Matter:
consists of some thing which has weight, occupies space, and which can affect our senses.
Molecule:
Matter is made of molecule. A molecule is the smallest particle of substance which can exist in a free state
Mass:
Quality of a matter contained in a body.
Weight:
Force which a body is attracted towards earth.
Density:
Mass per unit volume.
Speed:
It is the rate of motion and a scalar quantity, i.e possesses magnitude only.
Acceleration:
Is the rate of increase of velocity.
Force:
Is a push or pull which changes or tends to change destroys.
Work:
When the point of application of the force moves work is said to be done.
Erg:
Is the unit of work and is the amount of work done when a force of one dyne moves a body through 1 cm in the direction of the force. Erg is the CGS unit of work.
Power:
Rate of doing work is called power.
Energy:
Capacity to do work is called energy.
Potential energy:
Energy due to its position.
Kinetic energy:
Energy due to motion.
Equilibrium:
Is the force acting on a body produces no change in its state of rest or motion. The body is said in equilibrium.
Lever:
It is a straight bar which is a capable of a rotation around a fixed point called fulcrum.
Surface tension:
The force of tension on the account of intermolecular force on the surface of a liquid is called surface tension.
Calorie:
Is the amount of heat required to raise the temperature of 1kg of water 10 c.
Temperature:
Is the degree of hotness in a body.
Latent heat:
Is the heat which is spent in the changing the state of a body without raising its temperature.
Total heat:
Total heat ,( a term used in calculation; it represents the units of the heat when the weight of the steam is one pound .It is the sum of the heat units in the water ,above 320 fahr and the latent heat of the steam.
Sensible heat :
(h) It is the heat required to raise the temperature of 1kg of liquid from 00 c to the boiling
point.
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