Section 6.10Power

Law of Conservation of Energy How do I calculate power?

Power Power: the rate at which work is done

Unit: Watts

Going Up Stairs Work of going up the stairs

Running

Walking

Power of going up the stairs Running

Walking

Going Up Stairs A 60 kg jogger runs up a long flight

of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. What is the joggers power output?

BikingDUE TO MOUNTAINOUS COURSES, LIKE THE TOUR DE FRANCE, BIKERS USE POWERMETERS.

Electricity Closer to home, power is the rate of electricity usage. We all have power

meters on the outside of our house

Horsepower Frequently hear about horsepower

and car engines

Actually started as a measure of how much a horse could actually do

1 horsepower = 1hp = 550 = 746 Watts

Cars The work engines do is overcoming

friction, air resistance, and gravity.

Acceleration is also work

Homework Page 164

# 58 – 66, skip # 64