16. The length of the entire
path that the object
travelled is referred to
as DISTANCE. The
straight line from
starting to end point is
referred to as
DISPLACEMENT.
17.
18.
19. Distance
Distance (d) – how far an object travels.
Does not depend on direction.
Imagine an ant crawling along a ruler.
What distance did the ant travel?
d = 3 cm
cm
0 1 2 3 4 5 6 7 8 9 10
20. Distance
Distance does not depend on direction.
Here’s our intrepid ant explorer again.
Now what distance did the ant travel?
d = 3 cm
Does his direction change the answer?
cm
0 1 2 3 4 5 6 7 8 9 10
21. Distance
Distance does not depend on direction.
Let’s follow the ant again.
What distance did the ant walk this time?
d = 7 cm
cm
0 1 2 3 4 5 6 7 8 9 10
22. Displacement
Displacement (d) – difference between an object’s
final position and its starting position.
Does depend on direction.
Displacement = final position – initial position
d = dfinal – dinitial
In order to define displacement, we need directions.
Examples of directions:
+ and –
N, S, E, W
Angles
23. Displacement vs. Distance
Example of distance:
The ant walked 3 cm.
Example of displacement:
The ant walked 3 cm EAST.
An object’s distance traveled and its
displacement aren’t always the same!
24. cm
0 1 2 3 4 5 6 7 8 9 10
+
-
Displacement
Let’s revisit our ant, and this time we’ll find
his displacement.
Distance: 3 cm
Displacement: +3 cm
The positive gives the ant a direction!
25. Displacement
Find the ant’s displacement again.
Remember, displacement has direction!
Distance: 3 cm
Displacement: -3 cm
cm
0 1 2 3 4 5 6 7 8 9 10
+
-
26. Displacement
Find the distance and displacement of the
ant.
Distance: 7 cm
Displacement: +3 cm
cm
0 1 2 3 4 5 6 7 8 9 10
+
-
27.
28. Displacement vs. Distance
An athlete runs around a track that is 100 meters
long three times, then stops.
What is the athlete’s distance and displacement?
Distance = 300 m
Displacement = 0 m
Why?
29. EVALUATION:
1.Motion is when a body change its
position with respect to a reference
point.
2.Displacement is measured in scalar
quantity.
3.Distance is measured in vector quantity.
4.Scalar Quantity measures magnitude
only.
5.Vector quantity measures both
magnitude and direction.
30. Assignment:
Direction: Calculate the following:
1.Mina drives her scooter 7000 m North. She stops
for lunch and then drives 5000 m South. What
distance did she cover? What is her
displacement?
2.Tom walks 500m heading North and then 200m
back. Compute for his total distance and
displacement covered.
3.Jane travelled 6km, E and then 9km, W. Find
Jane’s distance travelled and displacement.