Ch6_Knapelr

Hw lesson 2a 1/30/12

Forces can either be internal or external. External forces include applied force, normal force, tension force, friction force, and air resistance force. Internal forces include gravity forces, magnetic forces, electrical forces, and spring forces.
 * How can forces be categorized?**

It is important because when work is done you know that the external force has changed. If work is positive than it will gain energy and if its negative it will loose energy. Gain or loosing energy can be in the form of kinetic or potential energy, or both. Some times referred to nonconservative forces. Internal forces remain constant. Energy may then be transformed, from like kinetic to potential energy.
 * Why is it important to characterize forces?**

Why do my parents tell me to shut off the lights? Sample calculations

The eletctric bill: Calculate the average cost per kWh: Rate of the cost of electricity per kW=$0.18 Actual amount on bill = $.0175 These two amounts may be different because the total coast also includes other fees and taxes.
 * 1) the total dollar amount due - $167.67
 * 2) kWh consumed that month. – 925 kW

With all this information i found that the amount my parents pay for power each day is $2.04

Conclusion: This cost seems very low and when you multiply it by 30 days the bill would only come out to be about $60.00, which seems very low to me especially compared to the actual bill. This may be because my estimates of the amount of time i use these appliances were wrong. Also, i left out some major appliances off this list. I did not include my washing machine, the heating system in my house, the water heater, lights, and many other major objects. This may be why the price seems so low. To try to make the energy bill lower i should try to shut off the light whenever i leave a room. Also, i should remember to shut my T.V. off when i leave the room and to unplug when my chargers when i am not using them toc