Ch+4+Sec+8

It is harder to push/pull a roller coaster up a hill then down
 * What do you see?**

It takes the same amount of energy to pull the roller coaster up a steep incline then a gentile incline. It is much easier to bring it up a gentile incline because it takes less acceleration
 * What do you think?**


 * Physics Talk**
 * Work
 * Work: the products of displacement and the force in the direction of the displacement; the energy transferred to an object
 * W=F*d
 * F: force parallel to the displacement
 * d: displacement
 * Power
 * Power: the work done divided by the time elapsed; the speed at which work is done and energy is transferred
 * P=W/∆t
 * Watt: the SI unit for power
 * 1W=1J/s

1. When a spring scale is used to work pulling a cart to the top of an incline, the energy has gone into GPE when the cart is at rest on top
 * Checking up**

2. The roller coaster gets its GPE from its height at the top of the first hill

3. Truckers use a ramp when loading a truck because they are gradualy changing the GPE

4. When brakes stop the roller coaster, the Kinetic energy lessens due to friction

5. Watt

If they are the same distance, the amount of energy to pull the roller coasters up are equal.
 * WHat do you think now?**

1. a. The GPE of the first cart is two times greater then the second b. Work=∆GPE, the first car has done 2x the amount of work as the second c. THe same amount as ∆GPE d. .5(GPE) e.It is mostly KE with some GPE f. X
 * Physics to go**

2. a b.

c. d.

3. When they say conserve, they mean "don't waist energy"

4. It would have taken a bit more force

5.