# speed and velocity

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speed and velocity

## 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

2.2.1. 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)