method

Forces on a sliding box
04:14

The problem requires us to find the normal reaction on a box as it slides up due to force F. Newton's 2nd law of motion helps us to establish the relationship between net force and and the acceleration

Normal force on a box pulled up an inclined plane
05:28

The problem requires us to find the normal force on a box placed on the floor of an elevator. The trick is to first find the acceleration of the system and then use it to find the Normal Force.

What is the normal force on a box in an elevator?
04:24

The Problem requires us to find the force at which the box will accelerate in Y direction. To solve this problem a simple observation is required. The box will fly off when the Normal force is zero

Force required to accelerate a box in Y direction
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Solving double incline plane problems can be confusing. Solving double incline plane problems can be confusing if the basics of Newton's 2nd law of motion are not applied properly. Learn in this video how you can use the laws of motion to solve such problems.

Double incline plane problem
07:35

A parachutist bails out and the problem requires us to find the acceleration of the parachutist as he drops down

Parachutist and acceleration of the system
04:28

The problem utilizes Newton's 2nd law of motion to establish the acceleration of a rocket

What is the rockets acceleration?
02:15

Double inclined plane problems can be tricky. Not if you break down the problem by putting all the relevant forces in a free body diagram and then use Newton's second law of motion.

Preview 03:21

Finding Center of Mass can be quite easy if understood well.In this lesson, learn how to find the center of mass of system of masses. The center of mass of an object is that point in the mass or a system of masses that represents the entire mass or the system. The center of mass is the particle equivalent of a given object for application of Newton's laws of motion.

Given, Center of Mass, find (x,y) for 2 Kg Mass
02:08
Center of Mass of 3 Legged table
02:55
Velocity of a "Moving Center of Mass"
06:05
Impulse on a Diver due to Water
03:16
Impulse on a ball | Force on the Floor
02:13
Find velocity of rocket motor | Linear Momentum
02:40
Impulse on a striker for Variable Force
04:19
Momentum of Mass after Explosion
04:19
Blocks Connected with Spring | Momentum | KE
04:01
Momentum of a Bullet
05:22
Colliding Masses- Inelastic Collision
04:26
What is Velocity after Collision?
04:23
Inelastic Collision: Momentum + Mechanical Energy Calculation
03:08
Velocity of Ball | Momentum and Vectors
04:08
Rebounding Blocks on a Table
03:21