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Home » Aspirant/SSS » Aspirant Brainstorm » Physics 2017 Apsirants Thread Brainstorm.

Hello Aspirants in the house, This thread is created for all physicist students.We will all brainstorm on Various Aspect of physcis, I will Take you some tutorials.I am also an Aspirants oooo, I stand to be corrected.#Physics

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SYLLABUS TOPICS/CONTENTS/ NOTES OBJECTIVES 1. MEASUREMENTS AND UNITS (a) Length, area and volume: Metre rule, Venier calipers Micrometer Screw-guage, measuring cylinder (b) Mass (i) unit of mass (ii) use of simple beam balance (iii) concept of beam balance (c) Time (i) unit of time (ii) time-measuring devices (d) Fundamental physical quantities (e) Derived physical quantities and their units (i) Combinations of fundamental quantities and determination of their units (f) Dimensions (i) definition of dimensions (ii) simple examples (g) Limitations of experimental measurements (i) accuracy of measuring instruments (ii) simple estimation of errors. (iii) significant figures. (iv) standard form. (h) Measurement, position, distance and displacement (i) concept of displacement (ii) distinction between distance and displacement (iii) concept of position and coordinates (iv) frame of reference Candidates should be able to: i. identify the units of length, area and volume; ii. use different measuring instruments; iii. determine the lengths, surface areas and volume of regular and irregular bodies; iv. identify the unit of mass; v. use simple beam balance, e.g Buchart's balance and chemical balance; vi. identify the unit of time; vii. use different time- measuring devices; viii. relate the fundamental physical quantities to their units; ix. deduce the units of derived physical quantities; x. determine the dimensions of physical quantities; xi. use the dimensions to determine the units of physical quantities; xii. test the homogeneity of an equation; xiii. determine the accuracy of measuring instruments; xiv. estimate simple errors; xv. express measurements in standard form. Candidates should be able to: i. use strings, meter ruler and engineering calipers, vernier calipers and micrometer, screw guage ii. note the degree of accuracy iii. identify distance travel in a specified direction iv. use compass and protractor to locate points/directions v. use Cartesians systems to locate positions in x-y plane vi. plot graph and draw inference from the graph. 2. Scalars and Vectors (i) definition of scalar and vector quantities (ii) examples of scalar and vector quantities (iii) relative velocity (iv) resolution of vectors into two perpendicular directions including graphical methods of solution. Candidates should be able to: i. distinguish between scalar and vector quantities; ii. give examples of scalar and vector quantities; iii. determine the resultant of two or more vectors; iv. determine relative velocity; v. resolve vectors into two perpendicular components; vi. use graphical methods to solve vector problems; 3. Motion (a) Types of motion: translational, oscillatory, rotational, spin and random (b) Relative motion (c) causes of motion (d) Types of force (i) contact (ii) force field (e) linear motion (i) speed, velocity and acceleration (ii) equations of uniformly accelerated motion (iii) motion under gravity (iv) distance-time graph and velocity time graph (v) instantaneous velocity and acceleration. (f) Projectiles: (i) calculation of range, maximum height and time of flight from the ground and a height (ii) applications of projectile motion (g) Newton's laws of motion: (i) inertia, mass and force (ii) relationship between mass and acceleration (iii) impulse and momentum (iv) force - time graph (v) conservation of linear momentum (Coefficient of restitution not necessary) (h) Motion in a circle: (i) angular velocity and angular acceleration (ii) centripetal and centrifugal forces. (iii) applications (i) Simple Harmonic Motion (S.H.M): (i) definition and explanation of simple harmonic motion (ii) examples of systems that execute S.H.M (iii) period, frequency and amplitude of S.H.M (iv) velocity and acceleration of S.H.M (v) simple treatment of energy change in S.H.M (vi) force vibration and resonance (simple treatment) (iii) conservative and non-conservative fields (iv) acceleration due to gravity (v) variation of g on the earth's surface (iv) distinction between mass and weight (v) escape velocity (vi) parking orbit and weightlessness Candidates should be able to : i. identify different types of motion ; ii. solve numerical problem on collinear motion; iii. identify force as cause of motion; iv. identify push and pull as form of force v. identify electric and magnetic attractions, gravitational pull as forms of field forces; vi. differentiate between speed, velocity and acceleration; vii.deduce equations of uniformly accelerated motion; viii. solve problems of motion under gravity; ix. interpret distance- time graph and velocity-time graph; x. compute instantaneous velocity and acceleration xi. establish expressions for the range, maximum height and time of flight of projectiles; xii. solve problems involving projectile motion; xiii. solve numerical problems involving impulse and momentum; xiv. interpretation of area under force - time graph xv. interpret Newton's laws of motion; xvi. compare inertia, mass and force; xvii. deduce the relationship between mass and acceleration; xviii. interpret the law of conservation of linear momentum and application xix. establish expression for angular velocity, angular acceleration and centripetal force; xx. solve numerical problems involving motion in a circle; xxi. establish the relationship between period and frequency; xxii. analyse the energy changes occurring during S.H.M xxiii. identify different types of forced vibration xxiv. enumerate applications of resonance. Candidates should be able to: i. identify the expression for gravitational force between two bodies; ii. apply Newton's law of universal gravitation; iii. give examples of conservative and non- conservative fields; iv. deduce the expression for gravitational field potentials; v. identify the causes of variation of g on the earth's surface; vi. differentiate between mass and weight; vii. determine escape velocity 5. Equilibrium of Forces (a) equilibrium of particles: (i) equilibrium of coplanar forces (ii) triangles and polygon of forces (iii) Lami's theorem (b) principles of moments (i) moment of a force (ii) simple treatment and moment of a couple (torgue) (iii) applications (c) conditions for equilibrium of rigid bodies under the action of parallel and non-parallel forces (i) resolution and composition of forces in two perpendicular directions, (ii) resultant and equilibrant (d) centre of gravity and stability (i) stable, unstable and neutral equilibra Candidates should be able to: i. apply the conditions for the equilibrium of coplanar forces to solve problems; ii. use triangle and polygon laws of forces to solve equilibrium problems; iii. use Lami's theorem to solve problems; iv. analyse the principle of moment of a force; v. determine moment of a force and couple; vi. describe some applications of moment of a force and couple; vii. apply the conditions for the equilibrium of rigid bodies to solve problems; viii. resolve forces into two perpendicular directions; ix. determine the resultant and equilibrant of forces; x. differentiate between stable, unstablend neutral equilibra.

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Wokdone, Power, and Energy. Work. In ordinary meaning, work refers to any kind of physical or mental activity. But in physics, work is always associated with movement. Thus, work is said to be done if a force applied makes the object to move a distance in the direction of the applied force. Work is defined as the product of force and perpendicular distance in the direction of the applied force. It is denoted by w, measured in Joule and a scaler quantity. Mathematically; work = force X distance w = f X s since, force = mass X acceleration work = m X a X s. Example: Find the workdone when a force of 5N is exerted on a body through a distance of 10m.(Take g=10m/s-2) Solution. In Physics you have to write your Data(I mean what you have been given in the question) F=5N s=5m W=F*D W=5*10 =50J (Don't forget your units) So the workdone is 50J. Example; A crane lifts a load of 2kg very slowly through a vertical distance of 100cm. Calculate the workdone against gravity if g = 10m/s2. Solution; load=2kg s=100cm=1m a=g=10m/s2. Workdone=F X S w=mas w=2 X 10 X 1 w=20J.

Morning all, Before we proceed in today's class, We need to know some conversions. 1. To convert from mm to cm, "we" divide by 10. 2. To convert from cm to m, "we" divide by 100. 3. Therefore; to convert from mm to m, "we" divide by 1000. 4. To convert from mm2 to cm2, "we" divide by 10 and another 10, why? It is beacuse of the square. 5. To convert from cm2 to m2, "we" divide by 100 and another 100, why? Same as above. 6. To convert from mm2 to m2, "we" divide by 1000 and another 1000, why? Same as above. 7. The standard unit of measurement of length is m not mm. Bonus; To convert mm4 to cm4, "we" divide by 10, and 10, and 10 and 10. Why? The power is 4. 8. To convert form g to kg, we "divide" by 1000 I will updates it as we move on. Before we move on Let us know about Scalar and Vector quantities.

Scalars and Vectors What are Scalar Quantities. A scalar quantity is a quantity that has magnitude but no Direction. Scalar quantity are known for numerical value. Example of Scalar quantity are Speed, Distance etc What are Vector quantities. Vector quantites are quantities that has both magnitude and direction. Eg Velocity, Acceleration, Displacement etc. Let us test our selves. Example: Identify each of the following whether they are vector or scalar quantity. a. 5m- It is a scalar quantity because it has no direction b. 30 m/sec, East - It is a vector quantity because it has direction which is "EAST" c. 5 mi., North- It is a vestor quantity because it has directio which is "NORTH" Classworks Identify the following quantities. a Temperature b 256 bytes c Force d Momentum e Work

Okay sir!

olanrewaju:Scalars and Vectors What are Scalar Quantities. A scalar quantity is a quantity that has magnitude but no Direction. Scalar quantity are known for numerical value. Example of Scalar quantity are Speed, Distance etc. What are Vector quantities. Vector quantites are quantities that has both magnitude and direction. Eg Velocity, Acceleration, Displacement etc. Let us test our selves. Example: Identify each of the following whether they are vector or scalar quantity. a. 5m- It is a scalar quantity because it has no direction b. 30 m/sec, East - It is a vector quantity because it has direction which is "EAST" c. 5 mi., North- It is a vestor quantity because it has directio which is "NORTH" Classworks Identify the following quantities. a Temperature b 256 bytes c Force d Momentum e Work

Solution 1.Temperature- A scalar unit because it has no direction 2.256 byets- A scalar unit because it has no direction 3.Force- A vector unit becuase it has direction "A" accerleration 4.Momentum- A vector unit because it has direction "p=mv" e.Work- A vector unit because it has direction.

olanrewaju:Solution1.Temperature- A scalar unit because it has no direction2.256 byets- A scalar unit because it has no direction3.Force- A vector unit becuase it has direction \"A\" accerleration4.Momentum- A vector unit because it has direction \"p=mv\"e.Work- A vector unit because it has direction.Nice one.. :D

Solution1.Temperature- A scalar unit because it has no direction2.256 byets- A scalar unit because it has no direction3.Force- A vector unit becuase it has direction \"A\" accerleration4.Momentum- A vector unit because it has direction \"p=mv\"e.Work- A vector unit because it has direction.

Heavens lawrence:Nice one.. :D

Noted Sir! Proceed.

Another to note is that, scalar quantities don't have Velocity, while vector quantities do. Like the diagram below.

Morning Class, Today I will treat Circular Motion. First of all what is motion? Motion involves a change of position of a body with time. It also involves how things move and what makes them to move. It exists in different forms and occurs in solids, liquids, and gases. Many scientists have studied motion and its properties because of its importance to life. The Italian, Galileo Galilei did the first systematic study of motion. Also, Sir Isaac Newton did more detailed work on the study of motion. Motion is defined as the change of position of a body with time.

We want to treat the Calculations under Circular Motion. Any where I missed it, correct me please. Circular Motion. Circular motion is a motion in a circular path in which the speed of the body remains constant while its direction continuously changes eg the Earth moving round the sun, a racing car moving round a circular track. The velocity of a body undergoing circular motion is given by; v = wr where v is linear velocity (m/s) w is angular velocity (rad/sec) r is radius (m). The acceleration is given by; a = vw, or a = (wr)w = w^{2}r, or a = v(v/r) = v^{2}/r. Centripetal force. This is the force required to keep object moving in a circular path. Therefore Centripetal force is f = mw^{2}r. where f=force m=mass w=angular velocity

Formulas to note when solving. v=wr a=v^{2}/r f=mw^{2}/r Exercise. An object of mass 10kg moves in a circle at radius 2m at unformed speed of 36m/s. Calculate; (a) the angular velocity (b) the centripetal force. Solution. Number one thing to state is your data. m=10kg r=2m v=36m/s a=? F=? a. V=wr w=36/2=18 b. F=mw^{2}/r =10*18^{2}/2 =1620N

great!.. Following...

Heavens lawrence: great!.. Following...

Evening To all Following !. Please try and invite your friends to this thread. There's a reward for that. Today we will be treating Electrical Power and Energy What is Electrical Energy Electrical energy is the workdone when a quantity of charge moves between two points of potential differences measured in Joule. Mathematically; W = QV; Recall that Q = It. W = IVt-----------(1). Recall that V = IR. W = I^{2}Rt-------(2). W = V^{2}t/R -----(3).

not bad....nice post

P=IV... WHERE I=V/R... P=(V/R) * V... P=(300/7) * 300.... P=42.86 * 300... P=12,857.1WATT..

2. Energy=IVt... I=6... t=15 * 60=900... V=380... Energy=6 * 900 * 380... Energy=2,052kj

Heavens lawrence: 2. Energy=IVt... I=6... t=15 * 60=900... V=380... Energy=6 * 900 * 380... Energy=2,052kj

Heavens lawrence: P=IV... WHERE I=V/R... P=(V/R) * V... P=(300/7) * 300.... P=42.86 * 300... P=12,857.1WATT..

Morning Class, How was night ?, hope you all slept well ? and hope we are all preparing ahead of of Jamb Exam ?. 2017 Jamb registration begins today, in case you are not aware. Let me go straight to the point, Today we are treating "Measurement of Electrical Power', we already explained what we meant by electrical Power, so let us solve some calculations under it. Electrical power consumed by an electrical appliance is measured in watt. The unit of electrical energy is kilowatt-hour. Note these formula's as you will use them. P = IV. W=IVT Where P =Power(Watts) I=Electricity(A) V=Voltage(V) T=Time(S) The formula above is used when cost/money is not involved

1. Since P = IV p=48 V=12 I=? solu. I=48/12, =4A. 2. from reasoning since H=I²RT, for same heating effect and when current is doubled it T(2) becomes I²(1)T(1)=I²(2)T(2), substituting T(1)=4 mins or 4×60s I²(1)×4×60=(2I)²T(2) T(2)=(I²(1)×4×60)/4×I² T(2)=60s or 1mins 3.W=IVT W=I²RT from (V=IR) R=8ohm I=5A T=1mins 40s to 100s substitute W=(5)²×8×100 W=20000watt or 20kW 4.

kk

Nice one @femmy4j No 1. P=48w V=12v I=? I=P/v =48/12 =4A You were asked to find resistance also Therefore V=IR R=12/4=3ohms

Evening Class...Long time... I'm really sorry for not been active in this thread. Hope my apology is accepted ?. That is why we need you to invite your friends to this thread..And if you can take us physics, feel free. Today we will be treating Pressure.. PRESSURE a) AtmosPheric Pressure i) definition of atmosPheric Pressure ii) units of Pressure iii) measurement of Pressure iv) simPle mercury barometer, aneroid barometer and manometer v) variation of Pressure with height vi) the use of barometer as an altmeter b) Pressure in liquids i) the relationshiP between Pressure, dePth and density (P = pgh) ii) transmission of pressure in liquids ( pascal's principle) iii) application. Pressure. Pressure is defined as the force acting at right angle, normal or perpendicular per unit surface area in contact with a substance. Thus, the force applied on the surface area of a substance is called pressure. It is a scale quantity and exists in solid, liquid and gases. Mathematically; Pressure = Force/Area. Example; The weight on the narrow heel of a girl's shoe is 250N and the surface area of the heel in contact with the floor is 50mm2. Determine the pressure exerted on the heel. Solution; F = 250N.c. A = 50mm2 = 50 X 10-6m2. Pressure = Force/ Area = 5 X 106N/m2. Example; Calculate the pressure on the surface of a rectangular box of weight 100N if the base of this box has an area of 2m2. Solution; Weight (Force) = 100N. Area = 2m2. Pressure = Force/Area = 50N/m2.

Nice one @olanrewaju(m).. Proceed Boss..

Afternoon Class. It seems no one is following me.. If you want me to continue, can you please notify so I can know. Thanks

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