Lesson 1

Question 1

is the study of forces that act on bodies and the resultant motion that those bodies experience.

Answer 1

Mechanics

Question 2

is the basis of all the mechanical sciences: civil engineering, materials science and engineering, mechanical engineering, aeronautical and aerospace and engineering.

Answer 2

Engineering Mechanics

Question 3

2 Branches of Engineering Mechanics

Answer 3

• Statics
• Dynamics

Question 4

is the branch of mechanics that is concerned with analysis of loads acting on physical systems that do not experience acceleration, but rather, are in static equilibrium with their environment.

Answer 4

Statics

Question 5

branch of physical science and subdivision of mechanics that is concerned with the motion of
material objects in relation to the physical factors that affect them: force, mass, momentum, energy.

Answer 5

Dynamics

Question 6

Dynamics has two distinct parts:

Answer 6

• kinematics
• kinetics

Question 7

which is the study of motion without reference to the forces which cause motion

Answer 7

kinematics

Question 8

which relates the action of forces on bodies to their resulting motions.

Answer 8

kinetics

Question 9

The beginning of a rational understanding of dynamics is credited to __________________, who made
careful observations concerning bodies in free fall, motion on an inclined plane and motion of the pendulum.

Answer 9

Galileo (1564-1642)

Question 10

He was largely responsible for bringing a scientific approach to the investigation of physical problems.

Answer 10

Galileo (1564-1642)

Question 11

Perhaps Galileo’s greatest contribution to physics was his formulation of the concept of ________

Answer 11

inertia

Question 12

an object in a state of motion possesses an “_____________” that causes it to remain in that state of motion unless an external force acts on it.

Answer 12

inertia

Question 13

guided by Galileo’s work, he was able to make an accurate formulation of the laws of motion and, thus, to place dynamics on a sound basis.

Answer 13

Isaac Newton (1642-1727)

Question 14

A body at rest will remain at rest and a body in motion will remain in motion (in a straight line with a constant speed) unless it is acted upon by an external (unbalanced) force.

Answer 14

NEWTON’S FIRST LAW OF MOTION (inertia)

Question 15

The acceleration of an object is directly proportional to the net force and inversely proportional to its mass

Answer 15

NEWTON’S SECOND LAW OF MOTION (acceleration)

Question 16

forms the basis for most of the analysis in dynamics. For a particle of mass m subjected to a resultant force F.

Answer 16

Newton’s second law

Question 17

it states that for every action, there is an equal and opposite reaction

Answer 17

NEWTON’S THIRD LAW OF MOTION

Question 18

It is the location of the particle with respect to the chosen reference point.

Answer 18

POSITION

Question 19

Represents the continual change in an object position.

Answer 19

MOTION

Question 20

is a scalar quantity that refers to “how much ground an object has covered” during its motion.

Answer 20

DISTANCE

Question 21

is defined as the change in position of an object.

Answer 21

DISPLACEMENT

Question 22

It is a vector quantity and has a direction and magnitude.

Answer 22

DISPLACEMENT

Question 23

It is represented as an arrow that points from the starting position to the final position.

Answer 23

DISPLACEMENT

Question 24

Tells the rate of change of motion of an object. It doesn’t care about the direction. (Scalar quantity)

Answer 24

SPEED

Question 25

Tells the rate of change of motion of an object. It ascertains the object’s speed and the direction it takes while moving. (Vector quantity)

Answer 25

VELOCITY

Question 26

The quantity that tells us how fast an object is moving anywhere along its path

Answer 26

INSTANTANEOUS VELOCITY

Question 27

usually simply called velocity

Answer 27

INSTANTANEOUS VELOCITY

Question 28

It is the average velocity between two points on the path in the limit that the time (and therefore the displacement) between the two points approaches zero.

Answer 28

INSTANTANEOUS VELOCITY

Question 29

is the limit of the average velocity as the elapsed time approaches zero, or the derivative of x with respect to t

Answer 29

INSTANTANEOUS VELOCITY

Question 30

is the average rate of change of position (or displacement) with respect to time over an interval.

Answer 30

AVERAGE VELOCITY

Question 31

Tells how fast the velocity changes under a period.

Answer 31

ACCELERATION

Question 32

It is the rate of change of the velocity of an object with respect to time. It is a vector quantity

Answer 32

ACCELERATION

Question 33

An object is said to be in a ________________ when the object moves in a straight line.

Answer 33

Linear Motion

Question 34

There are two types of linear motion, and they are __________ and ___________

Answer 34

uniform motion and non-uniform motion.

Question 35

An example of this motion is: Athlete running 200m along the straight track.

Answer 35

Linear Motion

Question 36

An object is said to be in a _______________ when two objects are moving in a straight line and are parallel to each other.

Answer 36

rectilinear motion

Question 37

An example of this motion is: Elevator movement

Answer 37

Rectilinear Motion

Question 38

is another name for straight-line motion.

Answer 38

Rectilinear motion

Question 39

This type of motion describes the movement of a particle or a body.

Answer 39

Rectilinear motion

Question 40

A body is said to experience _________________ if any two particles of the body travel the same distance along two parallel straight lines

Answer 40

rectilinear motion

Question 41

When an object travels at a constant speed with zero acceleration it is known as _____________

Answer 41

Uniform rectilinear motion

Question 42

When an object travels at an irregular speed and acceleration it is known as __________________

Answer 42

Uniformly accelerated rectilinear motion/rectilinear movement with non-uniform acceleration.