General Physics I

The route

Lessons are in the order that makes each one easier than the last. Each unit ends with a short quiz.

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   Unit 1

   Physical Quantities, Units and Dimensions

   Physical quantities, SI units and prefixes, dimensions and dimensional analysis, and honest numbers with errors.
   1. Physical Quantities and SI UnitsFree A number on its own is gossip. A number with a unit is physics. 10 min
   3. Dimensions and Dimensional Analysis Strip away the units and every quantity is just mass, length and time in disguise. 14 min
   4. Significant Figures and Errors in Measurement Every measurement carries a small doubt. Good physics writes the doubt down. 13 min
   5. Unit 1 quiz7 questions on this unit 9 min
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   Unit 2 Full plan

   Vectors

   Scalars and vectors, adding by triangle and parallelogram, resolving into components, unit vectors, and the dot and cross products.
   1. Scalars and Vectors Three plus four is not always seven. Welcome to quantities that point. 10 min
   2. Resolution of Vectors Any slanted push is secretly two straight pushes. Find them and the hard problems turn easy. 10 min
   3. Unit Vectors, Scalar and Vector Products Vectors in three letters, and the two products that turn them into work and turning. 14 min
   4. Unit 2 quiz6 questions on this unit 8 min
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   Unit 3 Full plan

   Kinematics

   Displacement, velocity and acceleration, motion graphs, the equations of motion, free fall and projectiles.
   1. Displacement, Velocity and Acceleration Distance, displacement, speed, velocity and acceleration, and why the ambulance driver cares about all five. 10 min
   2. Displacement–Time and Velocity–Time Graphs The slope tells you one thing, the area tells you another. Learn which is which and graphs answer themselves. 10 min
   3. Equations of Uniformly Accelerated Motion Know any three of u, v, a, s and t, and the fourth and fifth fall out. 10 min
   4. Projectile Motion A football in flight is really two simple motions happening at once, one sideways and one up and down. 10 min
   5. Unit 3 quiz6 questions on this unit 8 min
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   Unit 4 Full plan

   Newton's Laws of Motion and Momentum

   Newton's three laws, weight, friction, slopes and lifts, impulse, and the conservation of momentum in collisions.
   1. Newton's Laws of Motion Why passengers lurch forward when a danfo brakes, and the three sentences that explain every push and pull. 10 min
   2. Friction, Inclined Planes and Apparent Weight Draw the forces first and the hardest Newton problems become two lines of algebra. 10 min
   3. Momentum, Impulse and Collisions Why airbags save lives, why guns kick back, and the quantity that survives every crash. 14 min
   4. Unit 4 quiz6 questions on this unit 8 min
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   Unit 5 Full plan

   Work, Energy, Circular Motion and Gravitation

   Work, kinetic and potential energy, power and efficiency, circular motion, and Newton's law of gravitation with orbits and escape velocity.
   1. Work and Energy In physics you only do work when a force moves something. Holding a heavy bag still does not count. 10 min
   2. Conservation of Energy, Power and Efficiency Energy changes form but never disappears, and power is how fast that change happens. 10 min
   3. Circular Motion A keke rounding a bend is accelerating even at a steady speed. Here is why, and what pulls it inward. 10 min
   4. Gravitation The same force that drops a mango in Benue keeps the Moon in its orbit and the satellites above Nigeria in theirs. 14 min
   5. Unit 5 quiz7 questions on this unit 9 min
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   Unit 6 Full plan

   Properties of Matter and Heat

   Elasticity, pressure in fluids, Pascal and Archimedes, temperature and expansion, specific and latent heat, and how heat travels.
   1. Elasticity Why a rubber band springs back, chewing gum stays stretched, and engineers trust Young's modulus. 10 min
   2. Pressure in Fluids Why a needle pierces skin, a drip bag hangs high, and blood pressure is still quoted in millimetres of mercury. 10 min
   3. Pascal's Principle, Archimedes' Principle, Surface Tension and Viscosity A small push becomes a huge lift, a steel ship floats, and water climbs up thin tubes all by itself. 14 min
   4. Temperature, Thermometry and Thermal Expansion Three temperature scales, the clever kink in a clinical thermometer, and why railway lines need gaps. 14 min
   5. Specific Heat Capacity and Latent Heat Why a pot of water takes so long to boil, and why boiling it dry takes five times longer still. 10 min
   6. Heat Transfer Conduction, convection and radiation, the sea breeze in Lagos, and the flask that keeps tea hot all day. 13 min
   7. Unit 6 quiz8 questions on this unit 10 min

Practise and remember