IB Design Technology Topic A3.3.7 Pulley Systems Revision Notes (HL)

IB Design Technology Topic A3.3.7 Pulley Systems Revision Notes (HL) | RevisionDojo

Written by official IB examiners

Pulleys: Redirecting and Multiplying a Pull

Definition

Pulley

A grooved wheel that uses a rope, cord, chain, or cable to transmit energy and motion.

A pulley is a grooved wheel that a rope or belt runs over, and how you arrange it decides what it does for you.
The mechanical advantage defined in A3.3.3 is the measure used to judge each arrangement.

The Parts of a Pulley System

Pulley wheel: a disc with a grooved rim that holds the rope or belt in place.
Rope or belt: connects the pulleys and carries the force between them.
Axle: the shaft the wheel turns on.
Frame or housing: supports the pulley and keeps it aligned.

The Three Arrangements

The same wheel gives a completely different result depending on whether it is anchored or free to travel.
Read each one asking whether it changes the direction of the pull, the size of it, or both.

Fixed Pulley

Definition

Fixed Pulley

A pulley that is attached to a fixed support and changes the direction of force without altering the mechanical advantage.

Function: changes only the direction of the force, so you can pull down to lift something up.
Example: a flagpole, where you haul downwards and the flag rises.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Pulleys: Redirecting and Multiplying a Pull

Definition

Pulley

A grooved wheel that uses a rope, cord, chain, or cable to transmit energy and motion.

A pulley is a grooved wheel that a rope or belt runs over, and how you arrange it decides what it does for you.
The mechanical advantage defined in A3.3.3 is the measure used to judge each arrangement.

The Parts of a Pulley System

Pulley wheel: a disc with a grooved rim that holds the rope or belt in place.
Rope or belt: connects the pulleys and carries the force between them.
Axle: the shaft the wheel turns on.
Frame or housing: supports the pulley and keeps it aligned.

The Three Arrangements

The same wheel gives a completely different result depending on whether it is anchored or free to travel.
Read each one asking whether it changes the direction of the pull, the size of it, or both.

Fixed Pulley

Definition

Fixed Pulley

A pulley that is attached to a fixed support and changes the direction of force without altering the mechanical advantage.

Function: changes only the direction of the force, so you can pull down to lift something up.
Example: a flagpole, where you haul downwards and the flag rises.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

IB Design Technology Topic A3.3.7: Pulley Systems Notes

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

Pulleys: Redirecting and Multiplying a Pull

The Parts of a Pulley System

The Three Arrangements

Fixed Pulley

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Pulleys: Redirecting and Multiplying a Pull

The Parts of a Pulley System

The Three Arrangements

Fixed Pulley

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account