Table of Contents
Week 1 | KS3 Physics
Week 2 | KS3 Physics
Week 3 | KS3 Physics
Week 4| KS3 Physics
Week 5| KS3 Physics
Week 6| KS3 Physics
Week 7| KS3 Physics
- Static electricity = charges which aren’t free to move = causes the charges to build up in one place = ends with a spark or a shock
- Negatively charged electrons are moved off one material to another material when insulating materials are rubbed together = materials are now electrically charged (positive static charge on one material and equal negative static charge on the other)
- Polythene rod and cloth: electrons move from the cloth to the rod, leaving the rod with a negative static charge and the cloth a positive static charge
- Acetate rod and cloth : electrons move from the rod to the cloth, leaving the rod with a negative static charge and the cloth a negative static charge.
- Positive charges DO NOT move. Positive and negative electrostatic charges are only produced bymoving electrons .
- Positive static charge = caused by electrons moving elsewhere
- Material loses electrons = loses negative charge = left with an equal positive charge
- Electric charge builds on an object = potential difference between the object and earth (at 0V) INCREASES
- If PD gets big enough = electrons can jump across the gap between the charged object and earth = SPARK
- Electrons can also jump to any earthed conductor which is near. Therefore, you get static shocks when you get out of the car: charge builds up on cars metal frame. If you touch the car the charge travels through you to earth
- Usually happens when the gap is small.
- Two things with opposite electric charges = attracted to each other
- Two things with same electric charges =repel each other
- Forces get weaker as the distance between objects increases
- Forces will cause the objects to move If they can = electrostatic attraction/repulsion and is a non-contact force (objects do not need to touch)
How long have you…? (present perfect 4) Exercises
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.
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……?’