Physics Free Fall TchrSab

Free fall/Jatuh Bebas
Physics F4

(Text book page 46-51)

2.0 FORCE AND MOTION
2.3 FREE FALL MOTION
2an.3d.1 Egrxapvliataintiownitahl aexccaemleprlaetiFornee Fall motion
2.3.3 gSroalvveitaptrioobnlaelmasccinelveorlavtiinogntfhoer oeabrjethct’ss in

free fall.

With TchrSab



Definition :
A free falling object is
an object falling under
the influence of gravity
only.

Youtube Video link :

Freely Falling Objects and Acceleration Due to
Gravity :

https://youtu.be/Sw2P1hpwpqU

This video explains the concept of free fall, motion and

gravity for objects very close to the earth.

(Link Youtube shared in google classroom 4B/4E)



Objects accelerate equally.
Both objects reach the
bottom at the same time.

- In vacuum, there is no air.
- It means there is no air

resistance.
- surface area and mass does

not affect free fall



Gravitational force, Fgrav = 9.8
m/s²

Fgrav at equator = 9.78
m/s²
Fgrav at the poles = 9.83 m/s²

Buku Teks m/s 49



Free-fall : the only force acting upon an object is gravitational
force, Fgrav.
From F = ma, where F = Force , a = acceleration, m = mass
We can determine acceleration due to gravitational force.

a = F /m

Although the mass of these
rocks are different,
a is the same for each rock
under situations involving
free fall.

a is equivalent to the

acceleration of the object.

(Link Youtube shared in google classroom )





Solving problems involving Free fall.

Please refer to the text book page 50 :
“Contoh 1”

Sketch
diagram to

better
understand

the
Doqutheestsioanm. e
with “Contoh

2”

Lets try to do this question .....( 6 marks)

A ping pong ball and a golf ball of a same size,
were released from a height of 10 m as shown
in diagram 3.
Sebiji bola ping pong dan bola golf yang sama
saiz dilepaskan dari ketinggian 10 m seperti
yang ditunjukkan dalam rajah 3.

i. What is the meaning of free fall?
Apakah maksud jatuh bebas /

ii. Will the ping pong ball and the golf ball reached the bottom of the hill at the same time?
Adakah bola ping pong dan bola golf itu akan sampai ke kaki bukit pada masa yang sama?

iii. Give reason for your answer in b(i)
Berikan sebab bagi jawapan anda dalam b(i)

iv. Determine the time for the ping pong ball and the golf ball to reach the bottom of the hill.
Tentukan masa untuk bola ping pong dan bola golf itu sampai ke kaki bukit..