Class test 1

• What is CAD?

  CAD is computer aided design. It is the process of designing a product within a software. This allows you to create an accurate product with very accurate dimensions.
• What is CAM?

  CAM is computer aided manufacture. This allows you to produce your product that you designed within a CAD software. It allows you to produce many identical products at the same quality control.
• CAD advantages

  • Saves time
  • Increases productivity
  • Improves accuracy
  • Decreases human errors
  • Quick sharing for collaboration
• CAM advantages

  • Fast production
  • Accurate Production
  • Machines can constantly run
  • Easy for producing mass products
  • Improves quality controll
• CAD disadvantages

  • Work can be lost
  • Cost
  • Prone to viruses
  • Computer errors
• CAM disadvantages

  • Expensive
  • Malfunctions
  • Downtime required for maintenance
  • Need a skilled workforce
• How can CAD be used in a design process?

  Cad can be used in the design process as it allows designers to create multiple drafts of their product in accurate dimensions whilst gaining a 2d or 3d visualisation.
• How can CAM be used in a design process?

  CAM can be used in a design process as it allows designers to create multiple models/drafts. This helps the designer to make adjustments and perfect their final design. It also allows them to print their final design.
• What is sustainability?

  The ability to meet todays needs without compromising the needs of future generations.
• Sustainability examples in products

  • Recycled clothes/ equipment - Allows material not to go to waste and it can be used on other products.
  • Biodegradable products - E.g cardboard straws, This allows material to be used the same but if littered, it will decompose faster than plastic
  • Reusable products - E.g water bottles, this allows costumers to gain a useful product that can be reused without damaging the environment.
• What are smart materials?

  Materials that change/react to changes in their environment
• What do smart materials react to?

  • Temperature
  • Light
  • Pressure
  • Electrical input
• How do Smart materials react?

  They change colour, shape or resistance
• Shape memory alloys

  • They return to their original shape if heated
  • Used in Medical practices
• Polymorph

  • Thermoforming polymer, granular form
  • When heated in water to 62 degrees they soften allowing them to be moulded
  • Solidifies on cooling
  • When heated it becomes pliable
  • Used in school products and machinery tools
• Photochromic pigment

  • They change colour in response to light
  • Used in sunglasses in response to UV radiation
• Thermochromic pigment

  • Changes colour in response to heat
  • Can be engineered to change at specific temperatures
  • Used in heat reactive equipment eg mugs and thermometers
• What is a metal?

  An element that has high electric conductivity, lister and malleable
• What is an alloy?

  A substance formed due to the combination of 2 or more metals.
• What is a non ferrous metal?

  A metal that does not contain iron.
• Non ferrous metal examples

  • Copper - Good conductor of electricity. Used in wiring and gas + water pipes
  • Aluminium light weight - aesthetically pleasing, used in air crafts, strong
  • Pure metals
• What is a ferrous metal?

  Contains Iron (Fe)
• Ferrous metals examples

  • They all corrode as they contain iron
  • Magnetic
  • Mild steel/High carbon steel - used in tooling
  • Stainless steel - malleable, soft, hard, tough, resistant to corroding.
• Alloy examples

  • Brass - aesthetically pleasing, high malleability, good conductor of heat and electricity used in ornaments
  • Pewter - Tin, blue gray, malleable, collectable trophies
  • Copper - low melting point, tableware.
• State Newton’s First Law of Motion.

  An object will remain at rest or continue moving at constant velocity unless acted on by an unbalanced force.
• State Newton’s Second Law of Motion.

  The acceleration of an object is directly proportional to the resultant force and inversely proportional to its mass.
• What is the formula for Newton’s Second Law?

  F = ma (Force = mass × acceleration)
• State Newton’s Third Law of Motion.

  For every action, there is an equal and opposite reaction.
• "What is the equation for momentum?","momentum = mass × velocity ; p = mv"
• "How does momentum depend on mass and velocity?","Momentum increases with mass and velocity; more mass or higher speed = greater momentum."
• "What is the unit of momentum?","kg·m/s"
• "What is Newton's second law in terms of momentum?","F = Δp / t = (mv - mu) / t"
• "What does Newton's second law tell us about force and momentum?","Force is the rate of change of momentum."
• "What is the law of conservation of momentum?","Total momentum before an interaction = total momentum after, if no external forces act."
• "How does Newton's third law relate to conservation of momentum?","Action and reaction forces are equal and opposite, so momentum is conserved in interactions."
• "What is the equation for kinetic energy?","KE = ½mv²"
• "When is kinetic energy conserved in a collision?","In elastic collisions (perfectly bouncy)."
• "When is kinetic energy not conserved in a collision?","In inelastic collisions (objects stick together or deform)."
• "What is the SUVAT equation linking v, u, a, and t?","v = u + at"
• "What is the SUVAT equation linking x, u, v, and t?","x = ½(u + v)t"