Understanding Speed: Average vs Instantaneous

The video tutorial explains how to calculate speed by dividing distance by time, highlighting the difference between average and instantaneous speed. It discusses non-uniform motion, using Usain Bolt as an example, and provides practical examples of calculating average speed for a dog and a car. The tutorial also covers how to use distance-time graphs for speed calculations.

What is the basic formula to calculate speed?

• Speed = Time / Distance

• Speed = Distance / Time

• Speed = Time - Distance

• Speed = Distance x Time

Why is it incorrect to assume constant speed in a race?

• Runners always maintain the same speed.

• Distance is always constant.

• Runners can change speed during a race.

• Speed cameras only measure average speed.

What is the difference between average speed and instantaneous speed?

• Average speed considers the entire journey, while instantaneous speed is at a specific point.

• Instantaneous speed is always higher than average speed.

• Instantaneous speed is the total distance divided by total time.

• Average speed is measured at a specific moment.

How do you calculate the average speed of a dog running 100 meters in 50 seconds?

• 2 meters per second

• 1 meter per second

• 0.5 meters per second

• 3 meters per second

If a dog runs 50 meters in 20 seconds and another 50 meters in 30 seconds, what is the total time taken?

• 20 seconds

• 30 seconds

• 50 seconds

• 40 seconds

A car travels 450 meters in 20 seconds and then 150 meters in another 20 seconds. What is the average speed?

• 15 meters per second

• 10 meters per second

• 20 meters per second

• 25 meters per second

What happens to a car's average speed if it slows down due to traffic?

• It decreases.

• It remains the same.

• It increases.

• It becomes zero.

How can a distance-time graph help in calculating average speed?

• By displaying the instantaneous speed.

• By showing the total distance and time.

• By providing the speed limit.

• By indicating the maximum speed.

What is the average speed if a graph shows 400 meters traveled in 70 seconds?

• 7.0 meters per second

• 6.0 meters per second

• 4.5 meters per second

• 5.7 meters per second

What is the key takeaway for calculating average speed in non-uniform motion?

• Average speed is irrelevant in non-uniform motion.

• Average speed is always constant.

• Average speed is the same as instantaneous speed.

• Average speed is found by dividing total distance by total time.