- Work refers to an activity involving a force and movement in the directon of the force. A force of 20 newtons pushing an object 5 meters in the direction of the force does 100 joules of work. 1
- Energy is the capacity for doing work. You must have energy to accomplish work - it is like the "currency" for performing work. To do 100 joules of work, you must expend 100 joules of energy. 1
- Power is the rate of doing work or the rate of using energy, which are numerically the same. If you do 100 joules of work in one second (using 100 joules of energy), the power is 100 watts. 1
- An open system is a system which continuously interacts with its environment.
- An isolated system (closed) is a physical system that does not interact with its surroundings. An isolated system obeys conservation laws: its total energy and mass stay constant.
- I can describe energy being transferred from one place to another in a system.
- I can describe energy being transformed from one form to another in a system and explain how energy is conserved in a closed system.
- Lab station work: At each station draw and label a simple diagram showing:
- The device and its major components.
- The forms of energy present. There may be several forms at each station.
- How energy is being transformed. There may be transformations at each station.
- How energy is being transferred. There may be transferences at each station.
- Explain how this is an open or closed system.
- Completed Transfer Table
- Completed Transform table
Note: A device may need your interaction for it to operate. You do not need to include the system that is you beyond the initial interaction.
Example: the windup flashlight needs the handle to be rotated. Limit discussion of you to just that initial turning of the handle. This is about the device.