Mechanics

Look at the diagram of the cyclist. Which of the following labels for A and B are correct? (N.B. There may be more than one correct answer)

• A = Driver B = Input

• A = Driven B = Output

• A = Driver B = Driven

• A = Output B = Input

• A = Input B = Output

What is gear ratio equal to?

• Gear Ratio = Driven x Driver

• Gear Ratio = Driven ÷ Driver

• Gear Ratio = Input Speed ÷ Driver

• Gear Ratio = Output Speed x Driver

Select the correct memory triangle for calculating gear ratios.

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Which of the following memory triangles can be used to calculate gear speeds?

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What is output speed equal to?

• Output speed = Gear Ratio ÷ Input Speed

• Output speed = Input Speed ÷ Gear Ratio

• Output speed = Gear Ratio x Driven

• Output speed = Driver x Gear Ratio

Describe the types of motion (starting from the driver to the driven) that the cam and follower mechanism gives

• (Driver) Linear → (Driven) Rotary

• (Driver) Rotary → (Driven) Linear

• (Driver) Rotary → (Driven) Oscillation

• (Driver) Oscillation → (Driven) Reciprocating

• (Driver) Rotary → (Driven) Reciprocating

Which of the following equations can you use to calculate the gear ratio of a compound gear labelled A, B, C, D as shown in the diagram?

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What are the correct labels for this lever (tweezers)? Think of the answer, or write it down, before you select one of the choices below.

• A = Fulcrum B = Load C = Effort

• A = Effort B = Load C = Effort

• A = Load B = Effort C = Fulcrum

• A = Fulcrum B = Effort C = Load

What class of lever is the tweezers?

• Class 1

• Class 2

• Class 3

What type of motion does the quick return mechanism involve?

• Reciprocating → Linear

• Reciprocating → Rotary

• Rotary → Reciprocating

• Rotary → Oscillating