Chapter+2,+Section+4

What Do You Think Now:

Investigation

Part A.

1. Yes they hit the floor at the same time.

2. It hit the floor at the same time, or they hit the floor at different, yet very similar times.

3.

A. No it doesn't because it just means that the coin will hit the floor at a faster velocity.

B. It does because there is more force being applied to the coin, so therefore it will travel farther, but because of gravity, it falls at the same rate.

C.

4. A. They hit the floor at the same time

B. Changing the height of the coins doesn't have an effect.

PART B

1. I believe that he will be able to catch the ball every time.

2. A. If you had the ball thrown by the girl on the chair, then the ball, if the chair keeps moving with it, seems to stay still, however if you take the chair away, it looks loike it is arching. If the chair is moving at 2m/s/s, then the ball also moves at 2 m/s/s. B. What affects the range of the ball is how fast the chair moves.

Reading: Projectile Motion: No lift, no air Move in Parabola path needs gravity Golf Ball, football, soccer ball, basket ball, volley ball Some Rockets Dying bird (when shot in flight) Constant velocity horrizontally Constant acceleration vertically

As it moves upwards, slows down, reaches top, stops, then goes back down at same acceleration.

Physics To Go

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4. People think that a dropped bullet has less distance to travel to hit the ground.

5. The velocity of the balls horizontally doesn't have an effect vertical velocity.