PAPER 2 SECTION A

ZULAILI BT YAACOB

QUESTION 4WHICH CHAPTER ?

WHICH PRINCIPLE OR LAW

HOW MANY MARK /S

EXPLAIN : WHY

1 – PRESSURE INVERSELY PROPORTIONAL TO VOLUME 2 – PRESSURE AT SURFACE IS DECREASES, VOLUME OF AIR IS INCREASES

BOYLE’S LAW

Fresh water replace by higher density?

Density higher pressure higher ( P = ρgh)

Pressure higher volume less

The volume will decreases at R.

An air bubble of volume 5 cm3 is released by an air pump at depth of 0.5 m. Calculate the volume of the air bubble when it reaches the surface of the water.[ Assume that the atmospheric pressure is 10 m water ]

EXTRACT INFORMATION FROM QUESTION :

V1 = 5 cm 3 , depth = 0.5 m, atm pressure = 10 m

P 1 V 1 = P2 V2

Depth = 0.5, atm pressure 10 m P1 = 0.5 + 10 = 10.5 m

P2 = 10 m

V2 = (P 1 V 1) / P2

V2 = ( 5 x 10.5) / 10

= 5.25 cm3

WHICH CHAPTER ?

Forces and motion

Observed diagram Info from diagram :

High ram , low rampGraph of velocity vs time

Quantity by the gradient

Velocity ms-1

Time s

Unit ms-2

acceleration

Comparing gravitational potential energy :

The gravitational potential energy in diagram 5.1 is higher compare to diagram 5.2

Comparing velocity :

Velocity of diagram 5.1 is greater compare to diagram 5

Comparing kinetic energy:

Kinetic energy of diagram 5.1 is higher compare to 5.2

Relationship between gravitational energy and kinetic energy

When the gravitational energy increases, the kinetic energy increases

Physics concept :

Conservation of energy

Skate from Z to Q

Velocity decreases

Kinetic energy at Z > Kinetic energy at Q

Q = mcθ

High

low

Need Q more

Meaning :

The amount of energy needed to increase the temperature of 1 kg materialby 10 C or 1 K

Cooking rapidly : material :

copper Spesific capacity low

Material for handle : polymer

insulator

Mass of the pot :Low mass

Easy to carry

•The pot are heated by using an electric hot plate of power 800 W.

Based on the information in table 8 , calculate the time to achieve a temperature rise of 900 for :

Extract information from given statement.P = 800 W, m = 3.5, θ = 900Pt = mc θ

t = (mc θ) P

354.4 s / 5.91 min

109.7 s / 1.83 min

PAPER 2 SECTION B

Weight : Force exerted on every object

Compare weight of the boy with his father : The weight of his father is greater than the boy

The volume of water displaced :

The volume of water displaced by ball B is greater than ball A

The buoyant force acted on them

The buoyant force acted on the father is greater than the boy

Relationship buoyant force and volume of water displaced

When the water displaced increases, the buoyant force increases

Relationship buoyant force and weight of water displaced

When the weight of water displaced increases, the buoyant force increases

Archimedes principle

Explain why the wooden block moves upwards and then floats on the water surface

Bouyant force increases when the volume of Immersed wooden blockincreases

Wooden block moving upwhenBuoyant force > weight

B . F equals to weight,the wooden block is floating

Design a raft to accommodate 15 participant and able to move quickly

Aspects Suggestions reasons

Shape of the raft

Material for the raft

Size of the raft

Design of the raft

streamline Reduce water resistance

Low density Can float easily

Bigger size Can accommodate all participant

Layers of bamboo Higher buoyant force

Attach big fan / motor /wide sail

Increase the speed