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.
- 13:19 “So, our potential energy will be 20 kg, which is the mass of the body multiplied by the height, which is about 8 m and the acceleration due to gravity, which is 10 Newton/kg. We obtained 1,600 joules, which is the unit o...”
- 14:07 “Now, when a body moves, there is an energy it possesses. That energy is referred to as kinetic energy and the level of kinetic energy a body possesses depends on two factors, which are its mass and the velocity or speed...”
- 15:51 “So, half times 10 times 15 square gives us 225 multiplied by the 2, which is the denominator of the half by 10. You have 5 multiplied by the 225. Then the energy possessed by this body is about 1,125 joules. So, the body...”
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.
- 11:04 “should you come across it in another textbook for further research. Pleasure. Pleasure is given as force per unit area. So the force of an object over the area, don't forget that the force is the same thing as weight. Th...”
- 11:53 “So energy or work done is force times distance and force is major in Newton, why distance is major in words in meter. So it's having an equivalent. Sometimes if you don't see it as new thing meter, it is usually within u...”
- 22:53 “So multiplying 50, which is the mass of the man, times the acceleration due to gravity, which is 9.8, we have 490. And I showed you that weight or the force of an object is usually measured in new things. So the unit is...”
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.
- 24:48 “unlike the example that we did. Thank you for watching. My name is Mr. Bakari. Till next time.”
- 05:54 “of a force. So the toning effect experienced in each case is known as moment of a force. Moment of a force about the point mathematically can be defined as the product of the force and the perpendicular distance from the...”
- 21:11 “times the distance between the force and A. The force is 30 times distance between 30 and A. Is 6. This time between 30 and A is 6. Most be equal to another force, that's force F. Times the distance between F and E or A....”