Module 6

Question 1

It is a product between two variables which, when sketched against a coordinate plane, their vector arrows are set against each other, tail to tail.

Answer 1

dot product

Question 2

Applying a force over a certain distance is the simplest definition of ___.

Answer 2

work

Question 3

It is an action of a force, moving in a certain direction, to an object. Meaning, it is achieved if the object is moving alongside the direction the force is directed at, or the object is moving at a component of the force’s direction.

Answer 3

Mechanical work

Question 4

work is not applicable if:

Answer 4

1. the object is not moving; and
2. the force being applied on the object is perpendicular to the object’s motion

Question 5

What are the conditions in order to do work?

Answer 5

1. the force and the direction of the resulting, or existing, motion is the same; or
2. a component direction of a force acting on the object is moving in the same direction as the object’s

Question 6

The unit of work, which is a dot product derived value, is (1)___. But, it is often shortened to (2)___, in honor of the English physicist (3)___, and to avoid confusion with another concept in Mechanics.

Answer 6

(1) Newton – meters (Nm), (2) Joule (J), (3) James Prescott Joule

Question 7

It is the computed amount of work done within a certain time.

Answer 7

Power

Question 8

Power’s derived unit is the (1)___, named after the mechanical engineer (2)___.

Answer 8

(1) Watt (𝑊𝑊), (2) James Watt

Question 9

What is the other unit for power which is equivalent to 746 watts?

Answer 9

horsepower (ℎ𝑝) or imperial horsepower

Question 10

It is best defined as the property that objects need to transfer in order to perform work. Since there is transfer involved, it can neither be created nor destroyed. It can only change forms, which allows a body to perform work on another body.

Answer 10

Energy

Question 11

Its unit is also ___. But it can also be watt-second, watt-hour, horsepower-second, horsepower-hour, and so on.

Answer 11

joule

Question 12

What are two basic forms of energy?

Answer 12

kinetic and potential

Question 13

It is the energy translated in motion (i.e. it is the energy observed in motion). It is also best explained
as the energy an object possesses because it is moving.

Answer 13

Kinetic energy

Question 14

It is the energy observed from rest, either from its position to other objects, stresses within itself, and many more.

Answer 14

Potential energy

Question 15

It is the potential energy stored due to a change in height.

Answer 15

Gravitational potential energy (abbreviated as 𝑈𝑔𝑔)

Question 16

The ___ the object, the ___ its potential energy.

Answer 16

higher, higher

Question 17

It is the potential energy stored by an object as it gets pulled apart or compressed.

Answer 17

elastic potential energy

Question 18

Elastic 𝑃𝐸 exists under two forms:

Answer 18

elastic and spring

Question 19

It is the energy stored due to the object being compressed from its ends.

Answer 19

Spring potential energy

Question 20

It is a unique value wherein it depends on the material’s elasticity.

Answer 20

spring constant

Question 21

Law of Conservation of Energy

Answer 21

Energy is a concept that is neither created nor destroyed. It only transfers, and changes form, from one body to another.

Question 22

The Law of Conservation of Energy is one of the fundamental conservation laws in Physics that explains that the total energy of the system is ___.

Answer 22

constant

Question 23

What are two classifications of force?

Answer 23

conservative and non-conservative

Question 24

It is a force whose work done between two given points is independent from the path taken by the work itself. It also implies that if potential energy can be associated to a force, that force is ___

Answer 24

conservative force

Question 25

If a force, however, follows the path the work has associate itself with potential energy, the force then is ___.

Answer 25

non-conservative

Question 26

It is a principle wherein there must be a balance between work and energy within the system, or body.

Answer 26

work-energy principle