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MOTION

MOTION. It is derived from the Greek word “ Kinema ”, meaning “ motion”. Dynamics  study of the causes of motion. Kinematics  describes the positions & motions of objects in space. GALILEO GALILEI ( 1564 – 1642 ) Studied the motion of free falling bodies. PIONEERS of PHYSICS.

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MOTION

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  1. MOTION It is derived from the Greek word “ Kinema”, meaning “motion” Dynamics study of the causes of motion. Kinematics describes the positions & motions of objects in space.

  2. GALILEO GALILEI ( 1564 – 1642 ) • Studied the motion of free falling bodies. PIONEERS of PHYSICS “All truths are easy to understand once they are discovered; the point is to discover them”.

  3. PIONEERS of PHYSICS • JOHANNES KEPLER (1571 – 1630) • Formulated the laws of planetary motion or the “first laws of nature”

  4. ISAAC NEWTON (1642 - 1727) Formulated the laws of motion as well as the law of universal gravitation. PIONEERS of PHYSICS “NO GREAT DISCOVERY WAS EVER MADE W/O A BOLD GUESS”.

  5. “WE LIVE IN A WORLD OF MOTION”

  6. a change of position or place with reference to a fixed point. MOTION WHAT IS MOTION?

  7. HOW FAST OR SLOW OBJECTS OR BODIES MOVE? SPEED  distance traveled over time. VELOCITY  displacement traveled over time.

  8. CAN YOU CITE EXAMPLES OF SPEED & VELOCITY?  Speed of a school bus is 100kph

  9.  Speed/Rate of heartbeat • On a typical day it pumps more than 9,000 liters of blood. • In a typical year it pumps 4.5 million liters of blood. • In a typical lifetime it will beat up to 3,000 million times.

  10. SPEED OF BLOODFLOW Blood flow is the quantity of blood that passes through the arterial or venous circulation within a period of time and is often expressed in milliliters or liters per minute. (approx. 6-50 liters/minute)

  11. ESCAPE VELOCITY OF PLANET EARTH To escape the Earth’s gravitational pull, an object must reach an escape velocity of 24,840 miles/hr

  12. VELOCITY OF A CAR RACER CAN YOU DIFFERENTIATE SPEED & VELOCITY?

  13. Velocity of a typhoon Typhoon “Ondoy” is traveling approximately 180 kph heading North. (PAGASA)

  14. BIRTHRATE OR SPEED OF POPULATION INCREASE That there are 25 births per 1000 population in the Phils. AS OF 2007, PHILIPPINE POPULATION IS APPROX. 87 MILLION

  15. COMPUTING THE SPEED AND VELOCITY OF MOVING BODIES Speed ( s ) = distance ( d ) time ( t ) Velocity ( v ) = displacement ( d ) time ( t ) Common units: km/hr, m/s, mi/hr, ft/sec

  16. PROBLEMS INVOLVING SPEED AND VELOCITY 1.It only takes 0.5 seconds for a rattlesnake to strike its victim. If you are the “victim” and you are 12.5 meters away from the snake then how fast will the snake reach or strike you? Speed ( s ) = ? distance ( d ) = 12.5 meters time ( t ) = 0.5 seconds

  17. Speed ( s ) = distance ( d ) time ( t ) = 12.5 meters 0.5 second = 25 meters/sec Therefore the snake can reach or hit its victim as fast as 25m/s

  18. 2. If a private nurse can cover 5 meters from the ICU with a speed of 2.5 m/s then: • (a) How long will it take her to cover the distance? • (b)How far will the nurse be from the ICU in 15 seconds? CAN YOU IDENTIFY THE GIVEN QUANTITIES FROM THE PROBLEM?

  19. SOLUTION: a) t = ? t = d/s t = 5 m = 2 seconds 2.5m/s Thus, it will only take 2 seconds for the nurse to reach ICU.

  20. b. d = ? d = st d = ( 2.5m/s )( 15 s ) d = 37.5 meters Thus, the nurse must have traveled 37.5 meters in 15 seconds.

  21. VELOCITY PROBLEM 1: Suppose a car traveled 5 miles North East in 0.20 hours then what is the velocity of the car?

  22. PROBLEM 2:Suppose an athlete runs with a velocity of 5 meters/sec Southbound and he is to cover 2 kilometers then: • How far will he be in 5 minutes? • b. What velocity is needed to reach the place in 30 minutes?

  23. Exercise on Speed & Velocity Set 1: 1 & 4 Set 2: 2 & 5 Set 3: 3 & 6 Solve the assigned problem set to you completely: • An ambulance travels 60km in 0.6hr. Find the speed of the ambulance. • A box of supplies in a hospital is being pulled by John from the main door towards the stock room with a velocity of 1.5m/s. If he covered the distance in 45 seconds then how far is the stock room from the main door? • A nurse covered a distance of 20 meters from the nursery to the nurse station in 10 seconds. How fast is he running? • A patient in a stretcher is moved by an attendant with a speed of 2m/s, if the emergency room is 200 meters away then in how many minutes will he make it to the ER? • An ambulance has to pick up a patient 200 kilometers away from Lourdes Hospital. If he has to be in the patient’s house within 1 hour & 40 minutes then what should be the velocity of the ambulance to reach the place in time? • Aldrin moves a patient on a wheelchair from his room to the operating room. If he moves with a velocity of 2 meters/sec and he reached the OR for 1 minute then how far is the OR from the patient’s room?

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