1. speed
1.1. definition
1.1.1. rate of change of motion
1.2. formula
1.2.1. distance covered / time taken to cover the distance
1.2.2. v= S/t
1.2.3. SI unit
1.2.3.1. m/s
1.3. kinds of speed
1.3.1. uniform
1.3.1.1. when a body covers EQUAL distances
1.3.1.2. in EQUAL intervals of time
1.3.2. non- uniform or variable
1.3.2.1. when a body covers UNEQUAL distances
1.3.2.2. in EQUAL intervals of time
1.4. average speed
1.4.1. when a body is moving with a variable speed
1.4.1.1. the average distance covered by this body
1.4.1.2. per unit time
1.4.2. formula
1.4.2.1. total distance covered / total time taken to cover the distance
1.4.2.2. v= S/t
2. velocity
2.1. definition
2.1.1. the rate of change of motion
2.1.2. in a specified direction
2.2. unit
2.2.1. m/s
2.3. kinds of velocty
2.3.1. uniform velocity
2.3.1.1. definition
2.3.1.1.1. when a body covers EQUAL distances
2.3.1.1.2. in EQUAL intervals of time
2.3.1.1.3. in a SPECIFIED direction
2.3.1.2. conditions
2.3.1.2.1. it covers EQUAL distances
2.3.1.2.2. direction REMAINS the same
2.3.2. non- uniform
2.3.2.1. when a body covers unequal distances in equal intervals of time
2.3.3. average velocity
2.3.3.1. the average displacement of a body per unit time when the body is actually moving
3. mass and weight
3.1. mass
3.1.1. definition
3.1.1.1. the amount of matter contained in a body
3.1.2. SI unit
3.1.2.1. kilogram(kg)
3.1.3. multiples
3.1.3.1. 100 kg= 1 quintal
3.1.3.2. 1000 kg= 10 quintal= 1 tonne
3.1.4. sub-multiples
3.1.4.1. 1000mg= 1g
3.1.4.2. 1000g= 1kg
3.2. weight
3.2.1. defintion
3.2.1.1. the force with which the pulls a body to tits centre
3.2.2. newton
3.2.2.1. the amount of force acting on a body, when the earth pulls a mass of 100 g(98.1 g to be exact)