Gravitational Force and Fields
The lesson covers the concept of gravitational fields and the laws of gravitational force as proposed by Isaac Newton. It explains the relationship between masses and the distance between them in determining gravitational force.
- 18:29 “Alright, from this place now, we have that what the V square, which is equal to 2G M over R. Now, make V, the subject of the formula, we have the V is equal to the square root of 2G M over R, we give us this, now, let's...”
- 13:35 “I'll have it to watch. I'll have it to be MV square X over R. It's equal to the force, giving to us, which is G, M1, M2, over R2. Now, I can take care of this. One of these can take care of this. Then, I'll have it to be...”
- 05:35 “G R square, M comes to M, we have, G is equal to, small G R square over, over M. By so doing, we have these as, big G. Okay, from this place, we will explain this, we've done this, we'll explain this, we'll explain the g...”
Work, Energy and Power
This lesson covers the definitions of work, energy, and power. It includes calculations for work done, gravitational potential energy, and power in watts. The lesson also distinguishes between kinetic and potential energy and explains energy transformation and the law of conservation of energy.
- 16:03 “Now, in solving this, just like we state the formula, potential energy equals MgH, where M is the mass of the objects. G is associated to gravity and H represents the height to which the object is raised. Now, our M equa...”
- 14:26 “But when an object is at rest, that particular object possesses what we call potential energy. Now, potential energy. Potential energy, this is energy possessed by a body, by a virtual of its position at rest. If an obje...”
- 15:15 “multiplied by height, to which the body is raised. And that is the weight of the body is Mg, then multiplied by height H. So that the formula for calculating our potential energy is MgH. Example, A man lift a load of 15...”
Fundamental and Derived Quantities
This lesson covers the definitions of fundamental and derived quantities in physics. It explains how fundamental quantities serve as the base for deriving other quantities and the importance of measurement in physical science.
- 21:17 “This is the mass times the weight, the acceleration due to gravity. And the mass is always major in kilogram as said earlier why the g, which is the acceleration due to gravity, is having an equivalent unit with the norm...”
- 23:44 “its scalar quantity, but a weight as magnitude and the direction and hence its vector quantity. The third one is it is the amount of matter contained in a body as explained earlier, the amount of matter, which is the fun...”
- 22:06 “As established mathematically, the weight of an object is the poorer of mass and the acceleration due to gravity. That is, mass m, mass m times g, which is the acceleration due to gravity. And that is the formula on the...”
Work, Energy and Power
This lesson covers the definitions of work, energy, and power. It explains potential and kinetic energy as forms of mechanical energy. The lesson also includes calculations related to work done and the concept of power as the rate of doing work.
- 11:31 “Now, it is given by MGH, where M is the mass of the body. Now, G refers to acceleration, but this small G you see is acceleration due to gravitational force. And its value is about 9.8 m/s square, but it can be approxima...”
- 17:34 “The second question says, a boy of mass 10 kg runs up a staircase having a height of 3.00 meters. Find the work done against gravity. And we are giving an acceleration due to gravity, same as the first question, 10 meter...”
- 12:22 “That is, the force of the body over the mass of the body. Whereas, the distance covered by the object is usually measured in kilometers or meters. Let's take an example. The question says, find the potential energy of an...”
Projectile Motion
This lesson covers the definition of projectile and projectile motion. It explains the concepts of time of flight, maximum height, and range, along with the relevant equations and examples from sports and warfare.
- 09:42 “Now, we want to get the range. Now, we are going to make use of the equation R which is H equal to U T plus R GT squared. Now on the horizontal plane according to the definition of range, there is no gravity on the horiz...”
- 03:57 “Just like we said in the last session that when an object is projected vertically upward, it will get to a particular height that it will be able to move upward again. It will stop momentarily before coming down. And tha...”
- 08:03 “And vertically, U is U sin theta. So why is substitute for that? We have 0, 0 squared is 0 equal to U sin theta all squared minus 2G H. So bringing to G H to this place, we have 2G H plus 2G H equal to this U squared sin...”
Equilibrium of Forces
This lesson covers the concepts of static and dynamic equilibrium. It explains resultant and equilibrant forces, the moment of a force, and the conditions for equilibrium under non-parallel forces. The lesson also discusses the center of gravity and its effect on stability.
- 16:07 “The center of gravity here, looking at it, is 50. So if the full crew is here, that means that is 50. Ah, the question says that a load of 40 Newton is suspended at 20 centimeters. So let's assume this place is 20 centim...”
- 15:12 “Examples now. Let's look at this. A 100-metre uniform road, 100-metre uniform road, as a load of 40 Newton suspended at 20 centimeters from one end. If the full crew is at the center of gravity, calculate the force that...”
- 24:48 “unlike the example that we did. Thank you for watching. My name is Mr. Bakari. Till next time.”