PHYSICS

Question 1

two major systems of units used in the world

Answer 1

SI units and English units

Question 2

Also known as
the metric system

Answer 2

SI units

Question 3

Also known as the customary or imperial
system

Answer 3

English units

Question 4

The acronym
“SI” is derived from the

Answer 4

French Système International

Question 5

how close a
measurement is to the correct
value for that measurement.

Answer 5

Accuracy

Question 6

a measurement
system refers to how close the
agreement is between repeated
measurements (which are
repeated under the same
conditions)

Answer 6

precision

Question 7

is a quantitative measure of how
much your measured values deviate
from a standard or expected value.

Answer 7

Uncertainty

Question 8

SI units are part of the metric
system. The metric system is
convenient for scientific and
engineering calculations
because the units are
categorized by factors of 10.

Answer 8

Metric Prefixes

Question 9

The factors contributing to uncertainty in a
measurement include:

Answer 9

● Limitations of the measuring device
● The skill of the person making the
measurement
● Irregularities in the object being measured
● Any other factors that affect the outcome
(highly dependent on the situation).

Question 10

the branch of physics which deals with the cause and effects
of motion of a particle, rigid objects and deformable bodies etc.

Answer 10

Mechanics

Question 11

Mechanics is classified under two streams namely

Answer 11

Kinematics and Dynamics

Question 12

The word Kinematics means
“science of motion”.

Answer 12

Kinematics

Question 13

The branch of mechanics
which is concerned about the
causes (i.e. the force, torque)
that cause of motion of
bodies.

Answer 13

Dynamics

Question 14

Concept of a point object/point
mass/particle

Answer 14

When the size of the object is much less in
comparison to the distance covered by the
object then the object is considered as a
point object.

Question 15

A certain amount of matter limited in all directions
and consequently having a finite size, shape and occupying
some definite space is called a body.

Answer 15

BODY -

Question 16

A body is said to be rigid if the distance between any pair of its constituent particles remains unchanged.

Answer 16

RIGID BODY

Question 17

The smallest part of matter with zero dimension
which can be described by its mass and position is defined as
a particle. Thus, a particle has only a definite position, but no
dimension. In the problems we are going to discuss, we will
consider a body to be a particle for the sake of simplicity.

Answer 17

Particle

Question 18

A body is said to be in
motion if its position changes
continuously w.r.t. the
surroundings (or with
respect to an observer) with
the passage of time.

Answer 18

Motion

Question 19

An object is said to be at rest
if it does not change its
position w.r.t. its
surroundings with the
passage of time.

Answer 19

Rest

Question 20

It is a system to which a set of coordinates are attached and with reference to which observer describes
any event.

Answer 20

Frame of Reference

Question 21

The motion of a moving car, a person
running, a stone being dropped.

Answer 21

LINEAR MOTION

Question 22

The motion of an electric fan, motion of
earth about its own axis.

Answer 22

ROTATIONAL MOTION

Question 23

The motion of a simple pendulum, a body
suspended from a spring (also called to
and fro motion).

Answer 23

OSCILLATORY MOTION

Question 24

The position of a particle refers to its location
in the space at a certain moment of time. It
is concerned with the question – “where is
the particle

Answer 24

Position Vector

Question 25

The change in the position of a moving object
is known as displacement. It is the vector
joining the initial position of the particle to
its final position during an interval of time

Answer 25

Displacement Vector

Question 26

The length of the actual path travelled by a particle during a given time interval is called as distance. The distance travelled
is a scalar quantity which is quite different from displacement. In general, the distance travelled between two
points may not be equal to the magnitude of the displacement between the same points.

Answer 26

Distance

Question 27

may be either positive or zero
but it can not be negative

Answer 27

Distance

Question 28

the length of the path
traveled by a body in any direction.

Answer 28

Distance

Question 29

The between two given points
depends upon the path chosen.

Answer 29

Distance

Question 30

it is always positive.

Answer 30

Distance

Question 31

scalar quantity

Answer 31

Distance

Question 32

will never decrease

Answer 32

Distance

Question 33

the shortest
distance between the initial and the
final positions of a body in the
direction of the point of the final
position.

Answer 33

Displacement

Question 34

two points is
measured by the straight path
between the points.

Answer 34

Displacement

Question 35

may be positive as
well as negative and even zero.

Answer 35

Displacement

Question 36

a vector quantity

Answer 36

Displacement

Question 37

may decrease

Answer 37

Displacement

Question 38

has magnitude and direction

Answer 38

VECTOR FORCE

Question 39

a resultant force acting on object

Answer 39

NET FORCE

Question 40

An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force

Answer 40

NEWTON’S FIRST LAW OF MOTION