# static principles Static uses static problems review tests

• Slides: 38

static principles Static uses static problems review tests resources

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+ _ _+ _ + + _ _ + _ + + + smart activity previous next smart

1. Friction charges + the objects _ _ _ + _ + _ _+ 2. Electrons move from the cloth to the rod + 3. The rod becomes negative by gaining -charge 4. the cloth becomes + positive by losing _ _ + + _ -charge + + 5. only -charges move + previous next + _ _ + _ + + + _ _ _+ + + _ _ +

Wall Negatively charged strip moves towards the wall + Negative charges are repelled away from the surface _ This makes the surface positively charged The rod is attracted to the wall + We say that charge has been INDUCED _ + _ _+ _ + + The rod is moved away from the wall The negative charges return to the surface The wall becomes neutral again + previous + _ _ next

When insulating materials rub together they can become charged. Charging is caused by Charge _______ has been rubbed off one material onto the other. previous next

negatively charged and the One object becomes _____ friction other becomes charged. There are types of charge. We call them positive and negative. Only previous charges can move. next

Explain how objects become positively charged? LIKE CHARGES UNLIKE CHARGES (- and – , + and +) (+ and -)

Answers are on the next slide

When insulating materials rub together they can become charged. (charging is caused by friction ______). _______ has been rubbed off one material onto the Charge other. One object becomes _____ negatively charged and the other becomes positively ____ charged. two types of charge. We call them There are ___ positive and negative charges can move. Only _______ How do objects become positively charged? LIKE CHARGES REPEL (- and – , + and +) UNLIKE CHARGES ATTRACT(+ and -) previous next

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How to print a full stop + Positively charged nozzle previous next

To print a line the top plate can be made more negative. previous next

How is this letter i printed? The ink cartridge is moved horizontally at the same time. This allows any letters to be printed. previous next

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I wish the sun would hurry up and ripen this orange! Help! I’m more worried about the farmers insecticide spray! The tale of the clever INSECT! previous next

+ + I wish the sun would hurry up and ripen this orange! Help! I’m more worried about the OH NO! The farmers isinsecticide spray! using static electricity to charge the spray! Help! The tale of the clever FARMER! Can you explain what is happening he previous next

+ + • Why do the positively charged droplets spread out as they leave the nozzle? • What happens to the droplets which go past the leaves? Click for the answers • Like charges repel! • Instead of falling the charged drops are attracted back to the orange! previous next

Explain why: - 1 The paint spreads out after leaving the nozzle 2 Why is this useful? 3 Explain what happens to paint which goes past the object 4 Why is this useful? 1 all the droplets are negatively charged so they 2 It gives a wider spray so you get better coverage and an 3 It is attracted to the back of the object by the 4 It paints the back of the object and less paint is coat

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Metal chimney previous next smart

+- previous - • Smoke particles reach the Clean positive metal plate gases • electrons are removed and travel towards the plate • the positive ions drift to the earthed metal wall • Clean gases leave the chimney + • Smoke is deposited on the chimney walls • The dust is removed and used to make breeze blocks next smart

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The problem! previous next smart

The solution! The ground stroke is more likely to strike a pointed object The lightning conductor gives an path to the for the current The building is kept safe previous next smart

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The most dangerous moment for any aircraft is NOT it is flying when it is refuelling landing previous next

The most dangerous moment for any aircraft is when it is refuelling Click to find out what happens! previous next

The most dangerous moment for any aircraft is when it is refuelling A metal bonding line connects the tanker to the aircraft BEFORE refuelling starts. previous next

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1 Objects become charged by 2 Static electricity builds up on substances which are 3 Before rubbing objects together they will usually be

4 An object becomes positively charged by 5 A negatively charged object has 6 Like charges always

7 Unlike charges always 8 Only charges can move

Answers are on the next slide

1 Objects become charged by friction _____ (rubbing) 2 Static electricity builds up on substances which are conductors/insulators 3 Before rubbing objects together they will usually be neutral/charged 4 An object becomes positively charged by losing _______ electrons(negative _______ charge) gaining 5 A negatively charged object has _______________ electrons(negatives) repel 6 Like charges always _______ 7 Unlike charges always _______ attract 8 Only negative _______ charges can move

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