# Grade 7 Physics: Motion Chapter

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## 3. rest

### 3.1. when the position of a body

3.1.1. with respect to its surroundings

3.1.2. does not change with time

## 4. motion

### 4.1. types of motion

4.1.1. translatory motion

4.1.1.1. example

4.1.1.1.1. a car moving on a road

4.1.1.2. types of translatory motion

4.1.1.2.1. rectilinear motion

4.1.1.2.2. curvilinear motion

4.1.2. circulatory motion

4.1.2.1. definition

4.1.2.1.1. the body moves about a fixed axis

4.1.2.1.2. without changing its postion

4.1.2.2. example

4.1.2.2.1. a spinning top

4.1.3. oscillatory motion

4.1.3.1. definition

4.1.3.1.1. to and fro movement of an object as a whole

4.1.3.1.2. without any change in the shape of the object

4.1.3.2. examples

4.1.3.2.1. the bob of the pendulum moving to and fro

4.1.4. vibratory motion

4.1.4.1. definition

4.1.4.1.1. it is a kind of oscillatory motion

4.1.4.1.2. and there is a change in shape or size

4.1.4.2. example

4.1.4.2.1. a guitar string being plucked

4.1.5. periodic motion

4.1.5.1. definition

4.1.5.1.1. it is a repetitive motion

4.1.5.1.2. which repeats itself after a fixed interval of time

4.1.5.2. example

4.1.5.2.1. the motion of a swing

4.1.6. non-periodic motion

4.1.6.1. definition

4.1.6.1.1. a repetitive motion

4.1.6.1.2. which repeats itself, but not at fixed intervals of times

4.1.6.2. example

4.1.6.2.1. a football player running around the field

4.1.7. uniform motion

4.1.7.1. definition

4.1.7.1.1. when a body coves equal distances in equal intervals of time

4.1.7.1.2. in a straight line

4.1.7.2. example

4.1.7.2.1. an airplane flying at a constant speed

4.1.8. random motion

4.1.8.1. definition

4.1.8.1.1. when an object changes its motion from kind to another

4.1.8.2. example

4.1.8.2.1. An empty ballon flying in the air

4.1.9. non- uniform motion

4.1.9.1. definition

4.1.9.1.1. when a body covers unequal distances in equal intervals of time

4.1.9.1.2. in a straight line

4.1.9.2. example

4.1.9.2.1. a car driving in the city