https://padlet.com/liyujiongyang/d15fqhznm6hay5ux Please be considerate en-us 2021-03-07 06:17:06 UTC 2025-10-29 15:15:04 UTC hello@padlet.com liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277752923 Weight and Normal Contact Force

1. Draw weight arrow from the centre of gravity

2. Draw normal contact force arrow from the bottom of the object and pass through the centre of gravity (must be perpendicular to surface)

3. Draw normal contact arrow force same length as weight arrow

4. If the object has specific contact points (like wheels) on a surface, draw the normal contact force arrows from the bottom of the contact points

5. Write Weight and Normal contact force in full, don't write W or Fn unless stated

6. If the object is stationary arrows should be the same length]]> 2021-03-07 06:17:55 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277752923 nathaniel_cheng_le_shan https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277765025 1.  If a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force (Inertia)

2. The acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass. (Factors affecting acceleration)]]> 2021-03-07 06:25:05 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277765025 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277777687 Ek = ½mv²
Ep (Gravitational Potential Energy) = mgh 
F = ma 
Work Done (W) = Fd
Weight (W) = mg
P = F/A
Density = m/vol.
Acceleration = Change of speed (ms⁻¹) / time (s)  
= ms⁻²]]> 2021-03-07 06:33:05 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277777687 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277779840 N - Newtons - Weight, Force
J - Joules - Energy 
Kg - Kilogram - Mass
Pa OR N/m² - Pascals - Pressure


]]> 2021-03-07 06:34:27 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277779840 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277788589 Energy cannot be created or destroyed but converted from one form to another. The total energy in a closed system at any point in time remains unchanged / is always constant ]]> 2021-03-07 06:39:33 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277788589 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277801115 The man exerts an upward force on the box. 
Since the box moves in the direction of the force, work is done by the man on the box]]> 2021-03-07 06:46:08 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277801115 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277804150 The man exerts an upward force on the tray of food. However, the tray of food moves in a direction perpendicular to this force, hence no work is done by the man (on the tray of food) / (against gravity) ]]> 2021-03-07 06:47:50 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277804150 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277808253 Gravitational Field Strength is 10N/kg 

Gravity is Mass x Gravitational Field Strength x Height ]]> 2021-03-07 06:49:50 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277808253 nathaniel_cheng_le_shan https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277810664 When an object gains thermal energy, its particles gain kinetic energy. As the particles vibrate around more and hence collide into each other more, they transfer the kinetic energy, thus the object gains thermal energy.
Conduction involves the flow of thermal energy without the flow of a medium]]> 2021-03-07 06:50:55 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277810664 aidanfooyikai https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277811629 1. What is it: It is the transfer of thermal energy through electromagnetic waves like infra-red radiation from the surface of a body.
it does not require a medium(but can occur through one).
2. Examples of where it is used: Cooling Fins, Fuel Tanks]]> 2021-03-07 06:51:22 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277811629 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277812938 _
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]]> 2021-03-07 06:52:03 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277812938 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277813503 2021-03-07 06:52:22 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277813503 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277814881 2021-03-07 06:53:07 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277814881 nathaniel_cheng_le_shan https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277818303 When a fluid gains heat, it expands and becomes less dense. causing it to rise. When it rises to a cooler area, the fluid loses heat, contracts and becomes denser. This causes the fluid to sink to a warmer area, where it gains heat again and rises, continuing the cycle. Convection involves the transfer of heat through bulk movement of particles or substances.]]> 2021-03-07 06:54:48 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277818303 https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277818650 pressure is the force exerted on per unit area]]> 2021-03-07 06:55:00 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277818650 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277823027 2021-03-07 06:56:58 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277823027 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277828857 2021-03-07 06:59:47 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277828857 aidanfooyikai https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277831461 1. Surface temperature of body->higher temperature, greater the rate of thermal emission

2. Surface area of body
->larger surface area, greater rate of heat absorbed from surroundings or emitted to surroundings

3.Colour and texture of surface->shiny, white and smooth=poor emitters/absorbers of radiation; black, dull and rough surfaces=good emitters/absorbers of radiation (why is this so?-shiny and glossy materials are better reflectors of infra-red radiation)]]> 2021-03-07 07:01:05 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277831461 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277833223 2021-03-07 07:02:09 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277833223 aidanfooyikai https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277840607 -all objects radiate infra-red radiation
-radiation that enters a greenhouse is absorb by the plants and re-radiated as lower energy radiation which cannot be pass through the glass and would be trapped. This causes the greenhouse effect.]]> 2021-03-07 07:06:32 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277840607 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277853902 Acceleration is an object increasing in velocity (basically change in speed)

Gravitational Potential Energy is a type of acceleration 

Velocity can be assumed to be the same as speed

 ]]> 2021-03-07 07:13:30 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277853902 https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277861555 2021-03-07 07:17:15 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277861555 https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277866881 2021-03-07 07:19:58 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277866881 aidanfooyikai https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277867326 Weight: Spring Balance
Mass: electronic balance or beam balance]]> 2021-03-07 07:20:13 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277867326 aidanfooyikai https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277879697 Heat: Transfer of thermal energy, Transferred from region of higher to lower temperature
Temperature: Type of measurement, indication of how hot or cold an object is]]> 2021-03-07 07:26:29 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277879697 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277879802 2021-03-07 07:26:33 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277879802 aidanfooyikai https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277890652 metals are better conductors of heat because metals have mobile delocalised electrons, which are smaller than atoms . These mobile delocalised electrons when heated gain kinetic energy and increase in speed. These mobile electrons would then collide with the metal atoms and help transfer thermal energy in addition to the vibrating and colliding metal atoms]]> 2021-03-07 07:31:55 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277890652 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277916361 Should not put pressure as N/cm², instead put it as N/m² ]]> 2021-03-07 07:43:28 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277916361 MN2012021LUKECOJ https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277938048 2021-03-07 07:52:28 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277938048 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277941810 2021-03-07 07:53:49 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277941810 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277951667 First, manupilate the equation in y = mx + c 
then draw the graph ]]> 2021-03-07 07:57:02 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277951667 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277955892 2021-03-07 07:58:58 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277955892 liyujiongyang https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277956718 _
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2. Linear Inequalities
3. Quadratics - simplifying and factorising (Chap 3 and 4)]]> 2021-03-07 08:07:03 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277973447 nathaniel_cheng_le_shan https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277973616 2021-03-07 08:07:07 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277973616 https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277980054 2021-03-07 08:09:59 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277980054 tharunpugalanthi https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277992984 What are the fundamentals? ]]> 2021-03-07 08:16:50 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1277992984 krishnaaram https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1278491355 F = Force
f = friction]]> 2021-03-07 13:09:06 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1278491355 krishnaaram https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1278496689 Ek2 + Wf = Ek1]]> 2021-03-07 13:12:06 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1278496689 sharrwinsenthilkumar https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1279671813 There isn’t ]]> 2021-03-08 00:18:05 UTC https://padlet.com/liyujiongyang/d15fqhznm6hay5ux/wish/1279671813