PPT-distance-and-displacement.defined as the science of matter, motion, and energyppt

PHYSICS
defined as the
science of matter,
motion, and energy.

REFERENCE
POINT
IT IS SOMETHING THAT
SEEMS STEADY THAT IS
USED TO COMPARE THE
POSITION OF AN OBJECT.

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.

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

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

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

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

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!

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!

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
+
-

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
+
-

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?

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.

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.

PPT-distance-and-displacement.defined as the science of matter, motion, and energyppt

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