[Physics] Basics

Question 1

System of units of MKS (m, kg, s) and CGS (cm, g, s)

Answer 1

SI System

Question 2

Also known as the metric system; system of units used by scientists and engineers around the worlds

Answer 2

International System (SI)

Question 3

Used to denote very large or very small number by powers of 10 ( a x 10 raised to b)

Answer 3

Scientific Notation

Question 4

• Physical quantity having a magnitude only

- distance, time, temperature

Answer 4

Scalar Quantity

Question 5

• Physical quantity having both magnitude and direction

- displacement, velocity, acceleration

Answer 5

Vector Quantity

Question 6

motion with non-zero acceleration

Answer 6

Uniformly Accelerated Rectilinear Motion (UARM)

Question 7

motion of a falling body under the influence of the Earth’s gravity

Answer 7

Free Fall Motion

Question 8

the constant acceleration of a free falling body

Answer 8

Acceleration due to gravity

Question 9

the ability to do work

Answer 9

Energy

Question 10

energy possessed by a moving body

Answer 10

Kinetic Energy

Question 11

the energy of a body due to its position or shape

Answer 11

Potential Energy

Question 12

the energy of an object due to its vertical separation from the Earth’s surface

Answer 12

Gravitational Potential Energy

Question 13

the energy in a stretched or compressed spring

Answer 13

Elastic Potential Energy

Question 14

the energy of electrons inside an atom

Answer 14

Electric Potential Energy

Question 15

• random kinetic energy of atoms and molecules

- chemical energy due to bonds and interactions between atoms and molecules

Answer 15

Internal Energy

Question 16

change in position of a body

Answer 16

Motion

Question 17

length covered by a body due to its motion

Answer 17

distance

Question 18

distance with direction

Answer 18

displacement

Question 19

distance travelled ver time (m/s)

Answer 19

speed

Question 20

vector quantity which is the ratio of displacement over time

Answer 20

velocity

Question 21

the rate of change in velocity with respect to time

Answer 21

acceleration

Question 22

motion of a body thrown horizontally and affected by Earth’s gravitational pull

Answer 22

Projectile motion

Question 23

path taken by an object in projectile motion

Answer 23

Trajectory

Question 24

Bodies at rest will remain at rest and bodies in motion will continue moving at constant speed in a straight line unless acted upon by a net force

Answer 24

Law of Inertia

Question 25

An unbalanced force acting on an object will cause the object to accelerate in the direction of the force

Answer 25

Law of Acceleration

Question 26

For every action, there is an equal but opposite reaction

Answer 26

Law of Interaction

Question 27

Property of matter that enables it to return to its original size and shape when the applied external force is removed

Answer 27

Elasticity

Question 28

A component of force perpendicular to the area it acts on

Answer 28

Stress

Question 29

A measure of deformation, usually it is the object’s change in length

Answer 29

Strain

Question 30

Strain is directly proportional to the cause of deformation (stress)

Answer 30

Hooke’s Law

Question 31

Tendency of a moving object to continue moving and the difficulty encountered in reducing that motion

Answer 31

Momentum

Question 32

Kepler’s First Law of Planetary Motion

Answer 32

The orbit of a planet is an ellipse with the Sun at one of the two foci

Question 33

Kepler’s Second Law of Planetary Motion

Answer 33

A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time

Question 34

Kepler’s Third Law of Planetary Motion

Answer 34

The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit