Section+8+chap+4

Section 8 toc

What Do You See?
page 436 5/31/11

They have to push you up the roller coaster. On the way down the cart brings the kids.

What Do You Think?
page 436 5/31/11

no

more power

Physics Talk
page 439 5/31/11

w=fd p=work/delta t
 * work:** the prodct of displacement and the force in the direction of the displacement; the energy transferred to an object
 * power:** the work done divided by the time ekaosed the speed at which work is done and energy is transferred
 * watt:** the SI unit for power; 1W=1j/s

Checking Up
page 442 5/31/11

1. The energy turns into GPE 2. the work and gravity 3. there is less force to gradually lift it than to lift it straight up 4. the brakes convert KE to thermal energy 5. J/s

Physics To Go
page 446 5/31/11

1a. There is more GPE on top 1b. 9.8 1c. the same 1e. GPE to KE to SPE 1f. when it hits the spring 2a. 1050 2b. 30 2c. 2000 2d. 350 3. transfer energy 4. the mass 5a. 200,000 5b. 10000