Ch+4+Sec+6

Section 2
When someone accelerates upwards, they gain weight.
 * What do you see?**

Yes, w=m(g) and when you accelerate, the gravity changes because of the distance from the Earth. Yes, at different points you would get different measurements for weight while you mass will remain the same.
 * What do you think?**


 * Physics Talk**
 * Forces acting during acceleration
 * When an object at rest, the sum of the forces acting on that object equal zero
 * When an object moves up at a constant speed there is more force pulling down
 * Calculating Acceleration
 * F=mg
 * F=ma
 * Apparent weight
 * the weight of object when they are accelerating


 * Checking up**
 * 1) The sum of all forces acting on an object when it is moving up at a constant speed is zero.
 * 2) A person accelerating upwards on a roller coaster seems to have a heavier weight when compared to they are not accelerationg.
 * 3) You feel as if you weigh more because there is more force acting on you to bring you from rest, or a slower speed, into motion.
 * 4) The scale reads your actual weight, in free fall, everything falls at the same rate
 * 5) Air resistance

1. a. b. c
 * PTG**

2. a. b c. 4.
 * **Motion of the Elevator** || **Acceleration (up, down, zero)** ||  || **Relative Scale Reading (greater, less or equal to weight)** ||
 * At rest, bottom floor || v=0, a=0, ∑F=0 ||  || N=w ||
 * Starting at Rest, Increasing Up || v=UP, a=UP, ∑F= UP ||  || N>w ||
 * Continuing to move, Constant Up || v=UP, a=0, ∑F=0 ||  || N=w ||
 * Slowing down to top floor, Decreasing Up || v=UP, a=DOWN, ∑F=DOWN ||  || N<w ||
 * At rest, top floor || v=0, a=0, ∑F=0 ||  || N=w ||
 * Starting at rest, Increasing Down || v=DOWN, a=DOWN, ∑F=DOWN ||  || N<w ||
 * Continuing to move, Constant Down || v=DOWN, a=0, ∑F=0 ||  || N<w ||
 * Coming to a stop on the ground floor || v=DOWN, a=UP, ∑F=UP ||  || N<w ||

5. The person is accelerating downwards, v is down, a is down, net force is down: w<N

6. The person's weight will increase

7. a. Decrease b.

8. a. The scale will equal (9.8)(50)=490 b .

9. 1. Elevator is at rest 2. The elevator is accelerating down 3. The elevator is at rest

10. The greater the acceleration, the greater the thrill. People would find a 5m/s^2 accelerating exciting

Weight doesn't change. W=mg. m and g never change but the net force which puts you in motion makes it seem as if you weigh more.
 * What do you think now?**