Section+6+chap+4

Section 6 toc

What do you see?
page 406 5/16/11

elevators, heavy guy pulls small guy upward

What do you think?
page 406 5/16/11

no and yes

Investigate
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part A

1a. 500 g 2a. 4a. 5a. yes, the gravity is pushing it down b. Yes, the spring holds it up c. no 6a.
 * || acceleration || scale reading ||
 * rest || zero || equal ||
 * constant || zero || equal ||
 * accelerating up || up || larger ||
 * rest on top || zero || equal ||
 * down constant || zero || equal ||
 * accelerating downward || down || less ||

Part B

1a. it is larger than 500 1b. more acceleration more force 2a. yes 2b. yes 2c. no 3a. 4a. more 5a. be less than normal b. be less than normal 6a. nothing b.

c. less d. yes it was less than normal 7a. acelerate up more accelerate down less constant same rest same 8a. same- accelerate up accelerate down rest at top different-angles flips seat belted in 9a. same time b. baseball paper is too light tape it up and yes

Checking Up
page 415 5/19/11

1. When an object is at rest the sum of the forces on that object equal zero 2. The weight is heavier when the roller coaster is accelerating 3. Earth pulls down on you with a force that is smaller than the force that the scale exerts on you upward 4. The scale will read a smaller force than before 5. Air resistance applies a force to raindrops that opposes the force of gravity

**Physics Talk**
page 410 5/19/11 Using Newton's first law the object is at rest and no net force acts on it. Using Newton's second law the object is at rest and has zero acceleration, so no net is acting on it. Fnet=ma Fw=mg where g=9.8N/kg

Physics To Go
page 418 5/19/11

1a. 19.6 1b. 49 1c.98 2a. 3.2 m 2b. 8m 2c. 16 m 3a. no because the lengths are not equal 3b. no 3c. yes 4. (up, down, zero) || scale reading (larger, smaller, equal to weight) || on top floor || zero || equal || moving down || down || smaller || down at constant speed || zero || zero || rest at bottom floor || down || smaller || at bottom floor || zero || zero || move up || up || larger || at constant speed || zero || zero || rest on top floor || up || larger || top floor || zero || equal || 5. Elevator is moving down 6. it will be larger 7a. decrease 9. when the elevator is accelerating up, the scale reading up higher and when the elevator is accelerating down, the scale reading is smal
 * || acceleration
 * a. elevator at rest
 * b. elevator starts
 * c. elevator moves
 * d. elevator comes to
 * e. elevator is at rest
 * f. elevator begins to
 * g. elevator moves up
 * h. elevator comes to
 * I. elevator at rest on