PHYSICS - Forces - How Fast

The video explores the concept of speed, starting with the basics of calculating speed using distance and time. It discusses the speed of sound, including supersonic speeds, and compares it to the much faster speed of light. The video also examines everyday speeds such as walking, running, cycling, and wind, providing context with kilometers per hour. It highlights how different speeds affect our perception and the environment, such as the impact of wind and tornadoes.

What is the approximate speed of sound in air at 0 degrees Celsius?

• 300 meters per second

• 330 meters per second

• 350 meters per second

• 370 meters per second

Why do we see lightning before we hear thunder?

• Lightning occurs before thunder

• Light travels faster than sound

• Thunder is quieter than lightning

• Sound travels faster than light

How can you estimate the distance of lightning using the time difference between seeing and hearing it?

• Count the seconds and multiply by 3 for kilometers

• Count the seconds and divide by 2

• Count the seconds and divide by 3 for kilometers

• Count the seconds and multiply by 2

What is the speed range of a gentle breeze?

• 5.5 to 7.5 meters per second

• 3.5 to 5.5 meters per second

• 1.5 to 3.5 meters per second

• 7.5 to 9.5 meters per second

What was the highest wind speed ever recorded in a tornado?

• 115 meters per second

• 145 meters per second

• 125 meters per second

• 135 meters per second