Physics additonal

Physics Additional

Speed/velocity

• Distance time graphs show how much distance an object travels over a period of time.
• speed is measured by using: speed = distance/time
• speed is a scalar quantity, it is how fast an object covers a certain distance. Velocity is a vector quantity, it is speed but a direction.
• Acceleration is measured by using:
• change in velocity (m/s)/time taken(s).
• a negative acceleration means the object is slowing down.
• velocity time graphs shows how an objects velocity changes over time. The gradient gives the objects acceleration.
• a flat line means a constant speed.
• the area under a velocity time graph shows the distance travelled.