PAPER 2 SECTION A ZULAILI BT YAACOB

QUESTION 4 WHICH CHAPTER ? EXPLAIN : WHY HOW MANY MARK /S 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 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 V2 = (P 1 V 1) / P2 P 1 V 1 = P2 V2 Depth = 0.5, atm pressure 10 m P1 = 0.5 + 10 = 10.5 m P2 = 10 m V2 = ( 5 x 10.5) / 10 = 5.25 cm3

WHICH CHAPTER ? Forces and motion Observed diagram Info from diagram : High ram , low ramp Graph 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 Need Q more High low

Meaning : The amount of energy needed to increase the temperature of 1 kg material by 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. Pt = mc θ P = 800 W, m = 3.5, θ = 900 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

Bouyant force increases when the volume of Immersed wooden block increases Wooden block moving up when Buoyant force > weight B . F equals to weight, the wooden block is floating Explain why the wooden block moves upwards and then floats on the water surface

Aspects Suggestions reasons Low density 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 Reduce water resistance streamline Low density Can float easily Can accommodate all participant Bigger size Layers of bamboo Higher buoyant force Attach big fan / motor /wide sail Increase the speed