In physics, work is done when a force causes a displacement. Positive work occurs when the force and displacement are in the same direction, increasing the object's kinetic energy. Think of pushing a box across the floor. Negative work happens when the force and displacement are in opposite directions, decreasing the object's kinetic energy. An example is friction slowing down a moving object. Remember, work is calculated using the formula $W = F \cdot d \cdot cos(\theta)$, where $F$ is the force, $d$ is the displacement, and $\theta$ is the angle between them.
| Term | Definition |
|---|---|
| 1. Work | A. A force that opposes motion. |
| 2. Positive Work | B. The energy an object has due to its motion. |
| 3. Negative Work | C. The transfer of energy when a force causes a displacement. |
| 4. Kinetic Energy | D. Work done when the force and displacement are in the same direction. |
| 5. Friction | E. Work done when the force and displacement are in opposite directions. |
Match each term with its correct definition.
When a force and displacement are in the same direction, the work done is __________. This means the object's kinetic energy __________. However, if the force and displacement are in opposite directions, the work done is __________, causing the object's kinetic energy to __________. The formula to calculate work is $W = F \cdot d \cdot __________$.
Can work be zero even if a force is applied to an object? Explain your answer with an example.
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