Download presentation
Presentation is loading. Please wait.
1
Power is the rate at which work is done.
2
Answer Me!!! What does it mean to be powerful?
3
Power Power is the rate at which work is done.
Since you know that v = d/t: Power is measured in J/s or Watts (W)
4
Practice Problem 1 A 3 kg block is initially at rest on a frictionless horizontal surface. The block is moved 8 m in 2 seconds by the application of a 12 N horizontal force. What is the average power developed while moving the block?
5
Practice Problem 2 A 4.0x103 W motor applies a force of 8x102 N to move a boat at a constant speed. How far does the boat move in 16 seconds?
6
Practice Problem 3 A motor having a power rating of 500 W is used to lift an object weighing 100 N. How much time does the motor take to lift the object a vertical distance of 10 m?
7
Practice Problem 4 What is the average power developed by a motor as it lifts a 400 kg mass at constant speed through a vertical distance of 10 m in 8 seconds?
8
Practice Problem 6 If the time required for a student to swim 500m is doubled, the power developed by the student would be Halved Doubled Quartered Quadrupled
9
Final Thought… A motor having a maximum power rating of 8.1x104 W is used to operate an elevator with a weight of 1.8x104 N. What is the maximum weight the motor can lift at an average speed of 3 m/s?
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.