HARDER PHYSCISCTOPIC 1

• Walking speed


  1.5
• Running speed


  3
• Cycling speed 


  6
• Car speed 


  13
• Sound waves


  330m/s in
• Distance time graph

  1)slanted line

  2)straight line

  3)acceleration

  4)curve going down

  Constant speed, stationary,curved line, deceleration  
• How can u calculate speed on distance time graph 


  Find gradient
• What does gradient on velocity time graph mean?


  Acceleration
• Velocity time graph

  1. Slanted Line
  2. Slanted line in opposite direction
  3. Straight Lind
  4. Curved line up
  5. Curved line going down
  6. Flat line on x axis

  Constant acceleration, constant decelerations, Constant velocity,increase acceleration, increase deceleration, stationary
• What is areas under velocity time graph?

  Distance
• Why does object orbiting circular motion have constant speed and acceleration?


  Direction is changing
• What is inertia?


  Tendency for objects to remain at rest
• What is inertia mass?


  How difficult it is to change velocity of object
• What 2 things increase circular motion 


  Speed and mass
• What decreases circular motion


  Orbital radius
• What is newton's third law

  When 2 objects interact they exert equal and opposit force on ineWhen 2 objects interact they exert equal and opposite force on one another
• How-to reduce damage from car crahs

  Spread the change in momentum over period of time by reducing force using safety features
• How do crumple zones reduce force?


  Small amount of time for car fo lose momentum before it crumple
• Sea belts can:


  Stop u from flying out
• 9 Types of energy


  Elastic potential, chemical, thermal,kinetic, gravitational potential,nuclear,electrostatic,magnetic
• What are the 4 ways energy transferred:


  Mechanically,heating,electriccaly,radiation
• Vehicle slowing down is:

  Kinetic to thermal
• How to reduce unwanted energy transfers:


  Thermal insulation and lubricant.
• Thermal insulation

  • Reduce hear loss by convection by having thick walla with low thermal conductivity
  • Fill air gap with insulating form
  • Double glazing windows have tiny gaps which reduces convection
• Cons of fossil fuels


  Non renewable, produces co2 when burned which is a greenhouse gas,produces toxic gas when burned
• Nuclear fuels cons


  Don't produce any pollutants and takes longer to run out
• Nuclear fuels pros


  Produces radioactive waste, expensive and runs out
• How do wind turbines work


  Movement of wind generator converts kinetic energy into electricity
• How does lubrication improve efficiency 


  Spreads oli substance which reduces friction so more useful energy
• Method to make electricity

  1. Burn fuel makes heat
  2. Boils water and makes steam
  3. Turns a turbine
  4. Turns a generator makes electricity