Kinetic and Potential Energy Stores



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  • Anything which moves = energy in kinetic energy stores
  • Object speeds up = energy transferred to this store
  • Object slows down = energy transferred away from this store
  • Greater mass and faster an object is going =more energy in its kinetic energy store
  • E(k) = ½ mv²
  • Kinetic energy (j) = a half X mass (kg) X (speed)² (m/s) ²
  • Raised objects = energy stored in gravitational potential energy stores
  • an object in gravitational field = work done = transfer of energy to gravitational potential energy store
  • Higher the object = more energy transferred
  • E(p) = mgh
  • Gravitational potential energy (j) = mass (kg) X gravitational field strength (N/kg) X height (m)
  • Something falls = gravitational potential energy store → kinetic energy store
  • Falling object when no air resistance: energy lost rom the gravitational potential energy store = energy gained in kinetic energy store
  • Air resistance acts on all falling objects
  • Stretching = transfers energy to elastic potential energy stores if the limit of proportionality hasn’t been exceeded.
  • E(e)= 1/2 ke²
  • Elastic potential energy (j) = a half X spring constant (N/m) X (extension)² (m)²
  • How long have you…? (present perfect 4) Exercises


     

    improve-tution1

     

    Use the information given to create questions beginning with ‘How long…?’

    • It is snowing.

    • The weather is shining.

    • John and Kate are married.

    • My brother has gone on holiday.

    • My aunty and uncle live in Canada.

    • My sister is a teacher.

    • I work at the chemist.

    • I’ve known Susan since I was a baby.

    • Jonathan is learning to speak to Mandarin.

     

     

     

    Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)

    • I have known Kate a long time.

    • My brother has been playing the piano he was 11 years old.

    • My mum and dad on holiday to America. They

    gone since last Sunday.

    • I Ben and Emma since primary school.

    We to the same primary and secondary school.

    • My sister learning to speak French because she
    is going to France next month.

     

     

    Use the appropriate words in the missing gaps.

    have you lived       lives      to

    has been       works        have known

    I have bought       have worked.

    • My sister in Spain. She is studying Spanish

    with her friend Rosie. I Rosie since I was 5.

    • Spencer like with Jamie. They have worked

    together for 2 years.

    • How long in Australia?

    • a new dress for prom.

    • He to Thorpe park.

     

     

    Challenge: Create 4 of your own questions beginning with ‘How long……?’

    1.

    2.

    3.

    4.

     

     

     

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