6.4.2 Energy Transfer worksheet - Free Printable

Problem Overview:

The task involves completing an energy transfer chain for various scenarios. The goal is to identify the Energy Store (start), Transfer Pathway, and Energy Store (end) for each scenario. The Law of Conservation of Energy states that energy cannot be created or destroyed but can only be transferred or transformed from one form to another.

Solution:

#### 1. Rubbing Hands
- Energy Store (start): Kinetic (movement of hands)
- Transfer Pathway: Mechanical
- Energy Store (end): Thermal (heat generated by friction)

#### 2. Shaking a Tin of Screws
- Energy Store (start): Kinetic (movement of the tin and screws)
- Transfer Pathway: Mechanical
- Energy Store (end): Sound (thermal) (vibrations create sound waves and some heat)

#### 3. Striking a Match
- Energy Store (start): Chemical (stored in the match head)
- Transfer Pathway: Mechanical (friction when striking)
- Energy Store (end): Thermal and Light (chemical energy is converted into heat and light when the match ignites)

#### 4. Battery and Bell
- Energy Store (start): Chemical (stored in the battery)
- Transfer Pathway: Electrical
- Energy Store (end): Sound (electrical energy powers the bell, which vibrates to produce sound)

#### 5. Clockwork Timer
- Energy Store (start): Elastic Potential (stored in the wound spring)
- Transfer Pathway: Mechanical
- Energy Store (end): Kinetic (the spring unwinds, converting stored energy into motion)

Completed Table:

| Diagram | Energy Store (start) | Transfer Pathway | Energy Store (end) |
|-----------------------------|----------------------|------------------|--------------------|
| 1. Rubbing hands | Kinetic | Mechanical | Thermal |
| 2. Shaking a tin of screws | Kinetic | Mechanical | Sound (thermal) |
| 3. Striking a match | Chemical | Mechanical | Thermal and Light |
| 4. Battery and Bell | Chemical | Electrical | Sound |
| 5. Clockwork timer | Elastic Potential | Mechanical | Kinetic |

Explanation:

1. Rubbing Hands: When you rub your hands together, the kinetic energy from the movement is converted into thermal energy due to friction.
2. Shaking a Tin of Screws: Shaking the tin causes mechanical energy to be transferred, resulting in sound waves and some thermal energy due to friction.
3. Striking a Match: The chemical energy stored in the match head is released as thermal and light energy when struck, converting mechanical energy into heat and light.
4. Battery and Bell: The chemical energy in the battery is converted into electrical energy, which then powers the bell to produce sound.
5. Clockwork Timer: The elastic potential energy stored in the wound spring is converted into mechanical energy as the spring unwinds, driving the mechanism.

This completes the energy transfer chains for all scenarios. Each step follows the principle of energy conservation, ensuring that energy is neither created nor destroyed but merely transformed or transferred.