Section+4

=__//**Section 4- Projectile Motion: Launching Things into the Air**//__=

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What Do You See?
page 174 12/07/10

There is a kid with two heads who is symmetrical with holding donuts in his hand. There is a girl on top of a stool dropping/ throwing apples on each side of them.

What Do You Think?
page 174 12/07/10

The mass of the ball, the speed you throw it at, the wind conditions, the force acted upon it, and where on the ground you are standing.

Investigate
page 174 12/08/10

Part A: Observe two coins dropping
1a. yes 2a. Yes they hit at the same time 3a. No, it doesnt b. Yes c. 4a. same b. makes it go farther

Part B: Vertical and horizontal motion of a Projectile
1a. It will go behind him 2a.The ball just went straight up and down while moving but in the same position as it was. b. the factors are speed and how high it was thrown

Physics Plus
page 179 11/09/10

1a. 31.62 m/s b. 2a.43.3m/s and 25m/s b. 15.2 m/s c. -24 m/s d. 50 m/s

Physics Talk
page 177 11/09/10

Projectile is an object traveling through the air. The two coins will hit the floor at the same time. You can predict the motion of the ball using all of this knowledge. The horizontal speed will stay constant while the vertical is always accelerating.

Checking Up
page 178 11/09/10

1. Yes, they will hit the floor at the same time. 2. No, it accelerates by 9.8 m/s/s 3. 0m/s and 9.8 m/s/s

Physics To Go
page 182 11/09/10

1. 2 & 3. 4. because the bullet is extremely fast 5. because gravity still pushes it down at the same time 6. Horizontal motion doesn't effect its vertical motion because when the chair is pushed the ball still goes up and down the same. Vertical motion doesn't effect its horizontal motion because the ball being thrown up doesn't change the speed of the chair. 7. the same 8. 3.6 km/h 9a. 9 m/s b. 18 m 10a. 8.49 m/s b. 4.25 m