Effect of Speed and Direction on Velocity

Activity Analysis: Sachin's motorcycle ride shows how speed and direction affect velocity.

Effect on velocity

1. Speed Increases or Decreases with Constant Direction: If the speed of the motorcycle increases or decreases but the direction remains unchanged, the velocity changes because velocity depends on speed.
2. Turning on the Road (Speed and Velocity Comparison): While making a turn, even though the speed stays constant, the velocity shifts due to the change in the direction of motion. Speed remains constant, but velocity depends on both speed and direction.
3. Changing Direction with Constant Speed: If Sachin changes the direction of the motorcycle but keeps the speed constant, the velocity changes because the direction is a part of velocity.
4. Changing Both Speed and Direction: If Sachin changes both speed and direction, the velocity changes significantly because both factors contribute to it. Velocity depends on both speed and direction.

Velocity changes when:

• Speed changes (even if direction remains the same).
• Direction changes (even if speed remains constant).
• Both speed and direction change.

Interesting Facts about Speed:

1. Galileo was the first scientist to measure speed as distance/time.
2. Speed of sound in dry air: 343.2 m/s.
3. Speed of light: 3 × 10⁸ m/s.
4. Speed of Earth's revolution around the sun: 29,770 m/s.

This activity highlights the dynamic nature of velocity and its dependence on two key variables: speed and direction.