# HEADWINDS and TAILWINDS - PowerPoint PPT Presentation

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1. HEADWINDS and TAILWINDS • The direction of a headwind is into the frontof the plane. • So a headwind the will cause the plane to slow down.

2. A tailwind blows from behind the plane. It blows into the back, or tail, of the plane. • This would cause the plane to speed up.

3. A plane is flying at 100 m/s when it experiences a tailwind of 15 m/s. What is the resultant speed? • The plane’s resultant speed is 115 m/s.

4. A boy is riding his bike at 5 m/s when a gust of wind blows directly toward him at 2 m/s. • Is this a headwind or a tailwind? • What is his resultant speed?

5. Vectors and Scalars • A vector is a quantity that has both magnitude and direction. • Magnitude is a number or amount.

6. A car has a velocity of 25 m/s north. What is the magnitude of its velocity? • 25 m/s

7. Speed does not have direction. It has only magnitude. • So speed is not a vector.

8. A scalar is a quantity that has only magnitude. • Time does not have direction. It is a . • Acceleration does have direction. It is a .

9. Mass has magnitude but not direction. • It is a . • Weight has magnitude but not direction. • It is also a .