mportant Definitions:
- physics
- zero error and error correction
- base quantities and derived quantities
- mechanics
- electromagnetism
- nuclear physics
- atomic physics
- plasma physics
- base and derived units
- electronic balance
- physical balance
- least count
Important Short questions
- differentiate between mechanical stopwatch and digital stopwatch
- advantages/role of physics in daily life
- write in scientific notation. (any term)
Important Long questions
- screw gauge (uses and functions)
- meter rule
- rules for identifying significant figures
9th physics Unit 2
Important Definitions:
- uniform velocity
- rest and motion
- translatory motion
- linear motion
- random motion
- acceleration and speed
- distance and displacement
- negative acceleration
- gravitational acceleration
Important Short questions
- name the types of motion
- derive 1st equation of motion
- a car starts from rest its velocity becomes 20 ms-1 in 8 seconds. find the acceleration.
- Important Long questions
- 2nd equation of motion with the help of graph
- write 3rd equation
- prove that vf= vi+at
- 9th physics Unit 3
Important Definitions:
- momentum
- centripetal force
- circular motion
- inertia
- law of conservation of momentum
- Newton's 2nd law of motion
- rolling friction
- sliding friction
Important Short questions
- differentiate between mass and weight
- two methods to reduce friction
- what is meant by banking of roads?
- Write units of a) momentum b) force
Important Long questions
- the relation between force and momentum
- Newton's 1st law of motion
- Newton's 2nd law of motion
- difference between mass and weight
- Benefits and disadvantages of friction and methods to reduce friction
- how much centripetal force is needed to move a body of mass 0.5 kg in a circular path of radius 50 cm with a speed 3 ms-1
9th physics Unit 4
Important Definitions:
- center of gravity
- rigid body
- torque and couple
- the moment arm of force
- moment arm
- axis of rotation
- resolution of vectors
- 2nd condition for equilibrium
Important Short questions
- differentiate between like and unlike parallel forces
- describe the line of action of a force
- how vectors are aded by head to tail rule?
- state princiaple of moments
Important Long questions
- A Numerical will come from this chapter
- what is meant by resolution of force? Resolve a force into its components
- find the center of gravity of an irregular with the help of the experiment.
9th physics Unit 5
Important Definitions:
- Global positioning system. GPS
- field of force
- law of gravitation
- the force of gravity (gravitational force)
- artificial satellites
- geostationary satellites
Important Short questions
- uses of artificial satellites
- why the values of "g" varies with the altitude?
- what are the factors the orbital speed of satellites depends?
Important Long questions
- Determine the mass of earth using Newton's law of gravitation
9th physics Unit 6
Important Definitions:
- magma
- fossil fuel
- fossils
- wind energy
- kinetic energy
- potential energy
- solar cell
- unit of power
Important Short questions
- difference between the renewable and non-renewable sources of high energy ?
- Name the renewable and non-renewable sources of energy
- name the types of energy
- Einstein mass-energy equation
Important Long questions
- A numerical will come from this unit (A cyclist does, A machine does work, a stone of mass 500 g, calculate the power of the pump)
- Working and construction of a nuclear power station
9th physics Unit 7
Important Definitions:
- density and its unit
- Pascal's Law
- Hook's law
- atmospheric pressure- heat
- temperature
- pressure and its unit
Important Short questions
- differentiate between stress and strain
Important Long questions
- explain Young's modulus and also derive its mathematical form.
- Explain that the pressure of a liquid increases with depth.
9th physics Unit 8
Important Definitions:
- latent hear of fusion
- the internal energy of a body
- evaporation
- specific heat capacity
- specific heat
Important Short questions
- why upper and lower sides points are fixed on a thermometer?
- define the coefficient of linear thermal expansion
- state kinetic molecular model
Important Long questions
- discuss volumetric thermal expansion also with derive its equation
- explain latent heat of fusion and latent heat of vaporization and write its formulae
- explain thathow much heat is required to enhance the temperature of 0.5 kg of water from 100 c to 350 c?
- convert 500 Celcius into Fahrenheit
9th physics Unit 9
Important Definitions:
- radiation
- thermal conductivity
- conduction
- greenhouse effect
- convection currents
Important Short questionsat?
- write down two ways of heat transfer.
- Why are metals good conductor of he
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