6. Hey, look again at the
pictures of the two friends.
What made Reymark push
the table at a certain
distance?
He made
it
because
he
exerted a
force on
it.
What do you
mean by
that?
When you
pushed
something
that means
you applied
a
FORCE…or
even when
you pull
something..
Clever!!!
Hmm…
even pulling
something?
7. ! You
are still
connecte
Congratulations! You are
really learning d…
a lot .
You did a lot of work
today.
Let’s
working on
it. Turn on
to the next
page.
8. Objective:
To identify if the given situation is a contact or non-contact force.
Directions:
Put a check ( ) whether the following
situations are contact force or non-contact force.
Situations Contact Force Non-contact
Force
1. Writing the
results of the
activity
2. Formation of
Rainbow
3. Playing
Basketball
4. Falling of
leaves
5. Painting the
9. Force - is a push or pull that produces motion,
prevents motion and changes the direction of the
motion of an object. It has both magnitude and
direction and therefore, a vector quantity.
Contact Force - a force between two
objects (or an object and a
surface) that are in contact
with each other.
NON-CONTACT FORCE - IS ANY FORCE
APPLIED TO AN OBJECT BY
ANOTHER BODY THAT IS NOT IN
DIRECT CONTACT WITH IT.
“Superb!!! The first reality
is unfolded…”
10. Great!
Now I
know
what
force is
and its
two
types.
….and this
is
somewhat
related to
work...
Really?
How come
they are
related
with each
other??
12. Objective:
To determine if there is a work done or no work done in
the pictures.
Directions:
Put a check () whether the following pictures show a
work done or no work done.
1.
2.
Work doneNo work done Work doneNo work done
13. 3.
5.
4.
Work doneNo work done
6.
Work done
No work done
Work done Work done
No work done No work done
14. 7.
8.
Work doneNo work done
9. 10.
Work doneNo work done
Work doneNo work done
Work doneNo work done
15. You really
learning a lot. You
did a lot of Work
today.
You’ve
just
about
mastered
it!
16. now, I understand
that its not only
force matters, if it is
applied at angle, to
lift upward the
object, having a
coefficient of friction
along a horizontal
surface but also the
distance the object
moved must be in
the same direction.
What? Say it now!
Hurry up!
Precisely! Your such
a gifted modern
James Prescott
Joule!
But, another reality
knocks my
mind…Eppsss… I
am going to treat
you your favorite
cheeseburger.
How can we
determine the
amount of work
done on the object?
17. That’s really a
nice question.
Maybe now,
you’ve really
understand the
scientific
definition of
work.
Of course!
And ready to
solve
problems..
But…one last
question
please!
What is that?
Hurry up!
What are
those
formulas
and steps to
follow?
Ah, see! We
have 4
formulas to
consider .
You mean,
we’ll torn on
to the next
page?
18. Formulas
of Work
F x D
Force x
distance
mgh
Mass x
accelerati
on due to
gravity x
height
μ FnD
Coefficien
t of friction
x Normal
F x
distance
Cos θ Fd
Cosine θ
x force x
distance
Expressed in Joules (J)
1N•m = 1J
1dyre•cm = 1 erg
In honor of James
Prescott Joule
19. Step 1 : Write the given,
required and formula to
be used.
Step 2: Substitute
the values.
Step 3: Compute for
the required.
Step 4: Box your
final answer.
Turn on to
the next
page .
20. Sample Problem:
Suppose you pull your
schoolbag with a force
of 30 N parallel to the
ground to your
classroom 20m away.
What is the work done
in your bag?
Let’s
compute!
Step1: Given
F= 30N d =
20m
Step2: Required
W =?
Step3: Formula W =
Fxd
=
(S3t0eNp4)(:2 F0imna)l answer: =
600Nm
Are you now ready to
solve problems?
21. Objective:
To compute for the work done in the given problems/situations.
Problem 1:
A man
pushes his car
with a force of
30N to the right.
He moves the
car at a distance
of 3 meters to the
right. What
amount of work
has he done?
Problem 2:
A
loaded cart as
shown in figure
, was push along
the handle of 30o
with the direction
of motion and
the cart moved
through a
distance of 6 m,
how much work
was done?
Given:
Required:
Solution:
Given:
Required:
Solution:
22. Problem 3:
A book
weighing 10N
moves at a
constant velocity
along a
horizontal
surface having a
coefficient of
friction of 0.30.
what is the work
done on the book
if it is moved at a
distance of
0.5m?
Given:
Required:
Solution:
Problem 4:
Suppos
e a librarian lift a
1.5kg book from
the lowest shelf
in the cabinet to
the fourth shelf
2m higher. What
is the work done
on the book?
(assume
g=9.8m/s²)
Given:
Required:
Solution:
23. Though you’re
hungry, we are
still on the right
track . . . Since
we certainly did
well today.
Cheeseburge
r !!! ???
Jollibee . . .
Jollibee …
have first a
game…
Hmm..
Ehem.. Later
for that, let
us sum up
first our
learnings
They are still on the
right track… since
they certainly did
well today…
24. I’ve learned that…
Work
Force
Distan
ce
Contac
t
Non-contact
F x D
Cos θ
x Fd
μFnD
Displace
ment
mgh
Product of the force
exerted on an object and
the distance the object
move
If a force is applied at an
angle
At constant velocity,
along a horizontal
surface with coefficient of
friction
Lifting an object w/c is
equal to the weight and
gravity
Is
done
only
whe
n a
force
is
appli
ed to
a
body
and
mov
es it.
25. Directions:
Choose the letter of the correct answer. Write
your answer on the space provided before each number.
____1. Which of the following forces is an example of a contact
force?
a. Gravitational force b. Magnetic force c. Electric forced.
Frictional force
____2. Which of the following are NOT examples of non-contact
force?
a. Gravitational force b. Magnetic force c. Electric forced.
____3.WFhricicht ioisn tahle feoxrcaemple of non-contact force in the
following situations?
a. Sun and planets gravitational pull b. sweeping the floor
b. A ball rolling d. playing softball
____4. Non-contact force can also be termed as
a. Action-Reaction Force c. Air-Resistance Force
b. Action-at-a-distance d. Frictional Force
____5. Contact force can also be termed as
a. Action-Reaction Force c. Air-Resistance
Force
b. Action-at-a-distance d. Frictional Force
26. Directions:
Choose the letter of the correct answer. Write your
answer on the space provided before each number.
_____1. In which instance there is no work done in the
system?
a. a basket being lifted
b. a person who stood in an ascending
elevator
c. a stone whirled around a horizontal circle
d. a big box dragged along the floor
_____2. Work can be defined as _______________.
a. a vector quantity
b. performed every time you exert force
c. the product of the applied force and the time the
force acts
d. done only when an object moves some distance due
to an applied force
_____3. In which of the following situations work is done?
a. lifting an object from the floor to the table top
b. supporting an object on your head while standing in
place
c. pushing a concrete wall
d. carrying a bag on your lap while seating
______4. From the pictures below, which situation/action show the
presence of work?
______5. With the pictures below, choose which of the
situation/action show the absence of work.
a. b. c.
d.
27.
28. Unlock the secret message in the golden scroll by using the code chart
below.
Let us all unfold the Reality
GOT IT
???
of Work.
“42 31 34 24
22 35
16 31 34 13 15
15 43 15 34 36 15 14
36 21 34 31 37 16 21
11
14 22 35 36 11 27 13
15.”
1 2 3 4 5 6 7
1 A B C D E F G
2 H I J K L M N
3 O P Q R S T U
4 V W X Y Z
29. How many words of three (3) letters or more can you
track down on this circles? The letters need not be connected by
lines. At least one word can be formed in the eleven letters that
reveals the secret to reach the finish line.
E
E
E
A
V
S
R
P
N
E
C R
How did you
score?
5-15: Good
16-25: Very
Good
26 or more:
Excellent!
Perseverance.
Keep on trying!
Work for it!
30. T T NEMECA L P S I D
MU J EME F A L K I I H
MT YODDOF X X S Y Z
EHHCU Z RYMT RRC
EHYGWL CWA VRCO
S B X X I T EN T NVUS
S BOB J EC T L NGO I
A XCP NEWTONO L N
MOV E NO I T C I R F E
Let’s do
this fun
activity,
just try to
hunt for
words you
think that
has any
relationship
with
work!!!
31. Arlene A. Aceron - Brazal et. al, 2002, Saint
Bernadette Publications, Inc., Physics for Filipinos,
p. 52, 85-88
Lolita M. Salmorin et. al, 2004, Abiva Publishing
House, Inc.,
Science and Technology Physics IV, p. 179-182
Delia Cordero-Navaza et. al, 1996, Phoenix
Publishing House, Inc.,
You and the Natural World Series Physics, p.
116-117
http://www.tutor4physicspositivenegativework.htm
http://www.princetonol.../Files...Praise.htm
http://images.google.com.ph/images
http://en.wikipedia.org
http://physics.info/work
32. 1. A 2. D 3. B 4. B 5. A
Present or
Absent?
See how smart you are!
1. A 2. D 3. C 4. C
5. D
It out!
1. C 2. A 3.A 4. B 5.
B
THIS IS REALLY IS IT!
33. Work
done
No work
done
1.
2.
3.
4.
5.
Work
done
6.
7.
8.
9.
10
.
No work
done
34. Given:
F = 30N to
the right
d = 3m, to
the right
Required:
W = ?
Solution:
W= F x d
= (30N) (3m)
= 90Nm or 90 J,
to the right
Given:
Cos 30° = 0.866
F = 70N
d = 6m
Required:
W = ?
Solution:
W = (F cos θ) d
= (70N x 0.866)
6m
=363.72 J
35. Given:
Fn = 10 N
d = 0.5 m
μ = 0.30
Required:
W=?
Solution: W = μ Fn
d
(0.30)(10
N)(0.5)
= 1.5J
Given:
m= 1.5 kg
g= 9.8
m/s²
h=2m
Required:
W=?
Solution: W= mgh
=1.5 kg)(9.8m/s²)(2m)
= 29.4 Nm
36.
37. Carp crave cave crap eve
creep
peace vane vase spare spear
case
Sea pea see acne near
arc
verse ear nap car peers
pen
race are rape care seen
can
neap rare rear ran cap
serve
Reserve nerve preserve
38. T T N E M E C A L P S I D
M U J E M E F A L K I I H
M T Y O D D O F X X S Y Z
E H H C U Z R Y M T R R C
E H Y G W L C W A V R C O
S B X X I T E N T N V U S
S B O B J E C T L N G O I
A X C P N E W T O N O L N
M O V E N O I T C I R F E
39. Most certainly, a Physics teacher or
any other person standing is doing
work, but the work being done isn’t
easily visible. Inside the body the
heart is pumping blood, the digestive
system is grinding away of
breakfast, receptors are drawing
molecules across cell membranes. We
do work even as we sleep. Forces
causing displacement are happening
everywhere under our skins.
40. “Being busy does not always
mean real
work. The object of all work is
production or accomplishment
and to
either of these ends there must
be
forethought, system, planning,
intelligence, and honest
purpose, as
well as perspiration. Seeming to
do is
not doing.”
