experiment 4 oral report physics

8/18/2019 Experiment 4 Oral Report Physics

1/18

Experiment 4:Work, Power and Energy

Chan, Jan Chester Z.Cruz, Eleazar John .Cruz, !"y #eatri$e %.

Cusi, &ean irshel '.(#!)*

+epartment o #iologi$al&$ien$es

College o &$ien$e

-ni"ersity o &anto omasEspana, %anila Philippines


2/18

Objectives

• To demonstrate conservation of mechanical energy

• To measure change in kinetic and potential energies as a

ball moves in free fall

•To determine power output when going up and downstairs


3/18

Activity 1: Power


4/18

mportant formulas!e"uations

• Weight=mg

m # mass

g # gravitational acceleration of the earth $%&' m!sec()

• Work=Fs

* # force

s # displacement

wherein+ 1 , - m # 1 joule $.)


5/18


• Power= =

wherein+ joule!s # watt $/)

•


6/18

0esults

MEMBER CHAN CRUZ, E. CRUZ, I. CUSI

/eight $,) 23 , 43 , 235 , %5% ,

6O,6 7P/ork $.) 4415 . 4(5 . (215 . 285 .

Time $s) &4' s &'4 s 15&( s &3( s

Power $/) 81% / 233 / (43 / %( /

6O,6 9O/,

/ork $.) 4415 . 4(5 . (215 . 285 .

Time $s) '&25 s '&5 s 11&2 s %&4' s

Power $/) 4%2 / 43% / (11 / 2% /

ertical distance between second floor and third floor # 5.! m


7/18

Activity (: ;nergy of a Tossed


8/18


"i#eti$ e#erg%

• "E=m

m # mass

v # velocity

Pote#ti&' e#erg%

• PE=mgh

m # massg # gravitational acceleration of the earth $%&' m!sec()

h # height above earth=s surface

wherein+ 1 , - m# 1 .oule $.)

•


9/18


Me$hi$&' e#erg%

• ME = "E ( PE

• ME = m ( mgh

•


10/18

0esults


11/18

*ig A > 6raph of potential energy versus time*ig < > 6raph of kinetic energy versus time


12/18

*ig ? > 6raph of mechanical energy versus time


13/18

Activity (: ;nergy of a Tossed


14/18

Post aboratory Buestions and Applications

• 1& Compare the work that you do when you go upstairs to

the work that you do in going downstairs. Based on this,can you explain why it is more difficult to go upstairs than

downstairs?


15/18


16/18


• 4& t is ! minutes before your "#$$ AM class in the fourth

floor and you are still in the ground floor. %ill you run or

walk or walk upstairs in order not to be late? Assume thatyour power output is &! watts and '$ watts when walking

and running, respectively. (he vertical distance between

the ground floor and the fourth floor is &'m and that you

weigh "!$).


17/18


• 2& An ob*ect is thrown vertically up. )eglecting airresistance, how is the change in the potential energy of

the ob*ect related the change in its kinetic energy?


18/18

0eferences

• C1D

6rate+ E?onservation of @echanical ;nergy&F 0etrieved on (5 Gep&

(518 from https:!!www&boundless&com!physics!te-tbooks!boundlessH

physicsHte-tbook!workHandHenergyH!potentialHenergyHandH

conservationHofHenergyH2!conservationHofHmechanicalH energyH('4H

8(1%!

C(D

/olfs+ *& EThe ?onservation of ;nergyF+ 0etrieved on Geptember (5+

(518 fromhttp:!!teacher&pas&rochester&edu!

phy1(1!lecturenotes!?hapter5'!?hapter'&html

• C4D

experiment 4 oral report physics

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