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PHYSICS class

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PHYSICS class

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How do I go about to get the Online Lectures and u want to know the days I can come online for the tutorials because I'm always kind of busy...

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PHYSICS class

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Story Story

1. Work, energy and power:- Concept of work, energy and power - Transformation and conservation of mechanical energy. - World energy resources

2. Heat Energy:- Differences between heat and temperature - Kinetic molecular theory

- Effects of heats - Thermal expansivity - Change of state

3. Heat Transfer:conduction, convection, radiation and their applications.

4. Electrostatics

5. Gas laws:Boyle’s and Charles’ law and their applications. - Pressure law, general gas law

- Molecular theory explanation of gas laws.

6. Current Electricity : - Lines of forces - Potential difference, current and resistance

- Ohms law - Electrical energy and power - Electric cells

7. Fibre optics and LAZER technology

let us do some work b4 we close for today's class

WORK:work can be defined in several ways but let me tell u the one you will never forget in hurry

WORK IS DONE WHEN A FORCE MOVES A BODY IN THE DIRECTION OF THE FORCE. From this small definition we can see that work can not be done.

NOTE BELOW:

Common symbols =W

SI unit = joule (J)

In SI base units1 kg⋅ m2/ s2

Derivations from

other quantities

W= F⋅ s

W= τ θ

we will discuss more on our next class

PLEASE IF YOU HAVE QUESTIONS YOU CAN USE COMMENTS TO ASK YOUR QUESTIONS have a nice day.

Story Story

1). The eat from the sun reaches the earth by the process of ?

Answer

( Radiation )

2) Three 5 ohm resistors connected in parallel have a potential difference of 60V applied across the combination. The current in each resistor is ?

Answer

12A

3)The fictional force between two bodies -----

Answer

Depends on the normal reaction between the two surface

4) An air force jet flying with a speed of 335 rns-1 went past an anti aircraft gun, how far is the aircraft 5s later when the gun was fired -----------------

Answer

Distance covered = speed * time = 335 * 5 = 1675 m

5) The internationally agreed system of units (IS) for physical measurement are

Answer

Kg,m,ser

6) An ice cube floats in a glass of water filled to the brim, what happens when the ice melts

Answer

The water level remain the same

7) Mercury is better barometric fluid than water because

Answer

It needs no colouring and it's density is many time greater than water

8 ) To determine the weight of an object you could

Answer

Use a spring balance

9) The density of a solid is define as the

Answer

Mass per unit volume of the solid

10) The amount of heat require to raise the temperature of a body is

Answer

Thermal capacity

Story Story

150cm

12) An object 1cm high placed on the axis 15cm from a converging lens from an image 30cm from the lens

The size of the image is

2cm

13) Why is it impossible for the lines of force of an electric field to cross one another

A positively charged particle xan travel in only one direction at a time.

14) A magnet is moved through a coil of wire. The e.m.f produced in the wire depends on

The strength of the magnet

15) A potential difference of 6V is used to produce a current 5A for 200s through a heating coil.

The heat produced is ---

Heat energy = elect energy = IVt = 5*6*20=6,000J

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Mr Solution

MASS AND WEIGHT

Mass is defined as the quantity of matter in a body. It is

measured in Kilogram (kg), e.g. The mass of a body such

as bag, book etc.

The weight of an object is defined as the earth pull of

the body, i.e. Force acting on an object due to

gravitational pull of the Earth. It is measured in Newton

(N). It is a vector quantity which varies from place to

place on the Earth's surface because of the;

1. Distance of object to the centre of the Earth.

2. Shape of the Earth.

3. Force of attraction of the body to the centre of the

Earth.

The relationship between the mass and weight is given

by;

w=mg

where w is weight (N)

m is mass (kg)

g is acceleration due to gravity (m/s2).

Example; Calculate the weight of an object whose mass

is 12kg. [g=10m/s2.

Solution;

1. Write out the parameters given.

M=12kg

g=10m/s2

w=?

2. What is/are the relationship between the

parameters?..............................very good.

W=mg.

3. Calculation

w= 12 X 10

w= 120

w= 120N (unit is very very very very important in

physics).

Example; Calculate the weight of an object whose mass

is 5000g. (g=10m/s2).

Solution; 1. Write out the parameters........very good but,

the standard unit of mass is Kg not g.

2. Convert all unit(s) into standard unit in physics. Your

knowledge in mathematics is needed here, if

1000g=1kg

5000g=?..........

Very good, 5kg.

3. The relationship is? Very good...............

W=mg

w= 5 X 10

W= 50N.

Example; Calculate the mass of an object whose weight

is 45N. (g=10m/s2). Leave your answer in gram.

a. 4.5kg b. 4500g.

Solution; 1. Write out your parameters.

2. Relationship, w=mg.

3. calculation;

w=mg

45 = m X 10.

Mathematics again, this is change of subject.

Divide both sides by 10.

M = 4.5

the unit of m above is?..............very good kg.

M = 4.5kg. Option a is very very very correct but the

conditional statement ruled it out.

4. Watch out for conditional statement, mathematics

again, if

1kg=1000g. Then,

4.5kg=?...........very good, 4500g which is option b.

Note;

1. Acceleration due to gravity is more at the poles and

less at the equator (this is due to reasons 1 and 2 above

but 1 leads the way).

2. g Earth=6gmoon (i.e. g on Moon is 6times g on Earth).

Explanation; if two objects are dropped from equal

height in Earth and Moon, the object on the Moon will

get to the surface before the object on Earth.

Mass;

1. Mass is constant.

2. Mass is a scaler quantity.

3. Mass is the quantity of matter present in a body.

4. Unit is kg or g.

5. Mass is measured btw chemical/beam balance based

on principle of moment.

Weight;

1. Weight varies.

2. Unit is Newton(N).

3. Weight is a vector quantity.

4. Weight is Earth's pull of the body.

5. Weight is measured by spring balance based on

Hooke's law.

Mr Solution

A body of mass 25kg moving at 3m/s on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor. Calculate the coefficient of sliding friction[g=10m/s2]

S=2.5m m=25kg v=3m/s but F X S=1/2mv^2.

1/2 x 25 x (3)^2 =112.5

F X 2.5=112.5 F=112.5/2.5=45N

u=F/mg =45/25 x10 =45/250

u=0.18

Mr Solution

Fundamental units are the accepted standard units or

measures in which measurement is made.

They are;

1. Metre as the unit of length.

2. Kilogram as the unit of mass.

3. Second as the unit of time.

4. Ampere as the unit of current.

5. Kelvin as unit of temperature.

6. Weber as unit of magnetic flux.

7. Candela as unit of luminous intensity.

Derived units are new units derived from fundamental

units.

They are derived from combinations of

fundamental units.

Let us derive the unit of the following physical

quantities together.

1. Area = length X breadth.

Length is measured in metre so also is breadth.

Area = m X m = m2.

2. Volume = length X breadth X height.

Volume = m X m X m = m3.

3. Speed = distance/time.

Distance is measured in metre while time is in second.

Speed = metre/second = m/s.

4. Velocity = displacement/time.

Displacement is measured in metre.

Velocity = metre/time = m/s.

5. Density = mass/volume.

Mass is measured in kilogram.

Density = kilogram/metre3.

Density = kg/m3.

Fundamental and Derived Quantities.

Fundamental quantities are the basic quantities that

provide the standard units of measurement. They are;

1. Length.

2. Mass.

3. Time.

4. Temperature.

5. Current.

6. Magnetic flux.

7. Luminous intensity.

Derived quantities are obtained from fundamental

quantities. Examples include;

1. Charge = current X time.

2. Speed = distance/time.

Dimension of physical quantity.

Dimension of physical quantity simply means the way it

is related, connected or associated to fundamental

quantities.

The dimensions are

1. M - mass.

2. L - length.

3. T - time.

4. K - temperature.

5. A - current.

6. II - luminous intensity.

Lets consider the dimension of some physical quantities

together.

1. Speed = distance/time.

The dimension of distance is m,...................opps, you are

wrong, that's the unit, the dimension is L while the

dimension of time is?..............................very good, T.

Speed = L/T.

2. Velocity = displacement/time.

The dimension of displacement is?...........................L, very

good.

Velocity = L/T.

3. Momentum = mass X velocity.

The dimension of mass is? Very good, M.

Momentum = ML/T.

End of discussion for this topic, any question?

Don't confuse unit with dimension, I do make the mistake.

Get your game right .

This is just the beginning of physics, the ride will be long and

bumpy, before that, any question, suggestion, query,

opinion, interjection?

Mr Solution

.

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 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.

[b]Motion is defined as the change of position of a body

with time.

Types of Motion .

There are five types of motion, which are; translational

rectilinear motion, random motion, oscillatory motion,

rotational motion and relative motion.

1. Translational rectilinear motion This type of motion

occurs when an object moves in a fixed direction. When

a body moves in a fixed direction, the body is said to be

translated. Examples are; movement of a car from a

point to another, human movement from a point to

another br /> 2. Random motion This is a type of motion in which a

body moves in a non-linear manner and changes

direction continuously. Examples are; molecular

movement in gases, dashing of objects in air eg feather

thrown into air.

3. Oscillatory motion This is a to and fro movement

about a fixed point. It arises due to a slight

displacement of an object from the initial position to a

new position and back to the initial position. Examples

are; simple pendulum, vibration of plucked guitar

strings.

4. Rotational motion This is the movement of a body in

a rotational manner about its axis. Examples are;

rotation of electric fan blades, movement of car wheels.

5. Relative motion Is the movement of object in

relation to another body. A car travelling on a road side

is said to be in motion with respect to the poles and the

trees on the road side. Examples are; pulling on a spinal

spring, bending a ruler on a beam.

Causes of Motion

Force causes motion. When force is applied on any

object, it causes change. Force is a vector quantity

denoted by F and measured in Newton(N).

Types of Force .

There are two types of force, which are the contact

force and force field.

1. Contact force; This exists when there is a touch, hold

or a contact with the object in question. It is further

divided into like force or push, unlike force or pull and

fictional force or viscous.

2. Force field; This exists in or is confined/restricted to a

given region or space, i.e., a region in space where a

body experiences the effect of a force which occurs as a

result of the influence of some physical agencies. It is

further divide into; magnetic force, gravitational force

and electric force.

a. Magnetic force; This is a force that attracts magnetic

substance eg nails.

b. Gravitational force; This is a force that attracts or

pulls objects irrespective of their masses towards the

centre of the Earth's surface.

c. Electric force; This is a force that keeps current

through a conductor of electricity.

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 = w2r, or

a = v(v/r) = v2/r.

Centripetal force.

This is the force required to keep object moving in a

circular path.

Mathematically;

f = ma

f = mvw, or

f = mv2/r, or

f = mw2r.

Where f is force (N)

m is mass (kg)

a is acceleration (m/s2).

Example; An object of mass 4kg moves in a circle at

radius 8m at unformed speed of 32m/s. Calculate; (a)

the angular velocity (b) the centripetal force.

Solution;

m = 4kg

r = 8m

v = 32m/s.

(a) v =wr

w = v/r

w = 32/8

w = 4rad/sec.

(b) f = mw2r.

F = 4 X 4 X 4 X 8

f = 512N.

Mr Solution

.

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 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.

[b]Motion is defined as the change of position of a body

with time.

Types of Motion .

There are five types of motion, which are; translational

rectilinear motion, random motion, oscillatory motion,

rotational motion and relative motion.

1. Translational rectilinear motion This type of motion

occurs when an object moves in a fixed direction. When

a body moves in a fixed direction, the body is said to be

translated. Examples are; movement of a car from a

point to another, human movement from a point to

another br /> 2. Random motion This is a type of motion in which a

body moves in a non-linear manner and changes

direction continuously. Examples are; molecular

movement in gases, dashing of objects in air eg feather

thrown into air.

3. Oscillatory motion This is a to and fro movement

about a fixed point. It arises due to a slight

displacement of an object from the initial position to a

new position and back to the initial position. Examples

are; simple pendulum, vibration of plucked guitar

strings.

4. Rotational motion This is the movement of a body in

a rotational manner about its axis. Examples are;

rotation of electric fan blades, movement of car wheels.

5. Relative motion Is the movement of object in

relation to another body. A car travelling on a road side

is said to be in motion with respect to the poles and the

trees on the road side. Examples are; pulling on a spinal

spring, bending a ruler on a beam.

Causes of Motion

Force causes motion. When force is applied on any

object, it causes change. Force is a vector quantity

denoted by F and measured in Newton(N).

Types of Force .

There are two types of force, which are the contact

force and force field.

1. Contact force; This exists when there is a touch, hold

or a contact with the object in question. It is further

divided into like force or push, unlike force or pull and

fictional force or viscous.

2. Force field; This exists in or is confined/restricted to a

given region or space, i.e., a region in space where a

body experiences the effect of a force which occurs as a

result of the influence of some physical agencies. It is

further divide into; magnetic force, gravitational force

and electric force.

a. Magnetic force; This is a force that attracts magnetic

substance eg nails.

b. Gravitational force; This is a force that attracts or

pulls objects irrespective of their masses towards the

centre of the Earth's surface.

c. Electric force; This is a force that keeps current

through a conductor of electricity.

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 = w2r, or

a = v(v/r) = v2/r.

Centripetal force.

This is the force required to keep object moving in a

circular path.

Mathematically;

f = ma

f = mvw, or

f = mv2/r, or

f = mw2r.

Where f is force (N)

m is mass (kg)

a is acceleration (m/s2).

Example; An object of mass 4kg moves in a circle at

radius 8m at unformed speed of 32m/s. Calculate; (a)

the angular velocity (b) the centripetal force.

Solution;

m = 4kg

r = 8m

v = 32m/s.

(a) v =wr

w = v/r

w = 32/8

w = 4rad/sec.

(b) f = mw2r.

F = 4 X 4 X 4 X 8

f = 512N.

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PHYSICS class

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Originally posted by **Solutionz**

Welcome to Solutionclass Jamb Tutorial Centre for

PHYSICS class

Lecturers in charge - Aliyu Bello

OVER TO YOU NOW

Welcome to Solutionclass Jamb Tutorial Centre for

PHYSICS class

Lecturers in charge - Aliyu Bello

OVER TO YOU NOW

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PHYSICS class

Lecturers in charge - Aliyu Bello

OVER TO YOU NOW

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PHYSICS class

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PHYSICS class

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[/color][/quote] physic practical question nabted 2016/2017[/color]

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Originally posted by **damsel399**

and obj. of mass 6kg move in a circle at rad.8m at uniformed speed of36m/s cal. de angular velocity

. The Answer Is 6 rad/secand obj. of mass 6kg move in a circle at rad.8m at uniformed speed of36m/s cal. de angular velocity

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