Loop de loop answer part 2 | Centripetal force and gravitation | Physics | Khan Academy

TL;DR

The average speed of a car in a circular loop de loop is calculated to be approximately 15.3 m/s or 55 km/h.

Transcript

In the last video, we figured out the absolute minimum speed in order to stay on the circular path right over here especially near the top was 27.6 km/h What I want to do in this video is I just clipped out the parts where he's actually on the loop de loop and I want to figure out his average [speed] So I'm going to use the video editor right here ... Read More

Key Insights

• 🔁 The circumference of the loop de loop is calculated using the radius formula.
• 🐎 The average speed is determined by dividing the distance traveled by the time taken.
• 🐎 The average speed is approximately twice the minimum speed required for circular motion.

Questions & Answers

Q: How is the time required to complete the loop de loop calculated?

The time is measured using a video editor, with the car's loop de loop taking approximately 2 and 14/30 seconds.

Q: What is the distance traveled in the loop de loop?

Assuming the loop is perfectly circular, the distance traveled is 12 pi meters, based on the circumference formula (2 pi times the radius).

Q: What is the average speed of the car in the loop de loop?

The average speed is calculated by dividing the total distance (12 pi meters) by the time taken to travel that distance (2 and 14/30 seconds), resulting in approximately 15.3 m/s.

Q: Why is it important for the car's speed to be higher than the minimum required?

Having a higher speed than the minimum ensures a margin of safety and allows for better traction with the road during the loop de loop.

Summary & Key Takeaways

• The time required for the car to complete the loop de loop is roughly 2.5 seconds.

• The distance traveled is calculated to be 12 pi meters.

• The average speed is determined to be approximately 15.3 m/s or 55 km/h.