Speed-Time Graphs | Physics for GCSE/IGCSE - Year 11 PDF Download

Speed-Time Graphs

A speed-time graph demonstrates how the speed of a moving object changes over time.

• The red line on a speed-time graph signifies an object undergoing acceleration.
• Conversely, the green line on the graph represents an object decelerating.

Acceleration on a Speed-Time Graph

• Constant acceleration or deceleration is indicated by speed-time graphs.
  • The value of acceleration or deceleration magnitude is depicted.
  • A constant acceleration is symbolized by a straight line.
• The degree of slope on the line indicates the magnitude of acceleration.
  • A steep slope signifies a significant acceleration (or deceleration), implying rapid speed changes.
  • A gentle slope suggests a minor acceleration (or deceleration), indicating gradual speed adjustments.
  • A flat line indicates zero acceleration, meaning the object maintains a constant speed.

Using Speed-Time Graphs

• The concept of finding the distance traveled by an object using the area beneath a speed-time graph is fundamental.

• When the area beneath the graph forms a triangle, indicating acceleration or deceleration, a specific formula can be applied to determine the area.
  
• In cases where the area beneath the graph forms a rectangle, representing constant velocity, a separate formula is utilized to calculate the area.