Section+4+chap+4

=Section 4= toc

What Do You See?
page 382 5/8/11

There is a roller coaster and it is fun pm Jupiter but not fun on the moon

What Do You Think?
page 382 5/8/11

Gravity's direction is towards Earth. People in Australia can be upside down because of gravity

Physics Talk
page 385 5/8/11


 * gravitational field:** the gravitational influence in the space around a massive object
 * inverse-square relationship:** the relationship between the magnitude of a gravitational force and the distance from the mass. This also describes how electrostatic forces depend on the distance from an electrical charge
 * Newton's law of universal gravitation:** all bodies with mass attract all other bodies with mass; the force is proportional to the product of the two masses and gets stronger as either mass gets larger; the force decreases as the square of the distances between the two bodies increases
 * gravity:** the force of attraction between two bodies due to their mass

Checking Up
page 387 5/8/11

1. towards the center of the earth 2. when the field lines are closer together 3. It would become weaker and become 1/9th 4. 10 5. an oval

Physics To Go
page 390 5/9/111. 125 2a. 4 times less b. 9 times less c. 16 times less 3. Everyone trusts in gravity because without it everything would fly away from earth. 4. At the top of a roller coaster the GPE is the greatest and at the bottom the it is the least. 5a. The water on the outside of the earth. b. The gravitational pull of the moon effects the tides making them rise and lower. c. The moons gravitational pull is the greatest at the sides of the earth making the water come out more. 6a. Fish would have to swim in circles their whole life if gravity was not present. b. Yes, gravity holds water down and fish are in water. 7a. 1/4 b. 1/9 c. 1/16 d. 2 times 8a. 1. .125 2. 4 times less 3.9 times less 4. 16 times less 5. 6. 7.