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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

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.


PIONEERS of PHYSICS

“All truths are easy to understand once they are discovered; the point is to discover them”.


PIONEERS of PHYSICS

  • JOHANNES KEPLER (1571 – 1630)

  • Formulated the laws of planetary motion or the “first laws of nature”


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”.




HOW FAST OR SLOW OBJECTS OR BODIES MOVE? point.

SPEED  distance traveled over time.

VELOCITY  displacement traveled over time.


CAN YOU CITE EXAMPLES OF SPEED & VELOCITY? point.

 Speed of a school bus is 100kph


 Speed/Rate of heartbeat point.

  • 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.


SPEED OF BLOODFLOW point.

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)


ESCAPE VELOCITY OF PLANET EARTH point.

To escape the Earth’s gravitational pull, an object must reach an escape velocity of 24,840 miles/hr


VELOCITY OF A CAR RACER point.

CAN YOU DIFFERENTIATE SPEED & VELOCITY?


Velocity of a typhoon point.

Typhoon “Ondoy” is traveling approximately 180 kph heading North. (PAGASA)


BIRTHRATE OR SPEED OF POPULATION INCREASE point.

That there are 25 births per 1000 population in the Phils.

AS OF 2007, PHILIPPINE POPULATION IS APPROX. 87 MILLION


COMPUTING THE SPEED AND VELOCITY OF MOVING BODIES point.

Speed ( s ) = distance ( d )

time ( t )

Velocity ( v ) = displacement ( d )

time ( t )

Common units: km/hr, m/s, mi/hr, ft/sec


PROBLEMS INVOLVING SPEED AND VELOCITY point.

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


Speed ( s ) = point.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


CAN YOU IDENTIFY THE GIVEN QUANTITIES FROM THE PROBLEM?


SOLUTION: a speed of 2.5 m/s then:

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.


b. d = ? d = st a speed of 2.5 m/s then:

d = ( 2.5m/s )( 15 s )

d = 37.5 meters

Thus, the nurse must have traveled 37.5 meters in 15 seconds.


VELOCITY a speed of 2.5 m/s then:

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


  • PROBLEM 2: a speed of 2.5 m/s then: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?


Exercise on Speed & Velocity a speed of 2.5 m/s then:

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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