Ch+4+Sec+3+KirnumB


 * Section 3**


 * What do you see? What do you think?**
 * I see frogs being launched in the air due to SPE. Their springs are being uncoiled and their speed is being recorded by a photogate.
 * The roller coaster gets up to its highest point with KE
 * It doesn't cost more to lift the roller coster filled with people


 * Physics talk**
 * Spring potential energy: energy stored in a spring due to its compression or stretch
 * SPE= 1/2kx 2


 * Checking up**
 * 1) When a pop-up toy pops, SPE is converted into KE
 * 2J
 * 2J
 * 1) Its distance (stretched or compressed) and its constant

5) There is only a certain amount of KE that is provided by the first hill and there isn't enough energy to make it over a higher hill. 6) There is work and friction that slows the roller coaster 7) GPE=mgh=(300)(9.8)(15)= 44,100 J 8) a. b. 45,000J c. KE=GPE 1/2 mv^2=mgh 1/2(15)^2=9.8h 11.5m=h
 * Physics To Go**

9) It is increasing, as h increases GPE increases

10) They all reach the same end point and reach the same GPE

11) a. yes, very similar b. 0.13 m

12) 6600 N/m 4.62m

13) KE=EPE mgh=.5kx^2 1.8J

Roller coasters get to its highest point by using energy and electricity. It does cost more to lift a heavier roller coster because it needs more electricity.More electrical energy is required to lift a heavier roller coaster because it has more mass. The height of the pop up toy lessened when the mass was larger.
 * What do you think now?**