Levers

Question 1

How is a first class levers set up and is there a mechanical advantage?

Answer 1

Fulcrum is central
Force and load are applied on either end
There’s a mechanical advantage

Question 2

What are some examples of first class levers?

Answer 2

Scissors
Crowbar

Question 3

How is a second class levers set up and is there a mechanical advantage?

Answer 3

Fulcrum on one end
Load in the middle and force on the end
There’s a mechanical advantage

Question 4

What are some examples of second class levers?

Answer 4

Wheelbarrow
Staple gun

Question 5

How is a third class lever set up and is there a mechanical advantage?

Answer 5

Fulcrum on one end
Force in the middle and load on the end
No mechanical advantage but more accuracy and detail in the movement

Question 6

How to calculate mechanical advantage?

Answer 6

MA=Force/Effort

Question 7

How to calculate velocity ratio?

Answer 7

VR=Distance moved by effort/distance moved by load

Question 8

How does a reverse motion linkage work and uses?

Answer 8

Reverses the input to go the opposite way
Used for foldable clothes horses

Question 9

How does a bell crank linkage work and uses?

Answer 9

Changes the direction of force through 90 degrees
Used in a bike brake to make it touch and stop the wheel

Question 10

How does a treadle linkage work and uses?

Answer 10

Converts rotary motion to oscillating
Windscreen wipers in a car

Question 11

How does a parallel motion linkage work and uses?

Answer 11

Makes input and output motion go in the same direction
Toolbox drawers

Question 12

How does a crank and slider linkage work and uses?

Answer 12

Converts rotary motion to reciprocating motion
Piston compressors and pumps