Conservation of Energy Whiteboard Problems 1. A 40.0 kg test rocket is fired vertically on a level surface. Its fuel gives it a kinetic energy of 3.00 x10³ J before it leaves the pad. What is the maximum height the rocket will reach? 2. A 20.0 kg object is dropped off of a 30.0 m cliff. How fast is the object going when it hits the ground? 3. A 150. kg roller coaster is released from rest at the top of a 50.0 m hill. How fast will it be going if the second hill is 10 m high? 4. A 0.300 kg toy has a spring attached to it so it can be shot straight up into the air. The spring is compressed 0.0500 m and has a spring constant of 300. N/m. A) Find the KE of the object when it is shot into the air. B) Find the maximum height of the toy (relative to the end of the barrel).

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Q: 0.8 0.6 0.4 0.2 0.25 0.50 0.75 1.00 Position, x (m) Force, F (N)

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.