PHYSICS - Forces - Average Speed

The video tutorial explains how to calculate speed by dividing distance by time, using examples of a runner and Usain Bolt to illustrate speed variability. It differentiates between average and instantaneous speed, using cars and speed cameras as examples. The tutorial provides examples of calculating average speed, including a dog running and a car in traffic, and explains how to use distance-time graphs for these calculations.

What is the formula to calculate speed?

• Distance divided by time

• Distance multiplied by time

• Time divided by distance

• Speed multiplied by time

Why is speed not constant during a race?

• Runners always maintain the same speed

• Runners start slow and finish slow

• Runners may speed up or slow down at different times

• Runners only speed up at the start

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

• 3 meters per second

• 4 meters per second

• 1 meter per second

• 2 meters per second

What is the average speed of a car that travels 600 meters in 40 seconds?

• 20 meters per second

• 25 meters per second

• 10 meters per second

• 15 meters per second

How can average speed be determined from a distance-time graph?

• By dividing total distance by total time

• By finding the slope of the graph

• By adding all the distances

• By subtracting the initial time from the final time