You're absolutely right! The text accurately explains the concept of power in relation to the rate of doing work. Here are some key points:
- Stronger person: A stronger person can exert a greater force in a shorter time, allowing them to do the same work (e.g., lifting a box) as a weaker person but in a shorter duration.
- Vehicles and power: More powerful vehicles, like motorbikes and cars, typically have engines that can generate more power, enabling them to complete a journey (work done) in a shorter time compared to less powerful vehicles.
The text emphasizes that power is a measure of the speed of work done. It essentially reflects how quickly work is accomplished, not just the total amount of work done.
Here's a breakdown of the key points:
- Work (W): The amount of energy transferred or converted to achieve a specific task. It is calculated as W = F x d, where F is the force applied and d is the distance moved.
- Time (t): The duration it takes to complete the work.
- Power (P): The rate of doing work, calculated as P = W / t. It indicates how quickly work is done, measured in watts (W).
Therefore, powerful machines can do the same work as less powerful machines in a shorter period, reflecting their higher rate of work accomplished (higher power).