FOCUS QUESTIONS: Q13. What is the position of the ball at 7.5 seconds?
ANSWER: _________________________________
Q14. At what time is the position of the ball equal to 12.5
meters? ANSWER: _________________________________
WHERE? How Far?
Describing exact position entails two ideas: describing how There are actually two ways to
far the object is from the point of reference and describing answer this question:
its direction relative to that point of reference. 1. by getting the total length of the
A. Describing through visuals path travelled by the object; and
2. by measuring the distance
between the initial position and
final position of the object
KEY POINTS:
1. Distance refers to the length of the entire path that
the object travelled.
Q6. What is the position of the dog? _______________
Q7. What is the position of the tree? ______________ 2. Displacement refers to the shortest distance between
Q8. What is the position of the dog with respect to the object’s two positions, like the distance between
the house? ______________________________ its point of origin and its point of destination, no
Q9. What is the position of the tree with respect to matter what path it took to get to that destination.
the dog? ____________________________________
PORTFOLIO:
Activity 2
My home to school roadmap
Objective
In this activity you should be able to make a roadmap
that shows how you get to school from your house.
Q10. What is the initial position of the ball? _________________ Procedure
What is its final position? ________________________________ 1. Devise a way to easily measure distance. Let your
Q11. What is the position of the ball at 10 seconds? _________ teacher check your non-standard measurement for
Q12. At what time is the position of the ball equal precision.
to 5 meters? ________________________ 2. Using your measuring device, gather the data that
you will need for your roadmap. Make sure that you
B. Using graphs
take down notes of all names of the roads, landmarks,
Another way to describe the motion of the ball is by the corners, posts, and establishments you pass by.
use of motion graphs. Convert the diagram in Figure 2 to Record your data properly.
graph by following the guide below. 3. Using your gathered data, draw your house-school
I. Fill up Table 1 using the data in Figure 2. Note that the roadmap on a short bond paper. Decide on the most
positions of the ball are shown every 5 seconds. convenient scale to use when you draw your
roadmap. An example is shown below.
Table 1: Position of the ball vs time
TIME (s) POSITION OF THE
BALL(m)
0 0
4. Label your roadmap properly, including names of the
roads, establishments, etc. Specify also the length of road.
5. Finally, let your teacher check again your work.
II. Plot the values in Table 1 as points on the graph in
Q1. What is the total length of your travel from your house
Figure 3. N
to your school? ANSWER: ____________________________________
Q2. What is the total displacement of your travel?
ANSWER: ____________________________________
How fast?
This information can be provided by the object’s speed or
velocity.
Speed is defined as distance travelled divided by the
time of travel.
The units of speed can be miles per hour (mi/h),
kilometres per hour (km/h), or meters per second
(m/s).
Grade 7- ________________
Name:___________________________________
Activity 4
Activity 3 Doing detective work
DEVELOPMENTAL QUESTIONS:
Fun walk Q1. How will you compare the distances between successive
Objective
dots?
In this activity you should be able to gather data to
____________________________________________________________________
determine who walks fastest. d do the lengths of the tapes compare?
Q2. How
PROCEDURE:
____________________________________________________________________
1. Start by choosing a spacious place to walk straight.
Q3. If each tape represents the distance travelled by the
2. Half of the group will walk while the other half will
object for 1 second, then what ‘quantity’ does each piece of
observe and record data
tape provide?
3. Mark on the ground the starting line. All participants Q4. What does the chart tell you about the speed of the
____________________________________________________________________
must start from the starting line at the same time. car?
____________________________________________________________________
4. Upon receiving the go signal, all participants must start
to walk as fast as they could. The other members should The difference in length between two successive tapes
observe closely as the participants walk and determine provides the object’s acceleration or its change in speed or
velocity for a time interval of 1 second.
who walks fastest.
5. Repeat #4 but this time, collect data to support your Q5. How will you compare the changes in the lengths of
two successive tapes?
conclusion. Discuss within your group how you are going
____________________________________________________________________
to do this. Q6. What then can you say about the acceleration of the
TIME HOW moving car?
NAME OF PARTICIPANTS RANK ____________________________________________________________________
(s) FAST?
1.
B. Using motion graphs
2.
3. 5. Measure the distance travelled by the car after 1 second,
4. 2 seconds, and so on by measuring the distance between
5. drops 0 and 1, 0 and 2, and so on. Enter your
6. measurements in Table 3 on the right.
7.
8. Time of Distance
9. Travel (s) travelled (m)
10. 1
2
Q1. What quantities did you measure for your data? 3
____________________________________________________________________ 4
Q2. How did you combine these quantities to determine 5
how fast each participant was walking?
6. Plot the values in Table 3 as points on the graph in
____________________________________________________________________
Figure 12 on the right.
____________________________________________________________________ Q7. How does your distance-time graph look like?
Q3. How did you use the result to determine who walked ____________________________________________________________________
fastest?___________________________________________________________ Q8. How does you graph look like? How is this different
Q4. At constant distance, how is speed related to the time from your graph in Figure 12?
of travel? ____________________________________________________________________
Q9. How will you interpret this graph in terms of the speed
____________________________________________________________________
and acceleration of the moving car?
Q5. At constant time to travel, how is speed related to the
____________________________________________________________________
distance travelled? Q10. If you found out in your investigation that the
____________________________________________________________________ arrangement of oil drops left by the car is similar to what
Q6. Who was travelling faster than the other, a person who you used in this activity, was the suspect telling the truth
covered 10 meters in 5 seconds or the one who took 10 when he said that he was driving with constant speed?
seconds to cover 20 meters? Prove your answer. ____________________________________________________________________
____________________________________________________________________
POINTS TO REMEMBER:
Speedometer is a device used to measure the instantaneous speed of a
vehicle.
Instantaneous speed is the motion rate of object at a particular time period
or moment.
Constant speed is that speed that does not change or stays constant
Velocity is the speed with direction.
Acceleration, by definition, is the change in velocity over a time interval
*Remember: Even if there is no change in speed but there is a change in
direction, acceleration is achieved
If an object does not change its position at a given time interval, then it is at
rest or its speed is zero or not accelerating.
If an object covers equal distance at equal intervals of time, then it is
moving at constant speed and still not accelerating.
If an object covers varying distances at equal intervals of time, then it is
moving with changing speed or velocity. It means that the object is
accelerating.
