Math Terms, Ch 4-7

Question 1

Coplanar Vectors

Answer 1

Vectors in the same plane

Question 2

Concurrent vectors

Answer 2

Vectors that pass through the same point or meet at one point

Question 3

What is the definition of force(N)?

Answer 3

Any action on a body that tends to change the body’s state of rest or state of motion

Question 4

Weight Definition:

Answer 4

Known as the force due to gravity, it is the downward force that is applied by every mass

Question 4

Friction Angle definition:

Answer 4

When the reaction force is acting at an angle between the object and the surface which can be broken down into its components

Question 5

u=Ff/Rn Coefficient of friction definition:

Answer 5

The ratio of the force required to move a body to the normal(perpendicular) reaction force between the body and the surface which it rests

Question 6

(FxD)Work Definition:

Answer 6

When a force is applied to a body over a distance, causing the body to move through that distance. Work can only be done if displacement of the body occurs

Question 6

Hooke’s Law Definition(Springs):

Answer 6

The force needed to extend or compress a spring by some distance is proportional to that distance

Question 7

Power Definition:

Answer 7

The amount of work done during a unit in time(rate of doing work)

Question 8

Things to remember for pulley’s, if the effort is pulling__________

Answer 8

Downwards toward the load it is NOT included, If the effort is pulling upwards away from the load it IS included

Question 9

Specific Gravity definition:

Answer 9

Ratio of the specific weight of a substance to a specific weight of an equal volume of water

Question 10

The difference between a Double start and single start Screw Jack is?

Answer 10

2 start doubles the load lifted. (divide the pitch by 2)

Question 10

(Screw jack) Lead and Pitch mean?

Answer 10

Lead: Is the axial distance the screw
moves when the handle completes ONE full
revolution.
Pitch: Is considered as the distance
between one thread to the next thread.

Question 11

The handle is moved one ________ to lift
the load by the amount of the pitch.

Answer 11

Circumference. 𝑉𝑅 = 2𝜋𝐿
𝑃

Question 12

Fluid Pressure formula:

Answer 12

𝑃𝑟𝑒𝑠𝑠𝑢𝑟𝑒 = ℎ 𝜌 𝑔
p: density(kg/m3)
h: height(m)
g: gravity(N/kg)

Question 13

Gauge Pressure:

Answer 13

Seen in a pressure gauge where it is
relative to atmospheric pressure. 0 reading is atmospheric

Question 14

Atmospheric Pressure:

Answer 14

Positive pressure due to the
atmosphere above Earth.

Question 15

Absolute Pressure:

Answer 15

Pressure that is relative to the zero
pressure in space. 0 reading means vacuum

Question 16

Volume flow:

Answer 16

Volume of a fluid that passing through any point in the pipe in one second.

Question 17

Continuity of Flow:

Answer 17

If there is no fluid added or removed, the flow of the pipe is the same at any point.

Question 18

Mass Flow:

Answer 18

The rate at which mass of a substance changes in a single point of the pipeline over time.

Question 19

Relative Density:

Answer 19

Ratio of density of a substance to the density of water. Density of water is 1000 kg/m3.

Question 20

Class I Levers:

Class II Levers:

Class III Levers:

Answer 20

1: Fulcrum is located
between the load and effort.
2: Load is placed between
fulcrum and effort.
3: Effort is placed between
fulcrum and load.
Remember: FLE

Question 21

Stress:

Answer 21

The internal resistive or restoring force per unit area that the object exerts when subjected to an external deforming force.

Question 22

Strain:

Answer 22

The deformation or the change within the material under stress.