- Define: applied force, work, energy, positive work, negative work.
- Distinguish between positive and negative work.
- Recognize situations where no work is performed on an object.
- Determine the component of an applied force that acts in the same direction as the displacement.
- Express the correct SI fundamental or derived unit for work and energy.
- Recognize that work is a scalar quantity.
- Calculate work graphically from an applied force versus displacement graph.
- Give examples how energy is transferred from one object to another.
- Recognize that when energy transformations take place not all energy is used to produce useful work.
- Solve problems involving work and energy.
In this unit students will increase their abilities to:
- Work is the product of an applied force and the displacement in the direction of the applied force.
- Only the component of the applied force acting in the direction of the displacement contributes to the work done.
- 1 J = 1 Nm is the unit for work.
- Work is a scalar quantity.
- Work will be positive when the applied force and the displacement are in the same direction.
- Work will be negative when the applied force and the displacement are in opposite directions.
- Work can be determined graphically by finding the area under an applied force versus displacement graph.
- Energy is the ability to do work.
- since not all of the energy goes into doing useful work. Some is converted into heat or other types of energy.
- Maximizing efficiency during energy transformation helps to conserve valuable resources.