IB Physics Mechanics: Speed and Velocity

This video tutorial covers the physics concepts of speed and velocity, explaining the differences between scalar and vector quantities. It includes real-life examples and calculations, such as Mark's speed to work and a sample question on swimming laps. The tutorial emphasizes the importance of understanding units and conversions, and concludes with a summary of key learning goals.

What is the main difference between distance and displacement?

• Both distance and displacement include direction.

• Neither distance nor displacement include direction.

• Displacement includes direction, distance does not.

• Distance includes direction, displacement does not.

Which of the following is a scalar quantity?

• Force

• Speed

• Displacement

• Velocity

If Mark needs to travel 4.8 km in 4 minutes, what is his required speed in km/h?

• 72 km/h

• 44.7 km/h

• 60 km/h

• 4000 km/h

How do you convert speed from km/h to m/s?

• Multiply by 1.6

• Divide by 3.6

• Multiply by 3.6

• Divide by 1.6

What is the SI unit for velocity?

• Kilometers per hour

• Meters per second

• Miles per hour

• Feet per second

Which statement is true about velocity?

• Velocity is a scalar quantity.

• Velocity is always positive.

• Velocity does not have a direction.

• Velocity can be negative.

If an object returns to its starting point, what is its average velocity?

• Zero

• Cannot be determined

• Equal to its average speed

• Equal to its displacement

What is the average speed of Janice if she swims 450 meters in 510 seconds?

• 0.75 m/s

• 1.0 m/s

• 0.88 m/s

• 1.2 m/s

Why is Janice's average velocity less than her average speed?

• She swims faster than required.

• She swims back and forth.

• She swims in a circular path.

• She swims in a straight line.

What is the displacement of Janice after swimming 9 laps in a 50-meter pool?

• 450 meters

• 0 meters

• 50 meters

• 100 meters