Simple machines (wedges)

1. WELCOME TO
SCIENCE
CLASS
With teacher Mariane

2. You are asked by your mother to split the
logs for firewood. What will you use to
split the logs?

3. Activity 1: How does a
wedge work?
Materials:
1. bread knife
2. bread
Procedure:
1. Cut or split the loaf of bread in half without using a
wedge.
2. Cut the loaf of bread with a bread knife.
3. Identify which part of the utensil is the wedge.

4. Simple
machine:
wedge

5. Objectives
At the end of the lesson, the students will be able to:
a. Describe the characteristics and functions of a wedge.
Enumerate examples and uses of a wedge.
b. Use wedge to solve everyday problems
c. Practice politeness during individual, paired and group activity

6. The picture below is box full of garden
tools. Point the wedges in the given
Picture

7. Guide Questions:
1. Describe a wedge.
2. Why is it that a wedge is considered a
modified inclined plane?
3. What is the function of a wedge?

8. A wedge is similar to an inclined plane because its parts with
the sharp edges can be likened to two inclined planes placed
back to back.
You can think of a wedge as two inclined planes that meet at a
point. Teeth, axe blades, knives, and door stops are all
wedges.

9. How does a wedge work?
1. A wedge separate or split objects in two

10. How does a wedge work?
2. Hold an object in place

11. How does a wedge work?
3. Lift an object

12. It changes the direction of your force. You can
apply an input force in one direction to its
base and it applies an output force in two
different directions from its two sides.
Wedges are especially helpful because a
pushing force turns into a splitting force. It’s
much easier to split an apple with a knife than
it would be to push or pull it apart with your
hands.

13. Which part of the tool or object is a wedge?
What is its purpose?
Chis
el
Zipper
Arrow
head
Knif
e
Nai
l
Need
le

14. Group activity
1. The class will be divided into two groups.
2. Each group will discuss and observe the object assigned to them (a ship
or a fighter plane).
3.. Answer the given question based on your observations.
4. You will have 10 minutes to complete your discussion and prepare your
answer.
5. After 10 minutes, two representative from your group will share your
answer with the class.
6. During presentation, everyone should practice politeness by listening
attentively and showing respect to each speaker.
INSTRUCTION
S :

15. RUBRIC

16. Group activity
Group 1: Describe the bow of the ship? Why do you think it is designed as
such?
Group 2: Describe the front of a fighter plane. Why do you think it is designed as such?

17. 1. What type of simple machine does the photo show?
A. lever. Wedge C.inclined plane, lever
B. pulley, wedge D. lever, screw
2. A nail can be hammered into a piece of wood, but a bolt cannot. What simple machine can be
found at the point of a nail?
A. a wheel and axle C. an inclined plane
B. lever D. a wedge
3. A screw is a(n) wrapped around a central cylinder.
A. lever B. inclined plane C. wedge D. wheel and axle
4. A simple machine used to raise a flag is a ________________.
A. gear B. wedge C. inclined plane D. pulley
QUI
z
Choose the letter of the best
answer

18. assignment
Find five more
examples of wedges at
home and explain how
they help make work
easier.

19. Thank
you