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acceleration	The rate of change of velocity
STANDARD METER	The distance between two engraved marks at the ends of a rod made of platinum and Iridium alloy kept at 0°C.
DERIVED physical quantity	A physical quantity that can be defined in terms of the fundamental physical quantities.
the fundamental physical quantities.	A physical quantity that cannot be defined in terms of other physical quantities
STANDARD KILOGRAM	The mass of a cylinder made of platinum and Iridium alloy of specific dimensions at the International Bureau of Weights and Measures
MEASURAMENT PROCWSS	Comparing a physical quantity with another quantity of its kind to find out how many times the first includes the second.
THE SECOND	A part of 86400 of the average solar day
DISPLACEMENT	The straight line segment in a certain direction between a starting point and end point
VECTOR QUANTITY	A physical quantity that can be fully defined by its magnitude and direction
SCALAR QUANTUTY	A physical quantity that can be fully defined by its magnitude only
THE RESULTANT FORCE	A single force produces the same effect on an object as that produced by a number of forces acting on it.
TRANSLATION MOTION	A type of motion which is characterized by having a starting point and end point
PERIODIC MOTION	The motion that repeats itself over equal intervals of time
AVERAGE VELOCITY	The quotient of total displacement and total time.
UNIFORM VELOCITY	The object velocity when it is displaced through equal displacements in equal times.
INSTANTANEOUS VELOCITY	The velocity of the object at a given instant.
MOTION	The change in the object position as the time passes
VELOCITY	The displacement of the object in one second.
THE ACCELERATION	The change of the object velocity per unit time.
THE ACCELERATION DUE TO GRAVITY	The uniform acceleration by which objects move during free fall.
DISPLACEMENT	Numerically equal to the area below the curve in velocity-time graph.
UNIFORM ACCELERATION	A type of acceleration when the rate of change of velocity is constant.
FREE FALL	The fall of objects under the effect of their weight only.
Newton’s FIRST law OF MOTION	Newton’s law that states that: A static object keeps its state of rest, and a moving object keeps its state of motion at uniform velocity in a straight line unless acted upon by a resultant force.
THE FORCE	An external influence that affects the object to change its state or direction of motion.
Newton’s THIRD law OF MOTION	Newton’s law that states that: For every action there is a reaction equal in magnitude and opposite in direction
SPRING SCALE	The tool used to measure force.
INERTIA	Resistance of object to change its kinematics state.
INERTIA	Tendency of an object to keep either its state of rest or state of motion at its original velocity uniformly in a straight line.
WEIGHT	The force of gravity acting on the body.
CIRCULAR MOTION	The motion of a body in a circular path at a constant speed but of changeable direction.
PERIODIC TIME	The time taken by the body to cover the circumference of a circle.
THE CENTRPETAL FORCE	The force that continuously acts normally to the motion of a body, changing its straight path into circular.
THE CENTRPETAL ACCELARATION	The acceleration acquired by a body in circular motion due to a change in the direction of velocity.
Gravitational Field	The area where the forces of gravitation take place.
The intensity of Earth's gravitational field	The gravitational force of the Earth on a body of mass 1kg
Newton's general gravitational law	The law that states: A materialistic body attracts another by a force that is directly proportional to the product of Their masses and inversely proportional to square the distance between them.
The Joule	The work done by a force of one Newton to move an object through a displacement of one meter in the direction of the force
KINETIC ENERGY	The energy possessed by an object due to its motion
MECHANICAL ENERGY	The energy that equals the sum of the kinetic energy and the potential energy of an object
POTENTIAL ENERGY	The energy stored in an object due to its position
ENERGY	The capacity to do work.
THE CONSERVATION LAW OF ENERGY	Name of the law that states: Energy is neither created nor destroyed but it is converted from one form into another

The heat capacity of a body	the quantity of heat energy needed to raise the temperature of the body by one Kelvin.
MECHANICAL ENERGY	The energy that equals the sum of object kinetic energy and the potential energy
HEAT ENERGY	The energy that flows spontaneously from the hot body to the cooler body
Fahrenheit Scale	A scale of temperature in which the freezing point of water = 32 degree
THERMOMETER	A tool to measure temperature
TEMPERATURE	A measure for the average kinetic energy of molecules.
INTERNAL ENERGY	Sum of the kinetic energy and the potential energy of the substance molecules
JAMES JOULE	A scientist who measured the mechanical equivalent of heat
Specific heat capacity of a substance	The quantity of heat needed to raise the temperature of the whole body by one Kelvin
Latent heat of fusion of a substance	The quantity of heat needed to convert 1 kg of the substance from the solid state into the liquid state without a change in its temperature.
Freon	A liquid of low boiling point used in cooling systems
compressor	Pipes at the fridge back to get rid of heat
Latent heat of vaporization of a substance	The quantity of heat needed to convert 1 kg of the substance from the liquid state into the vapour state without a change in its temperature.

The work is scalar quantity	Because it's the result of the dot product of the force and displacement
We can not add or subtract work and force	Because they have different units ( joules and Newton (
Mass is fundamental, scalar physical quantity.	Because it can not be derived from other quantities, and it is completely described by knowing its magnitude only.
No measurement can be done with 100% accuracy.	Because of errors: 1- error due to 2- error due to environment as temp. Humidity. 3- Human error in reading
Area, velocity, pressure and density are considered derivable. Physical quantities, not fundamental ones.	Because they are derived from more than one fundamental quantity.
The acceleration of a body moves with uniform velocity in st.line equals zero.	Because the acceleration = vf - vi / t , and since the velocity is uniform so = vf - vi = 0 , and a = zero.
Although a body moving in a uniform circular motion is affected by a centripetal force towards the center, it never gets closer to the center of the circle.	Because the centripetal force acts towards the center of the circle in the normal direction to the displacement
At curves, the motorbike rider tilts his bike and body towards the center of the circular path.	To generate a force normal to the direction of motion. Thus, the direction of motion is changed and the racer moves in a circular path.
When a car moves in a road curve, it maintains its curved path and doesn’t skid	Because the centripetal force acting on the car is normal to the direction of the displacement which maintains its curved path
It is dangerous to move at high velocities in curves of roads.	Because the centripetal force is directly proportional to the square of velocity
Potential energy of water is greater at the top of waterfall than that at the bottom.	Because the P.E is directly proportional to the height
Gaps are left when designing bridges and railways.	Because metals contract by cooling and expand by heating
Velocity is a derived quantity.	Because it's derived from basic physical quantities v = d / t
An object may have acceleration although it moves at constant speed.	Because the velocity may change direction as in circular motion
Potential energy of water is greater at the top of waterfall than that at the bottom.	Because the P.E is directly proportional to the height
Drivers should slow down speed in curved road.	Because the centripetal force is directly proportional to the square of the speed
When two bodies of equal shape and volume but different in mass, are dropped from high, they hit the ground at the same instant.	Because the two bodies traveled the same distance with the same gravitational acceleration due to a gravity and starting from rest, so they have the same final velocity and take the same time to reach the ground.
) A free falling body is a typical example for a motion with uniform acceleration (neglecting the air resistance )	Because at any instant , the rate of change in velocity (Δv/ Δt ) is constant, and equals the acceleration due to gravity "g".
The (displacement - time) graph of a body moves with uniform velocity is a straight line.	Because at any instant, the rate of change in displacement ( Δ d / Δ t ) is constant and equal the slope of the graph line.
The motion of "Moon" is a "periodic motion".	Because this moon repeats its motion a round earth at equal time intervals.
Displacement" is a vector, while "Distance" is a scalr physical quantity	Because "Displacement" is described by its magnitude and direction, but "Distance" is totally described by its magnitude only.
The acceleration of a moving body can be positive or negative.	Because some bodies move in a way such that their final velocities is larger than their initial ones, so they have a positive acceleration others have final velocity smaller than the initial one, they move with a negative acceleration, this can be cleared from : a = vf - vi / t
A vertically projected body from the surface of earth returns back to earth with the same velocity if the air resistance is negligible.
The passengers of a bus tend to fall forwards when the bus suddenly stops	Because the passengers try to mentian there state of motion by inertia.
Two or more forces may act on a body without changing its state of motion.	Because the effect of one force is canceled by the other one, giving a resultant force equals to zero.
Newtons first law can be called "the law of inertia.	Because the inertia is the most important result taken from this law.
It is easier to stop a moving body than stopping a more massive body moves with the same velocity.	Because the smaller body has a smaller inertia, so it can be stoped easly, while the massive one has a larger inertial, so it can resists more stopping it.
The weight of a body has a greater magnitude than its mass.	Because when calculating the weight, the mass is multiplied by 'g".
The weight is measured in Newton.	Because weight is the force of gravity acting on the bdoy = mg in Newton
Acceleration due to gravity varies from one planet to another.	Because it depends on the mass of the planet and its radius ,
The centripetal force acting on a body rotaitng in a circular orbit does no work.	Because the direction of motion is always perpendicular to the direction of force
Increaseing the height of a body increases its P.E.	because P.E = m g d.
The potential energy of a dropping body decreases while its kinetic energy increases	Because as the body drops, some of its P.E changes to K.E.
As the velocity of a moving body increases its K.E. increases.
Escape velocity of the satellite does not depend on the mass of the body.	Because
Satellites are considered as free falling bodies.	Because they move in a circular bath under graivtational force of Erath but never reaching its surface.
Water is not used in liquid thermometers.	Because of its irregular expansion with heat
The temperature is not changed on melting.	because the gained energy is used to break bonds between molecules so, kinetic energy and temperature are kept constant
The heat absorbed to change water at 100 o c to vapour increases as the mass of water increases	because the heat needed to evaporate water at 100 o c is directly proportional to the mass of water used.
The heat capacity of a body can't be taken as a physical property for a certain material.	Because it depnds on the mass of the body.
The temeprature of water is not raised by the same degrees as sand beach at noon, though both are exposed to sun for the same period time.	Because the S.H.C. of water is much greater than that of sand beach.
Living creatures can resist the change in temeprature of the surrounding environment	Because living creatures contain a large water content in their bodies, which makes their heat capacity large enough to resist the temeperature changes.

The direction of force is in the same direction of motion.	The magnitude of velocity increases & its direction does not change
The direction of force is in the opposite direction of motion.	The magnitude of velocity decreases & its direction does not change
The direction of force is normal to direction of motion.	The direction of velocity changes and its magnitude does not change
The centripetal force acting on a body is removed	the body will move at uniform velocity in straight line in the direction of the tangency
The satellite stops and its velocity becomes zero:	It would fall in a straight line towards the earth and fall onto it.
The gravitational force between the earth and the satellite vanishes:	The satellite moves in a straight line along the tangent to the circular path, and move getting away from the Earth.

The slope of line in the graph between square of speed on y-axis and reciprocal of mass on x-axis equals 10 J.	This mean that the kinetic energy is 5 j
A body moves at acceleration of (3 m/s2)	The velocity of the object increases by 3 m/s every second.
Specific heat of water is 4200 J/kg. K?	the quantity of heat needed to raise the temperature of 1 kg of the water by one Kelvin. Is 4200 J
An object has potential energy of 200 J?	The stored energy in the object due its position is 200 J
Free fall acceleration is 9.8 m/s2?	The velocity of the object that falls freely increases by 9.8 m/s every second.
Latent heat of fusion of ice is 3.3 x 105 J/kg?	The quantity of heat needed to convert 1 kg of ice from the solid state into the liquid state without a change in its temperature is 3.3 × 105 J

Drying clothes.	Skidding of objects away from the circular path when the centripetal force is too weak to keep them in the path
The electric resistance thermometer.	The electric resistance of a resistor changes regularly in platinum thermometer with temperature
Thermometers?	based on selecting a substance with a physical property that changes regularly with the change of temperature
The refrigerator?	Liquids absorb heat energy when converted into vapor; on the other hand heat is released when vapor is converted into liquid
Mercury thermometer?	liquid length changes with temperature in liquid thermometer.

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term ccelertion The rte of chnge of velocity STNDRD METER

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