1. mass and weight
1.1. mass
1.1.1. definition
1.1.1.1. the amount of matter contained in a body
1.1.2. SI unit
1.1.2.1. kilogram(kg)
1.1.3. multiples
1.1.3.1. 100 kg= 1 quintal
1.1.3.2. 1000 kg= 10 quintal= 1 tonne
1.1.4. sub-multiples
1.1.4.1. 1000mg= 1g
1.1.4.2. 1000g= 1kg
1.2. weight
1.2.1. defintion
1.2.1.1. the force with which the pulls a body to tits centre
1.2.2. newton
1.2.2.1. the amount of force acting on a body, when the earth pulls a mass of 100 g(98.1 g to be exact)
2. speed
2.1. definition
2.1.1. rate of change of motion
2.2. formula
2.2.1. distance covered / time taken to cover the distance
2.2.2. v= S/t
2.2.3. SI unit
2.2.3.1. m/s
2.3. kinds of speed
2.3.1. uniform
2.3.1.1. when a body covers EQUAL distances
2.3.1.2. in EQUAL intervals of time
2.3.2. non- uniform or variable
2.3.2.1. when a body covers UNEQUAL distances
2.3.2.2. in EQUAL intervals of time
2.4. average speed
2.4.1. when a body is moving with a variable speed
2.4.1.1. the average distance covered by this body
2.4.1.2. per unit time
2.4.2. formula
2.4.2.1. total distance covered / total time taken to cover the distance
2.4.2.2. v= S/t
3. velocity
3.1. definition
3.1.1. the rate of change of motion
3.1.2. in a specified direction
3.2. unit
3.2.1. m/s
3.3. kinds of velocty
3.3.1. uniform velocity
3.3.1.1. definition
3.3.1.1.1. when a body covers EQUAL distances
3.3.1.1.2. in EQUAL intervals of time
3.3.1.1.3. in a SPECIFIED direction
3.3.1.2. conditions
3.3.1.2.1. it covers EQUAL distances
3.3.1.2.2. direction REMAINS the same
3.3.2. non- uniform
3.3.2.1. when a body covers unequal distances in equal intervals of time
3.3.3. average velocity
3.3.3.1. the average displacement of a body per unit time when the body is actually moving