Lesson : Quarter 2 Week 6 LAS 1 Activity Title : Identify the different motion. Learning Target : Define vertical, horizontal and projectile motion. Reference(s) : SLM Physical Science LAS Writer : Clarissa Marie M. Laruan, T-Il CONCEPT NOTE inside a vacuum Free fall is a downward motion under the influence of gravitational force. From the first activity you did, you proved Galileos point of view of free fallen 1 bodies. If you release both objects in horizontal position with different masses in the same height you probably notice that both bodies will reach the ground in the same rate. However, if the two objects release in airless environment or in a vacuum both bodies regardless to their masses will fall at the same time. If you release both objects in horizontal position with different masses in the same height you probably notice that both bodies will reach the ground in the same rate. However, if the two objects release in airless environment or in a vacuum both bodies regardless to their masses will fall at the same time. IN AIR IN VACUUM Inside the vacuum (airless environment) both feather and apple hit the ground in the same rate regardless to their masses. In air, apple will fall first on the ground is this because of the air present in the environment that resist objects position directly downward. Therefore, in air the lighter object will fall slow down because of countless particles of air that collides with the objects called the air resistance. The more air resistance it take the object to fall decreases the downward speed of an object. In the absence of air resistance a falling objects will Increase its velocity by 9.80 m/s2 in every after a second and the value ayomis of this is called the acceleration due The initial velocity of the ball is zero to gravity. (a=g) this is always because the motion is at rest. The ball directed downwards. will fall because of gravitational force of the earth (9.80m/s). The ball will reach The initial velocity of the ball is the ground in 3m distance after 3 Om/s at rest. If you analyze the seconds time. figure above the ball accelerated 5 Hom/. m/s in every two seconds and that is called uniformly or constant 195m/s See the figure 3.0: The ball fall in a accelerated motion. Uniform or Throw/s constant acceleration in equal time constant accelerated motion is a period. type of motion in which the velocity of an object changes by an equal It zom/. amount in every equal time period. Note! Equations to solve problems in Free fall; simply let a=g Equations of Uniformly Accelerated Equations of Free Fall Motion V V, - at d= ( vetv; / 2) : d= ( vetvi / 2) t V2=vi2 +2ad Va =v2 +2gd d= v.(t) + (1/2) at2 d= v.(1) + (1/ 2) gt2 Sample problem A stick is thrown downward with an initial speed of 8 m/ s. After 2 seconds, the stick's's velocity is m/s Given: Equation: ve vi+ at Initial velocity: 8m/s Solution: v(f): -8m/s + (-9.8m/s) 2s Time: 2s - 27.6 m/s46. Which of the following situation explains inertia? A. Ball starts to move B. Accelerating Car C. A man run with a speed of 5km/h D. A bullet shot upward with a speed of 2,500 feet per second 47_ According to lsaac Newton the objects move because they have a force; unless alan made it stop. A. Velocity C. Temperature B. Unbalanced Force D. Stable force 43, Which of the following is TRUE about inertia? A. inertia is being affected by distance. B. in changing the motion of a certain object, inertia must be replaced by a velocity acting on it. C. inertia is a will tumble on the right side of the bus. 44. The students are playing a tug of war. Which of the following part of the game will best describe inertia? A. Both sides were holding the rope applying equal forces. 8. Side A applied 5 N force C. Side 8 applied 6 N force D. Side A won by applying force doubled from side B force. 45. A ball on the table has A. An acceleration of 2m/52. B. A velocity of 5 m/s C. An equal forces acting on it d D. Unequal forces acting on it 46. It is a motion that is being enforced because it is the result of a force or external force applying to an object. A. Natural motion. B. Projectile motion C. Violent motion D:Horizontal motion 47. it refers to the universal definition of a movement or change of place, direction or location in a given time. A. Force B. Motion C. impetus D. Trajectory 48. Randy throw a piece of stone horizontally to the pond. What will happen to the radius of its curved path when he released the stone with greater force? A. The lesser the force. the smaller the radius of its curved path. B. The greater the force, the greater the radius of its curved path. C. The greater the force, the smaller the radius of its curved path. D. The smaller the force, the greater the radius of its curved path. 49. Which of the following is not Aristotle's point of view of motion? A. Heavier object fails faster. B. To keep an object in motion, a force is required. C. An object will find its resting place as an example of natural motion. D. Both objects hit the ground regardless to its mass. 50. If a soccer player kicks the ball horizontally in less force, what happen to the path of a soccer ball? A. Shorter curved path B. Greater curved path. C. Projectile in motion D. Soccer ball travels vertically in motion. 51. If an objects falls down in horizontal position, then it falls A. Faster C. Acquire less air resistance B. Slower D. Increase the motion 52.A stone is initially rolled at 20m/s, what would be the distance if a stone hit the ground at 25m/s if its velocity after 5.0 s? A. 4.0m B. 6.0m C. 4.5m D. 5.2m 53. Of a book thrown with a velocity of 40m/s in 10s. Compute for final velocity of the book A. 136m/s B. 138m/s C. 140m/s D. 160m/s 54. The increase of velocity of a free falling bodies depends on which of the following reasons. A. Acceleration due to gravity B. Countless particles of air C. Position of an object downward D. None of these 55. Which of the following is the value of acceleration due to gravity? A. 9.801m/s2 B. 9.08m/s2 C. 9.80m/s2 D. 10m/s2