dnt

Question 1

what is engineering?

Answer 1

the branch of science and technology concerned with the design, building, and use of engines, machines, and structures.

Question 2

5 types of engineering?

Answer 2

civil, mechanical, electrical, chemical, and industrial engineering

Question 3

what does civil engineering do?

Answer 3

design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, airports, sewage systems, pipelines, structural components of buildings, and railways.

Question 4

what does mechanical engineering do?

Answer 4

esign and maintain of a wide variety of machines. These could include power generation and transport systems, renewable energy and environmental systems,

Question 5

what does electrical engineering do?

Answer 5

create ways to power the world by designing, creating, developing and managing systems in areas such as computer systems, electronics, telecommunications

Question 6

what does chemical engineering do?

Answer 6

uses principles of chemistry, physics, mathematics, biology, and economics to efficiently use, produce, design, transport and transform energy and materials.

Question 7

what does industrial engineering do?

Answer 7

uring out how to do things better. It combines the physical and social sciences together with engineering principles to improve processes and systems.

Question 8

what is a force?

Answer 8

A force is a push or pull upon an object resulting from the object’s interaction with another object

Question 9

what is a contact force?

Answer 9

Contact force is a force that is applied by objects in contact with each other

Question 10

what is a non contact force?

Answer 10

A non-contact force is a force which acts on an object without coming physically in contact with it. The most familiar non-contact force is gravity, which confers weight.

Question 11

example of a contact force?

Answer 11

Pushing a car up the hill

Question 12

how does gravity work?

Answer 12

The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases. pulls things back down to the ground

Question 13

what is motion?

Answer 13

the change of position of an object with respect to time. A book falling off a table,

Question 14

what are the four types of motion?

Answer 14

rotary, linear, reciprocating, oscillatory

Question 15

what is rotary motion with an example?

Answer 15

The rotary motion includes the physical motion of a certain object which is spinning on an axis of its own. for instance The motion of the wheel,

Question 16

what is linear motion with an example?

Answer 16

this motion is a one dimensional motion that takes place in a straight line. For example, a train running on a track.

Question 17

what is reciprocating motion with an example?

Answer 17

a repetitive up-and-down or back-and-forth linear motion., sewing machine, needle goes up and down

Question 18

what is oscillatory motion with an example?

Answer 18

like a clock chiming, A curved backwards and
forwards motion from an
axis point. Examples of oscillatory motion are vibrating strings, swinging of the swing

Question 19

what is the difference between between kinetic and potential energy?

Answer 19

Potential energy is energy stored in an object due to its position or arrangement. Kinetic energy is energy of an object due to its movement - its motion.

Question 20

three examples of potential energy?

Answer 20

chemical potential, nuclear potential, gravitational potential

Question 21

three examples of kinetic energy?

Answer 21

sound, light, heat

Question 22

Explain a scenario where potential
energy is tranferred into kinestic energy

Answer 22

If released, as the ball moves faster and faster toward the ground, the force of gravity will transfer the potential energy to kinetic energy.

Question 23

what are the 6 simple machines?

Answer 23

inclined plane, lever, wedge, wheel and axle, pulley, and screw.

Question 24

what is an inclined plane?

Answer 24

Flat, slanted surface that allows you to move objects up or down with less effort

Question 25

what is a lever?

Answer 25

A rigid bar that can rotate around a fixed point called a fulcrum. It allows you to lift heavy objects with less force

Question 26

what is a wedge?

Answer 26

Triangular shaped tool that has a thick end and a thin end. It is used to split, cut or lift objects

Question 27

what is a wheel and axle?

Answer 27

Consists of a wheel (circular object) that rotates around an axle (a centre point). It amplifies force, making it easier to move heavy objects.

Question 28

what is a pulley?

Answer 28

Consists of a wheel with a groove that a rope or belt fits into. It is used to lift objects vertically, distributing weight over multiple ropes

Question 29

what is a screw?

Answer 29

An inclined plane wrapped around a cylinder. It is used to hold things together

Question 30

compare the similarities and differences between the Shell fish hooks indigenous people used and now.

Answer 30

similarities: both used to catch fish Both have a curved shape to hold onto fish once they bite. Differences: Indigenous hooks were made from natural materials like shells or bones; modern hooks are usually made of metal. Traditional hooks were handmade, while modern hooks are factory-made. Modern hooks are often stronger and more durable than shell hooks. meatl is stronger than bone and skin

Question 31

what is wetsanding?

Answer 31

Wet sanding is the process of using an abrasive with water or another liquid to sand down a material. The water or other liquid helps remove any grit particles from the sandpaper left over from dry sanding to ensure a smooth and glossy finish.

Question 32

what is the process of wetsanding?

Answer 32

1. Begin by smoothing out the edges of your acrylic with low grit sandpaper and wet sand the edges. 2. Rinse your sandpaper as needed to stop it clogging up. 3. As the edges level and smooth move onto the sandpaper with the grit of 400 to give a more polished finish. 4.Finish off by smoothing the acrylic edges with the fine 600-grit sandpaper. Your acrylic should start showing smooth polished edges.

Question 33

safety benefits of wetsanding?

Answer 33

Since cut particles are wet when sanded, wet sanding virtually eliminates airborne dust. This reduces exposure to small particles.

Question 34

how to finish off your acrilyic?

Answer 34

Do not remove the paper covering on the acrylic until you have cut and fully sanded the piece. Use wet sandpaper for finishing or smoothing acrylic edges. Normally 180-320 grit (in other words, very fine) " wet or dry" paper is used along with plenty of water in a container. If done by hand, use a sanding block to keep the edges even. When you are sanding your piece you must wear a mask and work in a ventilated area

Question 35

Would you move from low to high grit, or high to low grit when sanding?

Answer 35

low to high

Question 36

Why do you need to leave the protective paper on the acrylic while sanding?

Answer 36

For optimal protection from scratching during transport and in storage,

Question 37

List 2 reason why you would wet the sand paper when sanding acrylic:

Answer 37

Reduces Heat: Wetting the sandpaper keeps it cool, which prevents the acrylic from melting or warping due to friction. Smooth Finish: Water helps wash away acrylic dust and debris, allowing for a smoother, clearer finish on the surface.

Question 38

Describe how laser cutting actually cuts or etches materials:

Answer 38

Laser cutting is a type of thermal separation process. The laser beam hits the surface of the material and heats it so strongly that it melts or completely vaporizes. Once the laser beam has completely penetrated the material at one point, the actual cutting process begins.

Question 39

What are the benefits of laser cutting?

Answer 39

high precision, no material contamination, high speed,, a wide variety of materials, and a wide variety of applications and industries.

Question 40

5 products that can be created on a laser cutter:

Answer 40

acrylic, paper, carboard, metal, glass

Question 41

List the strengths and weaknesses of acrylic:

Answer 41

strenghts: lightwieght durable weather resistant very transparent weaknesses: scratch prone sensitive to heat brittle under stress

Question 42

Provide 5 examples of end uses of acrylic,

Answer 42

Display Cases and Picture Frames Aquariums Signage Protective Barriers Automotive and Aerospace Windows