## 1. displacement is vector and distance is scalar

## 2. acceleration is the rate of change of velocity per unit of time

## 3. Accelerations are vector quantities (in that they have magnitude and direction).

## 4. In straight line, distance and displacemnt are equal

## 5. if a body returns to initial point its displaacent is zero

## 6. What is displacement?

## 7. points related to distance & dispacement

### 7.1. Their SI unit is m.

## 8. types of motion

### 8.1. Rectilinear motion, uniforrm motion,non uniform and circular motion

8.1.1. Distance can only be positive but Displacement can be positive, negative or zero.

8.1.1.1. Distance is path dependent whereas displacement is path independent.

### 8.2. rectilinear motion

### 8.3. Rectilinear motion

8.3.1. Circular or Rotational motion

8.3.1.1. Periodic and non periodic motion

### 8.4. Circular Motion

### 8.5. Uniform and non uniform motion, circular motion

### 8.6. Linear motion

### 8.7. oscillatory motion

## 9. speed/velocity

### 9.1. Velocity is vector

9.1.1. speed and velocity S.Iunits are m/s

### 9.2. speed is scaler quantity

### 9.3. Their SI unit is m/s.

9.3.1. Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector

### 9.4. v = speed+ direction. It can be in negative value.

### 9.5. velocity has magnitude and direction

9.5.1. Speed is scaler and velocity is vector.

### 9.6. Velocity is change in speed with respect to time in a specific direction.

### 9.7. avg speed

9.7.1. avg velocity

### 9.8. Speed is measured through distance and velocity is measured through displacement.

### 9.9. average speed= total distance/total time

9.9.1. total displacement /total time = avg.velocity

### 9.10. average speed is always greater than average velocity

### 9.11. In straight line, average speed=average velocity

### 9.12. If an object returns back, then average velocity will be zero whereas average speed will be there

### 9.13. types-uniform and non uniform velocity

## 10. acceleration

### 10.1. The change in velocity

### 10.2. The rate of change in velocity w.r.t. time.

10.2.1. It is a vector quantity.

10.2.2. SI UNIT.:m/s^2

### 10.3. important points

10.3.1. starts from rest, initial velocity u= 0

10.3.2. an object comes to rest/car brakes applied, final velocity, v= 0

### 10.4. a= v-u/t

10.4.1. acceleration due to gravity is 'g' and the value of g can be 9.8m/s2 or 10m/s2

10.4.1.1. when body falls/drops u = 0

10.4.1.2. when body reaches to maximum height,v=0

10.4.2. SI unit of acceleration - m/s2

10.4.2.1. Aceleratioon = v-u/t

## 11. EQUATIONS OF MOTION -v = u + at; s = ut + (1/2) at² and v² = u² + 2as

### 11.1. first equation/v-t relation

### 11.2. second equation/s-t relation

### 11.3. third equation/v-s realtion

## 12. The three most common types of motion graphs are velocity vs. time graphs and displacement vs. time graphs.

### 12.1. position/distance/displacement/x- time graph

12.1.1. slope- speed/velocity