OCR formulae

What is the formula to work out Ybar in centroid questions?

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What is the minimum number of elements you could divide this into to solve for centre of area?

• 1

• 2

• 3

• 4

What class of lever is this?

• Class 1

• Class 2

• Class 3

What class of lever is this?

• Class 1

• Class 2

• Class 3

Which formula is correct?

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• 

Which of these formulae is correct for gear ratios

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• 

Which of these is the correct formulae?

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• 

What tppe of gear is Gear B?

What type of Gear is this?

• Rack and Pinion

• Spur and pinion

• Worm and worm wheel

• Helical Bevel

Which of these is not a type of belt?

• Vee belt

• Flat belt

• Toothed belt

• Wide belt