Forces, Density and Pressure by Muhammad Mirza Bin Mahshar

Forces, Density and Pressure by Muhammad Mirza Bin Mahshar https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz Made with students tear for success en-us 2020-05-21 05:40:00 UTC 2024-05-28 04:29:45 UTC hello@padlet.com https://padlet.net/icons/png/1f680.png ALIFF mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329784 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329784 Definition of Density mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329787 Density is the mass per unit volume of a substance
SI Unit: kg/m ³

]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329787 Example Of Density mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329788 The density of water is approximately 1000 kg/m ³]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329788 Real Life Application Of Density mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329789 Diving and Surfacing of modern submarines]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329789 How does it work? mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329792 Submarines have tank like structures called Ballast Tanks.
Concepts:-
1) The submarine's volume is constant
2) The submarine's mass varies as it dives and surfaces]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329792 Diving mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329794 Sea water fills the submarine's Ballast Tank through the valves,
the sub's mass increases but its volume remains the same,
the submarine's density increases thus the sub will dive deeper into the sea.]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329794 Surfacing mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329795 Sea water exits the Ballast Tank through the valves,
the sub's mass decreases but the volume remains constant,
the submarine's density decreases thus the sub will rise to the surface of the sea.]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329795 Density mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329796 ALIFF HAKIMI BIN EYSAMUDEEN (AE19D)]]> 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329796 Overview (Handwritten Mind-map) mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329797 2020-05-21 05:40:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586329797 Rotational Force mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586332870 MUHAMMAD MIRZA BIN MAHSHAR (AE19D)]]> 2020-05-21 05:43:20 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586332870 Couple mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586337834 Pair of forces that produce rotation only]]> 2020-05-21 05:48:34 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586337834 Forming Couple mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586340799 1. Equal in magnitude
2. Parallel but in opposite directions
3. Separated by a distance s]]> 2020-05-21 05:52:17 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586340799 Moment mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586343082 Product of the force and the perpendicular distance of its line of action to the pivot]]> 2020-05-21 05:55:02 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586343082 Torque of A Couple mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586345766 The product of one of the forces of the couple and the perpendicular distance between the lines of action of the forces.

Torque = Force × ⊥ Distance between Forces]]> 2020-05-21 05:58:14 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586345766 Unit of Moment mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586347660 N m

(Product of forces and its perpendicular distances from the pivot)]]> 2020-05-21 06:00:15 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586347660 Principle of Moment mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586349358 For a body to be in equilibrium,
the sum of all the anticlockwise moments about any
point must be equal to the sum of all the clockwise
moments about that same point.]]> 2020-05-21 06:02:00 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586349358 Condition for Equilibrium mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586350211 1. Resultant force acting on it in any direction equals
zero
2. Resultant torque about any point is zero.]]> 2020-05-21 06:02:57 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586350211 Usage of moment and couple mirzamahshar13 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586351416 2020-05-21 06:04:15 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/586351416 Pressure msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587102692 MUHAMMAD SYABIL BIN MOHD SOBERI (AE19D)]]> 2020-05-21 14:38:12 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587102692 Definition of Pressure msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587105340

Pressure is normal force acting per unit cross-sectional area

Unit SI = Pa/Nm^-2

]]> 2020-05-21 14:39:09 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587105340 Pressure in fluid msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587156832 -Affected by 3 factors :-

depth, h
density of liquid, p
acceleration of gravity, g

Pressure = pgh

]]> 2020-05-21 15:00:46 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587156832 Deriving pressure in fluid from P = F/A msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587171831 F/A = Nm^-2
hpg = m x kgm^-3x Nkg^-1
= Nm^{-2

P = F/A = W/A, W = mg
P = mg/A,}^p^{= m/v
P =}^p^{Vg/A, v = Ah
P =}^p^{(Ah)g/A
P =}^p^hg]]> 2020-05-21 15:07:22 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587171831 Forces uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587365159 in simplest terms - a push or a pull]]> 2020-05-21 16:32:12 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587365159 Equation uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587367389 - F = ma
m is mass (kg)
a is acceleration (ms^-2)]]> 2020-05-21 16:33:07 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587367389 Types of forces uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587377741 1. weight - mg - force of gravity acting on an object
2. friction - force that resists motion
3. drag - similar to friction, but involving air molecules
4. upthrust - upwards force on an object placed in a fluid (ie. water or air)
5. contact force - normal reaction of an object
6. tension - aka tensile force (usually involving a rope, string, or a spring)]]> 2020-05-21 16:38:01 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587377741 Weight uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587385578 - EQUATION = W=mg
m is mass in kg, g is acceleration due to gravity (ms^-2) or (Nkg^-1)
- SI unit - N (newton)
- weight varies from place to place (always depends on g/acceleration due to gravity)
- mass is always constant but weight of an object on one planet is different than on another planet
- Weight is directly proportional to mass]]> 2020-05-21 16:41:29 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587385578 Friction uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587398178 - Unit = N (newton)
- frictional force is directly proportional to contact force
- resists movement of an object in conctact with a surface (more friction, harder for the object to be in motion)
- ratio of friction to contact force IS the coefficient of friction μ (greek letter mu)
- if an object is in motion, applied force > frictional force
- if there is no motion, applied force = frictional force
- F(net) = F(applied) - F(friction)
- F_L = μ N (F is the frictional force, N is the normal reaction force)

]]> 2020-05-21 16:47:12 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587398178 uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587401893 2020-05-21 16:48:46 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587401893 Drag/Air Resistance uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587414808 - acts opposite to the direction of motion of an object moving through a fluid
- examples: airplanes experience drag in air, cars experience drag when driven, a falling object experiences drag
- example situation: when an object is falling, its acceleration is constant (g due to gravity), weight is the downward force. drag/air resistance acts upwards opposite to the direction of weight. as the object increases in velocity, the amount of drag increases. eventually, drag = weight. when this happens, the acceleration becomes zero. since F=ma, when a=0, the net force is zero. hence, the object reaches terminal velocity. it falls down at a constant velocity after it reaches terminal velocity ]]> 2020-05-21 16:54:36 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587414808 uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587416954 2020-05-21 16:55:38 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587416954 Upthrust uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587428672 - force that pushes an object upwards when immersed in a fluid
- makes it seem the object is losing weight (lighter)
- also known as buoyancy
- examples: keeps a ship afloat, a swimmer from sinking, keeps any object afloat in water
- upthrust = weight of fluid displaced
- weight of object = upthrust + viscous drag]]> 2020-05-21 17:01:15 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587428672 uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587431553 2020-05-21 17:02:36 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587431553 Forces on an Inclined Plane uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587453125 2020-05-21 17:12:47 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587453125 Contact Force uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587465232 - due to two objects being in contact with each other
- example: for an object on a table, weight acts downwards, the contact force (normal reaction force) acts upwards (from table to object)
- if on an inclined plane: contact force = Wcos(theta)]]> 2020-05-21 17:18:46 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587465232 Contact force for a ladder uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587467480 2020-05-21 17:19:50 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587467480 Newton's Laws of Motion uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587470070 basis for studying forces]]> 2020-05-21 17:21:07 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587470070 Tension uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587476780 - the "pulling" force by a string/cable/rope etc.
- tension = weight of supported mass
- T = w = mg]]> 2020-05-21 17:24:21 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587476780 Tension (continued) uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587484784 In a pulley system:
- mg - T = ma (for a non stationary object moving downwards)
- T - mg = ma (for a non stationary object moving upwards) ]]> 2020-05-21 17:28:25 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587484784 Tension not vertical or perpendicular uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587489977 - usually on suspended mass
- use resolution of forces to find the tension [mgsin(theta) and mgcos(theta)]]]> 2020-05-21 17:30:59 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587489977 Upthrust (continued) uzaireddieham https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587494430 2020-05-21 17:33:08 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587494430 Determining pressure at certain depth msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587596532 Additional note : pressure in fluid is not affected by the shape of the container, total mass or the surface area

Let's say the
1) Height, h : 40cm
2) Density, p : 1000

the pressure will be
P = phg
= 1000 x 0.4 x 9.81
=3924 Pa/Nm^{-2

All of the beakers will have the same pressure at the same depth
All value must be converted into SI Unit}]]> 2020-05-21 18:14:10 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587596532 General calculation of pressure in fluids msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587619876 2020-05-21 18:26:29 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587619876 GUMBALL AE19D msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587622453 2020-05-21 18:27:56 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587622453 Calculating pressure in manometer msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587633960 Step 1 :
Determine the difference in height h of the water on the two sides of manometer

h = 60 - 30 = 30 cm

Step 2 :
Because the level of water on the side of the tube next to the gas pipe is lower than on the side open to the atmosphere, the pressure in the gas pipe is above atmospheric pressure.

Pressure difference = p x g x h = 1000 x 9.81 x 0.3
= 2940 Pa]]> 2020-05-21 18:33:50 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587633960 Real life applications of Pressure in Fluids msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587655140 Blood transfusion

The bottle is hung at a higher position to increase the pressure of the liquid
So it has a sufficient pressure to flow into the patient's vein

]]> 2020-05-21 18:45:12 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587655140 Real life applications of Pressure msyabil26 https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587661182 Nail is made with a sharp tip
Therefore the cross-sectional area of the tip is very small
cross-sectional area is inversely proportional to Pressure
Higher pressure will produce]]> 2020-05-21 18:48:38 UTC https://padlet.com/mirzamahshar13/zvd268w7qzwytsnz/wish/587661182