Section+2+chap+3

=__//**Section 2- Newton's First Law Of Motion: Life and Death before and after seat belts**//__= toc

What Do You See?
page 266 2/14/11

Car accident the first guy is wearing a seat belt and the second guy inst and is leaving the car.

What Do You Think?
page 266 2/14/11

A strap going from both shoulders to both hips and connecting in the middle.

Investigate
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Part A
2a. he hit the book face first. 3a. he flew out the car head first for both, but the second time he came out much faster.

Part B
2a. low angle small cut in stomach 6 in higher angle bigger cut in stomach 13 in higher angle almost cut him in half15 in 3a. smaller string small push in stomach but protected pretty well bigger string protected the clay guy very good almost no push in the clay by the seat belt b. the thicker the seat belt

Physics To Go
page 274 2/15/11

1b. you move forward a little when the car accelerates c. the object in the back remain in motion even when you step on the brakes d. the seatbelt holds the person back so they do not fly forward 2. a car in neutral will keep moving, when you step on the brakes something in the car flies forward 3. the person would move forward over the curb 4. first collision- automobile strikes pole and pole exterts force that brings automobile to rest second collision- when the automobile stops, body keeps moving third collision- the body stops but the heart, the brain, and other organs keep moving 5. since there is less of an area, there would be more pressure on the body 6. Yes because seat belts can save people's lives 7a. They would be safer in an accident if they were wearing a seatbelt b. if the car crashes, you would remain in motion and fly forward 8. the body is stopped, but the picture shows the brain keeps moving 9. .8m

Active Physics Plus
page 271 2/15/11

1a. 10 N/m^2 b. 50 N/m^2 c. .66N/m^2 d. 2.5 N/m^2 2a. 17500 N/m^2 b. 35000 n/m^2