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Chapter Work

Physics Work

Rate of doing work

 5th March 2024 at 10:50am

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:

  1. 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.
  2. Time (t): The duration it takes to complete the work.
  3. 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).

Activity 10.16: Rate of Doing Work