Section+4+chap+3

=Section 4- Newtons Second Law Of Motion: The Rear End Coliision= toc

What Do you See?
page 292 3/3/11

big monster truck hitting the small car, a dummie getting whiplash

What Do You Think?
page 292 3/3/11

when your head swings back or forward too quick your body is moving forward and your head is not

Investigate
page 292 3/3/11

7a. the head is swung backwards b. the head is left behind because it is and stays in rest 9. head came off

Physics Talk
page 294 3/3/11

Newton's second law of motion: if a body is acted on by an unbalanced force, it will accelerate in the direction of the unbalanced force. The acceleration will be larger for smaller masses. The acceleration can be an increase in speed, a decrease in speed, or a change in direction. whiplash: the common name for type of neck injury to muscles of the neck

Checking Up
page 297 3/3/11

1. headrest 2. the body moving forward and the head remaining still causes the head to snap backward. The neck muscles and bones of the vertebral column become damaged 3. first law- a car stopped at a red light the driver is at rest within the car second law- automobile begins to move and backseat pushes driver forwards

Physics To Go
page 299 3/3/11

1. because the car is moving and the head is flung back 2. newton's first law- the package stays in motion 3. the passengers stay in place but the bus moves forward so it feels like they are moving forwards 4. there is not headrest 5. rear-end collision because the head whips back and forth 6. headrests 7. the head rest keeps the head in place