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Deck of Cards
idlittledeck

Card
labelMethod 1: Dynamics

Method 1: Dynamics

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idsysa1
Systems:
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The pulley and the bucket are treated as separate objects. The bucket can be treated as a , but the pulley must be treated as a .

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idinta1
Interactions:
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idinta1

The pulley and the bucket are each subject to external influences from the rope () and from the earth (gravity). The pulley is also subject to a from the axle, but we will choose the axle as the axis of rotation so the axle produces no torque (it has zero ).

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idmoda1
Model:
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idmoda1

and

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idinta2
Interactions:
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idinta2

The system is subject to external forces from the earth acting on the bucket and the pulley (gravity) and from the normal force the axle acting on the pulley (contact force). If we choose the axis of rotation to coincide with the axle of the pulley, then the axle's force and gravity acting on the pulley each produce no torque. We need only consider the effects of gravity acting on the bucket.

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idmoda2
Model:
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idmoda2

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idappa2
Approach:

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idappa2
Card
Method 2: Dynamics
Method 2: Dynamics

Deck of Cards
littledeck
littledeck

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Deck of Cards
idlittledeck2

Card
labelMethod 1: Kinematics

Method 1: Kinematics

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idsysb1
System:
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idsysb1

Bucket as .

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idappb1
Approach:

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idappb1
Card
Method 1: Kinematics
Method 1: KinematicsMethod1Method1

Card
labelMethod 2: Energy

Method 2: Energy

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idsysb2
System:
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idsysb2

Treat the bucket, pulley and the earth as a single system.

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idappb2
Approach:

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idappb2
Card
Method 2: Energy
Method 2: Energy

Deck of Cards
littledeck2
littledeck2

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Deck of Cards
bigdeck
bigdeck

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