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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

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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

“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”.

“WE LIVE IN A WORLD OF MOTION”

a change of position or place with reference to a fixed point.

MOTION

WHAT IS MOTION?

HOW FAST OR SLOW OBJECTS OR BODIES MOVE?

SPEED  distance traveled over time.

VELOCITY  displacement traveled over time.

CAN YOU CITE EXAMPLES OF SPEED & VELOCITY?

 Speed of a school bus is 100kph

 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.

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)

ESCAPE VELOCITY OF PLANET EARTH

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

VELOCITY OF A CAR RACER

CAN YOU DIFFERENTIATE SPEED & VELOCITY?

Velocity of a typhoon

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

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

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

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

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

• 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?

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.

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.

VELOCITY

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

• 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?

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?