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Science requires careful observations

 

Why does this boat float?

Ship floating on nothing! :: Physikshow Uni Bonn

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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

 

 

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