IG Phy – Speed, Velocity and Acceleration

Speed is defined as the distance travelled per unit time.

The formula for speed is v=ts​, where v is speed, s is distance, and t is time.

Average speed is calculated by dividing the total distance travelled by the total time taken.

If a car travels 500 meters in 20 seconds, its speed is 20 m/s.

Speed and velocity are always the same.

A cyclist with an average speed of 5.0 m/s for 2.0 minutes travels 600 meters.

Velocity can have a negative sign to indicate direction.

The formula for acceleration is a=Δv​ / Δt.

Acceleration is defined as the change in speed per unit time.

If a car\’s speed changes from 25 m/s to 15 m/s in 2 seconds, its acceleration is 10 m/s².

The area under a speed-time graph represents distance travelled.

For an object with constant speed, the speed-time graph is a straight line parallel to the time axis.

If the acceleration of an object is 0.5 m/s², its speed increases by 0.5 m/s every second.

A speed-time graph with a straight line of positive gradient indicates constant acceleration.

An object at rest has a speed-time graph as a vertical line.