Form 4

Question 1

Physical Quantities

Answer 1

quantities that can be measured

Question 2

Base Quantities

Answer 2

are physical quantities that cannot be derived from other physical quantities

Question 3

Derived Quantities

Answer 3

are physical quantities that are derived from 1 or more base quantities

Question 4

Scalar quantities

Answer 4

quantities that only have magnitude

Question 5

Vector quantities

Answer 5

quantities that have both magnitude and direction

Question 6

Distance

Answer 6

Length of route covered by an object

Question 7

Displacement

Answer 7

The shortest direction between the initial position and the final position in a specific direction

Question 8

Speed

Answer 8

Rate of change of distance

Question 9

Velocity

Answer 9

Rate of change of displacement

Question 10

Acceleration

Answer 10

Rate of change of velocity

Question 11

Gravitational acceleration

Answer 11

Acceleration of object due to the pull of the gravitational force

Question 12

Inertia

Answer 12

The tendency of an object to resist changes in motion

Question 13

Newton’s First Law of Motion

Answer 13

States that all object will remain at least or move at an uniform velocity unless acted upon external force

Question 14

Momentum

Answer 14

The product of mass and velocity

Question 15

Force

Answer 15

Push or pull exerted on an object to change its momentum

Question 16

Impulsive force

Answer 16

Rate of change of momentum in collision in a short period of time

Question 17

Impulse

Answer 17

Change of momentum

Question 18

Newton’s Second Law of Motion

Answer 18

F=ma

States that rate of change of momentum is directly proportional to the force and acts in the direction of applied force

Question 19

Newton’s Third Law of Motion

Answer 19

States that every action there is a reaction of ewual magnitude, but in the opposite direction

Question 20

Weight

Answer 20

Gravitation force acting on an object

Question 21

Gravitational field strentgh

Answer 21

Gravitational force acting on a mass of 1kg

Question 22

Gravitational force

Answer 22

Force that acts on any two bodies in the universe

Question 23

Newton’s Universal Law of Gravitiation

Answer 23

States that the gravitational force between 2 bodies is directly proportional to the products of masses of the two bodies and inversely proportional to the square of distance between the centre of two bodies

Question 24

Centripetal force

Answer 24

For a body in a circular motion, centripetal force is a the force acting on an object in the direction towards the centre of the circle

Question 25

Kepler First Law

Answer 25

Law of Orbits | -states that all planet move in elliptical orbits with the Sun at one focus

Question 26

Keplers second law

Answer 26

Law of Areas | A line connecting a planet and Sun sweeps out equal area at equal time

Question 27

Keplers Third Law

Answer 27

Law of Period T2 = R3 The square of orbital period of an planet is directly proportional to the cube of radius of it's orbit

Question 28

Escape velocity

Answer 28

The minimum velocity required by an object on the surface of the earth to overcome the gravitational force and escape to outer space.

Question 29

Thermal equilibrium

Answer 29

The state in which the net rate of heat transfer of two object is zero and the temperature of both object is equal

Question 30

Heat capacity

Answer 30

Thr quantity of heat needed to raise the temperature of an objecf by 1°C

Question 31

Specific heat capacity

Answer 31

The quantitiy of heat needed to raise the temperature of 1kg od substance by 1°C

Question 32

Latent heat

Answer 32

The total energy absorbed or released when a substance completely changes its physical state at a constant temperature

Question 33

Specific latent heat

Answer 33

The quanitity of heat needed to change 1kg od object physically without any changes in it's temporarature

Question 34

Specific latent heat of fusion

Answer 34

The quantity of heat absorbed during evaporation or the quantity of heag released during freezing of 1kg of substance without any changes in it's temperature

Question 35

Specific latent heat of vapourisatoon

Answer 35

The quantity of heat absorbed during boiling or the quantity of heag released during condensation of 1kg of substance without any changes in it's temperature

Question 36

Boyles Law

Answer 36

PV = PV | states that the pressure is inversely proportional to the volume for a fixed mass of gas at a constabce temperature

Question 37

Charles Law

Answer 37

V/T = V/T | The volume is directly proportional to the absolute temperature for a fized mass of gas at constant pressure

Question 38

Gay-Lussacs Law

Answer 38

P/T = P/T | the pressure is directly proportional to the absolute temperature for a fixed mass of gas at constant volume