Calculation.
AP calculus 12 book
Mass of the book: I. 7 kg
Initial velocity =om/s
Final velocity=
Acceleration:
Vi=0
Vf=-0.48m/S
a= 0.14m/s^2
d= -0.823m
t= 9.20s
d= Vit+0.5at^2
d= 0.5at^2
A= 0.14m/m2

Vf= √vie +2ad
= (0+2 (0.14)(8.823)
=-0.48m/s

Novel book.
mass of the book= 1.6 kg.
Initial velocity = om/s
Final velocity=
Acceleration=
Vi=o
Vf=~1.62m/s
a =1.6m/s2
d=-0.823m
t=0.800s

d= vit+0.5at2
d=0.5at2
A=1.6m/s2
Vf= √via+2ad
=10+2(1-6) (0873)=-1.62 m/s

file  Physics 11

IMG_0600 IMG_0601
Procedure
a) Choose two books of the same weight and different sizes. Connect each book with an object (355 ml pop) with a string of wool. Hold the weight and release, Then record the speed of falling weights and books to the floor.
b) To see if the type of string affects Ff, change the wool string to a tape string and proceed.
Raw Data:
Height of the table: 0.820m Time:
With Wool String
AP Calculus text book (The one with bigger surface area) 9.20 s Novel book (The one with smaller surface area) 0.800 s
With Tape String
AP Calculus text book (The one with bigger surface area) 11.0 s Novel book (The one with smaller surface area) 1.30s
Challenges and probelms.
It is very difficult to find the book has exactly same weight with different size.
The mass of AP calculus text book is 1.7kg and the mass of Novel book is 1.6kg
Different mass would bring different results, however the differences of mass is very small.
Reflection of Data
All the data did not deviate from expectations. An object with larger surface area takes more time to falling. But the type of string doesn’t affect it, so it has to be tried multiple times.

1. Investigate if surface area is effective on its friction

force

2. Investigate if type of string is effective on its friction

force

Situation

Attach m3 (hanging mass) on a dolly and connect to

the m1(base object) and m2(object over the base)

• Measurement

Determine Ff by changing the size of m1 object

(multiple sizes) to investigate if surface area is

effective on its friction force.

Friction force can be measured by determine what

the mass m3 is. This is because Ff from m1 and m2

should be equal to the Force of gravity from m3.

• Title

Effectiveness of surface area on Friction force