Demo Lesson Plan FREE FALL

February 7-8, 2017 Tuesday-Wednesday Demo Lesson Plan in Grade 9- Science  Fourth Grading Grading Period

Egg drop physics! The teacher will give an egg with different  

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I. Learning Objectives At the end of the discussion, 80% of learners should be able to: a. describe the vertical motions of a projectile;  b. perform the following calculations calculations using formulas formulas c. II. Materials Maze, eggs, straws, papers, Powerpoint  presentations,  presentations, video presentations, presentations, and writing materials. materials. References: Grade 9 Science Curriculum Guidep. 56, Grade 9 Science Learners’ Module pp. 253-255, Conceptual Physics 12 th Edition by Hewitt pp. 46-49, Holt Physics by Serway and Faughn pp. 60-63, University Physics with Modern Physics 13 th edition by Young and Freedman pp. 52-54 III. Unlocking of Difficulties Acceleration- The rate at which velocity changes over time; the change in velocity may be in magnitude, or direction, or both. Uniformly Accelerating Motion- Acceleration of an object that has a motion of constant, uniform change in velocity over a period of time. Free Fall  –  IV. Lesson Proper

a. Daily Routines (Opening Prayer, Greetings, Attendance Checking)  b. Review Review of the Past Past Lesson Lesson  

What is acceleration? What is uniformly accelerating motion?

c. Motivation Maze! The teacher will form the students into groups.  

The teacher will giv

d. Activity

Five learners will go to the fourth floor and will drop the egg. The remaining learners will watch the egg as it drops down to the ground. Learners will examine the egg and will make observations afterwards.

d. Subject Matter Topic: Uniformly Accelerating Motion: Vertical Motion Concept: Free fall- when an object is falling due to gravity without the influence of free fall and air resistance. e. Discussion Analysis: 

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What do you think is the reason why the egg did not break? Why the egg does falls in the ground as you throw it? What can you say to the speed of the egg as it drops down to the ground?

Uniformly Accelerating Motion: Vertical Motion * Video presentation of a feather and bowling  ball under free fall will be projected projected on the wall. *In first scenario, the feather and the bowling  ball will be be subjected subjected into free free fall in a chamber chamber with air. air. *In the second scenario, the feather and the  bowling ball ball will be subjected subjected to free fall fall in vacuum vacuum chamber. Question: Free fall- when an object is falling due to gravity without the influence of friction and air resistance. An object that is having a free fall has an acceleration of 9.8 m/s2 due to gravity. This acceleration is uniform until it reaches the ground. Take note that the velocity of an object increases to 9.8m/s every second.

Figure 1. The increase of velocity in free fall is 9.8 m/s every second. Since there is a constant increase in velocity and friction is also negligible, we can say that the object accelerates uniformly.

Benson A. Roxas Student Teacher Checked by:

Ms. Rose Anne C. Sibug Cooperating Teacher V. Generalization

VI. Evaluation:

Solve the following problems: 1. A person pushing a stroller starts from rest, uniformly accelerating at a rate of 0.5 m/s 2. What is the velocity of the stroller after it has traveled 4.75 m? Answer: 2.18 m/s 2. A car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s2 and reaches a displacement of 19 m. What is the final velocity of the car? Answer: 12 m/s 3. A car enters the freeway with a speed of 6.5 m/s and accelerates uniformly for 0.95 m/s 2 for 20 seconds. How far the car moving after this time? Answer: 320 m VII. Homework Solve the following problems: 1. A race car accelerates uniformly from 18 m/s to 46 m/s in 2.5 seconds. Determine the acceleration of the car and the distance traveled. 2. A plane starting at rest at one end of a runway undergoes a uniform acceleration of 4.8 m/s 2 for 15 s  before takeoff. How long must the runway be for the  plane to be able to take off? 3. An automobile with an initial speed of 5 m/s accelerates uniformly at the rate of 2.5 m/s 2.Find the final speed and the displacement after 15 s.

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