Understanding Velocity and Speed

This video tutorial explains the concepts of speed and velocity, highlighting the difference between them. It covers how to calculate average speed and velocity, and distinguishes between scalar and vector quantities. The video includes practice problems to reinforce understanding and clarifies the difference between average and instantaneous values.

What does speed tell you about an object?

• The direction it is moving

• How far it has traveled

• How fast it is moving

• Its acceleration

How is velocity different from speed?

• Velocity is a scalar, speed is a vector

• Velocity is measured in different units than speed

• Velocity is always greater than speed

• Velocity includes direction, speed does not

What is the formula for average speed?

• Speed divided by velocity

• Displacement divided by time

• Distance divided by time

• Time divided by distance

Which of the following is a vector quantity?

• Velocity

• Distance

• Time

• Speed

Can speed be negative?

• No, it is always positive

• Yes, always

• No, it can be zero but not negative

• Yes, but only in certain conditions

What is the total distance traveled by a car that goes 40 meters east and then 90 meters west?

• 50 meters

• 40 meters

• 130 meters

• 90 meters

What is the displacement of a car that travels 40 meters east and then 90 meters west?

• 130 meters west

• 50 meters west

• 130 meters east

• 50 meters east

How is average velocity calculated?

• Total distance divided by total time

• Total displacement divided by total time

• Total speed divided by total time

• Total time divided by total displacement

What is the average velocity if a car's displacement is -50 meters over 20 seconds?

• -6.5 meters per second

• 6.5 meters per second

• 2.5 meters per second

• -2.5 meters per second

What is the difference between instantaneous speed and average speed?

• They are the same

• Instantaneous speed is over a short time, average speed is over a long time

• Instantaneous speed is over a long time, average speed is over a short time

• Instantaneous speed is always greater than average speed