MOTION EOYR

Speed

The distance traveled per unit of time; a scalar quantity indicating how fast an object is moving.

Units of Speed

Common units include meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph).

Formula for Speed

$$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$$

Example of Speed Calculation

If a car travels 150 meters in 5 seconds, the speed is 30 m/s: $\frac{150 \text{m}}{5 \text{s}}$.

Time Graph

A graph that plots time on the x-axis and distance on the y-axis, used to find speed and distance.

Slope of a Time Graph

The slope indicates speed; a steeper slope indicates a higher speed.

Acceleration

The rate of change of velocity per unit of time; a vector quantity.

Formula for Acceleration

$\text{Acceleration} = \frac{\text{Change in Velocity}}{\text{Time}}$.

Units of Acceleration

The standard unit for acceleration is meters per second squared (m/s²).

Graph Shapes Indicators

A straight line indicates constant speed, a curved line indicates acceleration or deceleration, and a horizontal line indicates the object is stationary.