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Fundamental Physics


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Some basic concept of Physics, about motion, SI units, frame of reference,

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Fundamental Physics

  2. 2. Physical Quantities and Units • Physical quantities the feature of some thing which can be measured • Numerical value • Unit
  3. 3. Unit • Importance of unit 50 waist slim or fat • System International SI 1960 Basic units Derived unit Supplementary unit Basic Unit Derived Unit Quantity Unit Symbol Mass Kilogram Kg Length Metre m Time Second S Electric current Ampere A Temperature Kelvin K Amount of substance Mole mol Luminous intensity Candela cd Quantity Unit /symbol Velocity m/s Acceleration m/ss Force Kgm/ss (Newton)
  4. 4. Question to Audience Light year is the unit of ?????? Distance
  5. 5. Scalar and vector Quantities • Scalar quantities Numerical values and unit time, mass, temperature • Vector quantities Numerical value, unit and dimension Acceleration, velocity, force
  6. 6. Question to audience • Difference between • Speed and velocity • Mass and weight • Distance and displacement
  7. 7. Kinematics the features or properties of motion in an object Rest and Motion w.r.t frame of reference Motion Describe in term of quantities position, velocity, acceleration • Speed • Velocity • Acceleration
  8. 8. Two dimensional motion (Projectile motion ) Two dimensional motion Body moves / covers vertical and horizontal distance
  9. 9. Force and motion (dynamics) the branch which is concerned with the motion of bodies under the action of forces • Newton’s laws of motion 1) 1st law of motion (law of inertia) 2) 2nd law of motion (description of force) 3) 3rd law of motion
  10. 10. • How we can measure INERTIA
  11. 11. Momentum • Linear momentum • Law of conservation of momentum Initial momentum = final momentum • Elastic and inelastic collision
  12. 12. Work and Energy • Work applied force x distance covered Question to audience Can we use displacement rather distance in Work formulae
  13. 13. Energy • ability to do work • Different forms of Energies • Law of conservation of energy Converted from one form to another Energy Notes Potential energy Due to position Kinetic energy Due to motion Solar energy Energy from solar Chemical energy Due to chemical energy Nuclear
  14. 14. Simple Harmonic Motion to-and-fro motion • Pendulum Mass attached to a spring
  15. 15. Static Charges
  16. 16. Nuclear Reaction Fission Reaction A big atom splits into small atoms. • Nuclear reactor • Disease • Destruction purpose Fusion Reaction Small atoms combined to form a big atom • Difficult to control • A large amount of energy is required
  17. 17. Q & A