PHYSICS

• what Is weight measured in

  Newton meters
• What are Balanced forces ?❓❓

  When two forces are the same strength but working in opposite directions
• What are unbalanced forces ?❓❓❓

  When two forces work in opposite directions directions that are not the same strength
• What is the definition of friction❓❓

  friction is a force caused by two things rubbing together
• What is air resistance and water resistance ❓❓

  They are a type of friction
• What is upthrust ⬆️❓❓ 


  Upthrust pushes things up. things float in water because of upthrust
• What are some examples of non contact forces ❓❓


  Magnetism🧲 and gravity and static electricity ⚡️
• What are some example of contact forces❓❓❓


  Friction and air resistance and water resistance 💧 and upthrust ⬆️
• what is density ❓❓❓


  Density is the mass of a certain volume of something and it can be calculated with this formula -> DENSITY = MASS / VOLUME (g\cm3
• What are some properties of light 💡

  Travels in straight lines and light travels faster than sound
• Light travels at the speed of

  300 million m/s
• the angle of incidence = angle of reflection
• Definition of luminous

  Gives off its own light
• Definition of transparent 


  See through / clear image
• Definition Of translucent

  Allows some light through but not a clear image
• Definition of opaque

  Allows no light through and casts a shadow
• What is refraction❓❓❓❓

  When light goes from a less dense to more dense medium at an angle : light appears to bend but it just changes direction 🧭
• what is reflection ❓

  When light rays hit a surface and bounce off
• what is dispersion 💡

  the splitting of white light in to a spectrum of colours
• What are some qualities of a Low pitch sound wave

  long thick loose string
• what are some qualities of a high pitch sound wave

  short thin tight string
• What is the speed of sound

  330 m/s