ESAS

Question 1

are quantities whose measurement is specified by magnitude and
direction. The following are examples of vector quantities: Weight, momentum,
torque, velocity, displacement, acceleration, electric field intensity, etc.

Answer 1

Vector quantities

Question 2

are those quantities which have only magnitude. The following are
examples of scalar quantities: Speed, mass, volume, energy, length,
temperature, etc.

Answer 2

Scalar quantities

Question 3

is the line whose length indicates to scale the magnitude of the vector quantity
and whose direction indicates the direction of the quantity. The term “vector”
comes from Latin “vehere” which means “to carry”.

Answer 3

Vector

Question 4

“There is no change in the motion of a body unless an unbalanced external force is
acting upon it.”

Answer 4

Newton’s First Law: (The law of inertia)

Question 5

“Whenever a net (resultant) force acts on a body, it produces an acceleration in the
direction of the resultant force that is directly proportional to the resultant force and
inversely proportional to the mass of the body.”
F =ma

Answer 5

Newton’s Second Law: (The law of acceleration)

Question 6

“For every force that acts on one body there is a second force equal in magnitude but
opposite in direction that acts upon another body.”

Answer 6

Newton’s Third Law: (The law of reaction)

Question 7

s the property of the body by virtue of which a resultant force is required to
change its motion.

Answer 7

Inertia

Question 8

is the resultant gravitational force acting on the body due to all
other bodies in space. It is always a vertical force acting downward.

Answer 8

Weight(of a body)

Question 9

is the force that will give to a mass of one kilogram an acceleration of one
meter per second per second

Answer 9

Newton

Question 10

is the force that will give to a mass of one gram an acceleration of one
centimeter per second per second.

Answer 10

Dyne

Question 11

is the force that will give to a mass of one pound an acceleration of one foot
per second per second

Answer 11

Poundal

Question 12

is the mass to which a force of one pound will give an acceleration of one foot
per second per second.

Answer 12

Slug

Question 13

is one-thousandth the pull of the earth upon a standard kilogram at a
place where g has a value of 980.665 cm/s2.

Answer 13

Gram force

Question 14

is the product of force and the displacement in the direction of the force.
Force× distance

Answer 14

Work

Question 15

is the property of the body or system of bodies by virtue of which work can be
done. It is also defined as the ability to do work. A scalar quantity.

Answer 15

Energy

Question 16

is also known as the energy of position or configuration.

P E = Wh −mgh

Answer 16

Potential Energy

Question 17

is the energy in motion.

Answer 17

Kinetic Energy

Question 18

a force acting on the body whenever it moves while in contact with
another body. This force always opposes the direction of the motion. The frictional force
is proportional to the normal force and is directed parallel to the surface.

Answer 18

Frictional Force

Question 19

is the ratio of the frictional force to the perpendicular
force pressing the two surfaces together

μK =F/N

Answer 19

Coefficient of kinetic friction

Question 20

is the ratio of the limiting frictional force to the normal

force.

Answer 20

Coefficient of static friction

Question 21

“Energy can neither be created nor destroyed; it merely changes from one
form to another

Answer 21

Law of Conservation of Energy:

Question 22

is the time rate of doing work.

Answer 22

Power

Question 23

is a stress caused by forces acting along or

parallel to the area resisting the forces.

Answer 23

Shearing stress (or tangential stress)

Question 24

is one which is caused by forces acting perpendicular to the area
resisting the forces. Normal stresses, like tensile stress and compressive stress are
examples of bearing stress.

Answer 24

Bearing stress