Physics Ssss

7/29/2019 Physics Ssss

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QUICK FUN RUNACTIVITY 2

General Physics/ BSMT2-C

Group 5

Anog, Jonalyn B. 3

Galat, Myca E. 17

Madriaga, Kennette Mae 24

Sabado, Jernet Shae 38

Tan, John Mark C. 43

August 13, 2012


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Meter

OBJECTIVES

1. To be able to exercise our skills on how tofind the unknown in given calculations.

2. To be able to apply and test Newtons Laws ofMotion

3. To exercise alertness and presence of mindduring the activity

4. To be able to calculate speed/velocity

LIST OF APPARATUS

An openSand

Tennis

Stopwat

Ballpen

and

Chalk


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THEORETICAL BACKGROUND

Newton's First Law (Law of Inertia)

An object at rest will stay at rest, forever, as

long as nothing pushes or pulls on it. An object in

motion will stay in motion, traveling in a straight

line, forever, until something pushes or pulls on

it.

The "forever" part is difficult to swallowsometimes. But imagine that you have

three ramps set up as shown below. Alsoimagine that the ramps are infinitely longand infinitely smooth. You let a marbleroll down the first ramp, which is set at aslight incline. The marble speeds up onits way down the ramp. Now, you give a

gentle push to the marble going uphill onthe second ramp. It slows down as it goes up. Finally, you push amarble on a ramp that represents the middle state between the firsttwo -- in other words, a ramp that is perfectly horizontal. In this case,the marble will neither slow down nor speed up. In fact, it should keeprolling. Forever.

According to Newton's first law, the marble on that bottom rampshould just keep going.


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Physicists use the term inertia to describe this tendency of an objectto resist a change in its motion. The Latin root for inertia is the sameroot for "inert," which means lacking the ability to move. So you cansee how scientists came up with the word. What's more amazing is thatthey came up with the concept. Inertia isn't an immediately apparentphysical property, such as length or volume. It is, however, related toan object's mass. To understand how, consider the sumowrestlerandthe boy shown below.

Let's say the wrestler on the left hasa mass of 136 kilograms, and theboy on the right has a mass of 30kilograms (scientists measure mass inkilograms). Remember the object ofsumo wrestling is to move your

opponent from his position. Which person in our example would beeasier to move? Common sense tells you that the boy would be easierto move, or less resistant to inertia.You experience inertia in a movingcarall the time. In fact, seatbeltsexist in cars specifically to counteract the effects of inertia. Imaginefor a moment that a car at a test track is traveling at a speed of 55mph. Now imagine that a crash test dummy is inside that car, riding inthe front seat. If the car slams into a wall, the dummy flies forward into
http://entertainment.howstuffworks.com/pro-wrestling.htmhttp://entertainment.howstuffworks.com/pro-wrestling.htmhttp://entertainment.howstuffworks.com/pro-wrestling.htmhttp://auto.howstuffworks.com/car.htmhttp://auto.howstuffworks.com/car.htmhttp://entertainment.howstuffworks.com/pro-wrestling.htm


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the dashboard. Why? Because, according to Newton's first law, anobject in motion will remain in motion until an outside force acts on it.When the car hits the wall, the dummy keeps moving in a straight lineand at a constant speed until the dashboard applies a force.Seatbelts hold dummies (and passengers) down, protecting themfrom their own inertia.

Interestingly, Newton wasn't the first scientist to come up with the lawof inertia. That honor goes to Galileo and to Ren Descartes. In

fact, the marble-and-ramp thought experiment described previously iscredited to Galileo. Newton owed much to events and people whopreceded him.


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DATA AND RESULTS

Name Run Walkdy dx

t(15m)

spe

edtf

dx t(15m)

spe

ed

t

John Mark C.

Tan

0.97

m

0.57

m

3.24

s

4.63

m/s

0.25

m

7.60

s

1.

97

m/s

0.

3

Jonalyn B. Anog 1.03m

0.44

m

4.32

s

3.47

m/s

Jernet Shae

Sabado

0.37

m

4.51

s

3.33

m/s

0.40

m

8.93

s

1.68

m/s

0.

4

Kennete Mae

Madriaga

0.9

m

0.48

m

4.24

s

3.54

m/s

Myca Galat 1.00m

0.51

m

3.58

s

4.19

m/s

soln:

1. Speed (s)= d/t

=15m/3.24s

2. Time of Fall (tf)

Dy=Vot+1/2gt2

0.97m=4.63m/s(3.24s)+1

/2(9.8

=4.63m

Fig.1


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INTERPRETATION OF DATA

The given data shows the results upon getting the time,

distance, speed and the time of fall. In getting the dx we

measured the distance from where the ball was dropped to the

main target, while in getting the speed we used the formula

s=d/t. On the other hand, the formula dy=vot+1/2gt2 is used

to measure the time of fall, or simply the time used by the ball

from the moment you dropped it until it is shoot at the container,

which is the target per se. This formula we used showed the

relationship of the speed of that person so as to the ball as she

dropped it.

All of us run and only two of us do the walkathon, it

showed that the faster you run/walk it must be expected that

the measurement of the distance from where the ball was thrown

to the main target is relatively shorter compared to those who

consume a greater time to accomplish the given task. Thus, the

dimensions of the distance and time affect each other.


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CONCLUSION

Based from the results of our experiment, we conclude

that the ball moves forward as you drop it from running. It could be

said that the speed of the ball as you dropped it and hit the target

is the same as the speed of the person running or walking. It would

require you several times to run and walk before you could hit the

target which is a narrow-mouthed container (C2). In running, since

it moves in a trajectory, the farther you dropped the ball from the

target the more chances of it to be shoot in the bottle that is if your

speed is fast. Therefore, the faster youre running the farther you

should drop the ball in order to hit the target. While, if youdropped the ball while walking, since your speed is obviously slower

than running, you must dropped the ball much nearer than the

target to hit it, or right above it. The ball moves in a slight forward

motion or in a straight line downward- that still depends on your

speed.

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