7/27/2019 LP1.pdf

1/4

SUBJECT: PHYSICS

YEAR LEVEL: FOURTH YEAR

PSSLC COMPETENCY: Describe motion in terms ofposition/displacement, speed/velocity, and acceleration (Definition ofMotion)

Specific Learning Objectives

Knowl

edge 1. Define motion

2. Differentiate distance from displacement

Skills 1. Measure the length of path travelled.

2. Give the direction of moving body.

Attitude 1. Appreciate the importance of motion in everyday life

ASSESSMENTA. The following bodies may or may not be moving with respect to a reference

point.A. Girl lying on a couchB. Ball on its trajectory

C. Running carabaoD. Stalled jeepney

Which of the above situation are moving relative to the:1. Ground2. Moon

B. A honeybee leaves the hive and travels 2 km before returning.3. Is the displacement for the trip the same as the distance travelled?4. What is the distance travelled by the honeybee?

5. What is its displacement?STRATEGIES SUPPORTINSTRUCTIONAL

MATERIALSRoutine Activities

Pre-ActivityReview: Vector Addition

Motivation:Ask 5 students to engage in statue dancing (1represented per group) while other students act as the

judge. The last person standing is the winner.

Ask one student of his basis in judging and how was heable to conclude that his classmate is out of the game?

This will be the springboard in introducing the topic forthe day. Emphasize the necessity of citing thereference point in saying that the object is moving or atrest.

Cassette recorder ,music, radio

Activity1. Select two students to walk side by side along thefour corners of the classroom.2. Tell other students to take note of how far the two

travelled until they stopped3. Measure the length of path travelled by the studentsmaking the teachers table as the point of reference.

Meter Stick

AnalysisA.1. What is your basis in saying that your classmateshave moved?2. Did your two classmates move if we make theadjacent room as our point of reference?

7/27/2019 LP1.pdf

2/4

3. If we make the teachers table as the point ofreference, did they move?4. Did they move relative to each other?5. What must you remember in describing motion?

B1. What is the distance travelled by the students?2. When you classmates have returned to their point oforigin, what is their displacement?Abstraction1. What is motion?2. Give the difference between distance anddisplacement.

Application

On his way to school, Mike traveled 300 m East and 100m North.

1. What is the total distance travelled by Mike?2. Determine the displacement made by Mike.

Answers to the Assessment:

A. The body is said to have moved if it has changed its position with respect to a

point of reference.

1. If the reference is the ground,

B. Ball on its trajectory

C. Running carabao

2. If the reference is the moon, then all bodies will move since the earth

revolves around its axis and everything on it moves relative to the moon

and other heavenly bodies.

A. Girl lying on a couch.

B. Ball on its trajectory

C. Running carabao

D. Stalled jeepney

3. No. Distance is total length of path travelled while displacement is the

shortest distance from the point of reference to the final position.

4. 2 km + 2 km = 4 km

5. 0 displacement

Answers to the Application

a. Total distance travelled by Mike = 400 m

b. Use Pythagorean Theorem:

100 m

300 m

D

D2 = (300m)2 + (100m)2

D = 100,000m2

D= 316.23 m , N of E

7/27/2019 LP1.pdf

3/4

Further Readings

Motion (physics)

In physics, motion is change of location or position of an object with respect totime. Change in motion is the result of an applied force. Motion is typicallydescribed in terms ofvelocity also seen as speed, acceleration, displacement, andtime.[1] An object's velocity cannot change unless it is acted upon by a force, asdescribed by Newton's first law also known as Inertia. An object's momentum isdirectly related to the object's mass and velocity, and the total momentum of allobjects in a closed system (one not affected by external forces) does not changewith time, as described by the law of conservation of momentum.

A body which does not move is said to be at rest, motionless, immobile, stationary,or to have constant (time-invariant) position.

Motion is always observed and measured relative to a frame of reference. As there

is no absolute reference frame, absolute motion cannot be determined; this isemphasised by the term relative motion.[2] A body which is motionless relative to agiven reference frame, moves relative to infinitely many other frames. Thus,everything in the universe is moving.[3]

More generally, the term motion signifies any spatial and/or temporal change in aphysical system.

Translational motion occurs if all points in a body have similar paths relative toanother body. Rotational motion occurs when any line on a body changes itsorientation relative to a line on another body. Motion relative to a moving body,such as motion on a moving train, is called relative motion. Indeed, all motions are

relative, but motions relative to the Earth or to any body fixed to the Earth are oftenassumed to be absolute, as the effects of the Earth's motion are usually negligible

Distance and Displacement

Distance and displacement are two quantities which may seem to mean the samething yet have distinctly different definitions and meanings.

Distance is a scalar quantity which refers to "how much ground an object has

covered" during its motion. Displacement is a vector quantity which refers to "how far out of place an

object is"; it is the object's overall change in position.

To test your understanding of this distinction, consider the motion depicted in thediagram below. A physics teacher walks 4 meters East, 2 meters South, 4 metersWest, and finally 2 meters North.

http://en.wikipedia.org/wiki/Physicshttp://en.wikipedia.org/wiki/Position_(vector)http://en.wikipedia.org/wiki/Forcehttp://en.wikipedia.org/wiki/Velocityhttp://en.wikipedia.org/wiki/Accelerationhttp://en.wikipedia.org/wiki/Displacement_(vector)http://en.wikipedia.org/wiki/Timehttp://en.wikipedia.org/wiki/Forcehttp://en.wikipedia.org/wiki/Newton's_laws_of_motionhttp://en.wikipedia.org/wiki/Inertiahttp://en.wikipedia.org/wiki/Momentumhttp://en.wikipedia.org/wiki/Masshttp://en.wikipedia.org/wiki/Velocityhttp://en.wikipedia.org/wiki/Closed_systemhttp://en.wikipedia.org/wiki/Momentum#Conservation_of_momentumhttp://en.wiktionary.org/wiki/stationaryhttp://en.wikipedia.org/wiki/Time-invarianthttp://en.wikipedia.org/wiki/Frame_of_referencehttp://en.wikipedia.org/wiki/Motion_(physics)#cite_note-1http://en.wikipedia.org/wiki/Motion_(physics)#cite_note-2http://www.physicsclassroom.com/Class/1DKin/U1L1b.cfmhttp://www.physicsclassroom.com/Class/1DKin/U1L1b.cfmhttp://en.wikipedia.org/wiki/Position_(vector)http://en.wikipedia.org/wiki/Forcehttp://en.wikipedia.org/wiki/Velocityhttp://en.wikipedia.org/wiki/Accelerationhttp://en.wikipedia.org/wiki/Displacement_(vector)http://en.wikipedia.org/wiki/Timehttp://en.wikipedia.org/wiki/Forcehttp://en.wikipedia.org/wiki/Newton's_laws_of_motionhttp://en.wikipedia.org/wiki/Inertiahttp://en.wikipedia.org/wiki/Momentumhttp://en.wikipedia.org/wiki/Masshttp://en.wikipedia.org/wiki/Velocityhttp://en.wikipedia.org/wiki/Closed_systemhttp://en.wikipedia.org/wiki/Momentum#Conservation_of_momentumhttp://en.wiktionary.org/wiki/stationaryhttp://en.wikipedia.org/wiki/Time-invarianthttp://en.wikipedia.org/wiki/Frame_of_referencehttp://en.wikipedia.org/wiki/Motion_(physics)#cite_note-1http://en.wikipedia.org/wiki/Motion_(physics)#cite_note-2http://www.physicsclassroom.com/Class/1DKin/U1L1b.cfmhttp://www.physicsclassroom.com/Class/1DKin/U1L1b.cfmhttp://en.wikipedia.org/wiki/Physics

7/27/2019 LP1.pdf

4/4

Even though the physics teacher has walked a total distance of 12 meters, her

displacement is 0 meters. During the course of her motion, she has "covered 12meters of ground" (distance = 12 m). Yet when she is finished walking, she is not"out of place" - i.e., there is no displacement for her motion (displacement = 0 m).Displacement, being a vector quantity, must give attention to direction. The 4meters east is canceled by the 4 meters west; and the 2 meters south is canceledby the 2 meters north. Vector quantities such as displacement are direction aware.Scalar quantities such as distance are ignorant of direction. In determining theoverall distance traveled by the physics teachers, the various directions of motioncan be ignored.

Now consider another example. The diagram below shows the position of a cross-country skier at various times. At each of the indicated times, the skier turns around

and reverses the direction of travel. In other words, the skier moves from A to B to Cto D.