Science requires careful observations

Why does this boat float?

# Ship floating on nothing! :: Physikshow Uni Bonn

School blocks YouTube? Use the file below

Sulfur hexafluoride is more dense
then the surrounding air

When physicists study motion they study
displacement not distance.

C. Displacement - distance & direction from start to finish

1) Examples

 Displacement?

1 m up

 Displacement?

3 m Right

(Start to finish)

 Distance = 7 meters   Displacement = 5 m N of E

2) Displacement always has ...

Magnitude

(a number)

..and direction

a) Examples

• 5m East
• 7m upward
• + 17 m

b) Positive and Negative Signs also show direction

+ Usually up, right, north, east, forward

- Usually down, left, south, west, backwards

c) Symbol for displacement: d

Summary Review

 At what point is the displacement: 1) greatest? 2) zero? 3) equal to distance?

[ Flash ]

4) What is the displacement at C?

 1) B   2) At the start 3) Any point between start and A

 Displacement at C is 4 meters down

 Velocity AP