Section+7+chap+4

Section 7 toc

What Do You See?
page 420 5/23/11

Roller coaster with a flip and a cart almost falling off.

What Do You Think?
page 420 5/23/11

energy

Investigate
page 420 5/24/11

Part A 1a) goes straight b)circle c)tangent d)yup 2)centrifugal b)inward 5)sure b)centrifugal

PART B 1) the force is moving inward b)the more force the faster it goes 2)the more stoppers the more force needed b)so we could compare the forces needed for both c) the more mass the more force needed by your finger 3) the longer the string the more force you need to spin it at the same speed b).the speed 4) you apply force downward b)you apply more force at the bottom c)when its slow 5) more speed less force needed b) more mass more force c)larger radii more force d)steel 6a. large force 6b. small force 7) 8) 11) a large force is needed and its the centrifugal force b)the higher the speed the bigger the loop has to be

Physics Talk
page 425 5/25/11

normal force: the force acting perpendicular to the surface centripetal force: any force directed toward the center that causes an object to follow a circular path at a constant speed centripetal acceleration: the acceleration directed toward the center of a circle experienced by an object traveling in a circular path at constant speed

Checking Up
page 429 5/25/11

1. Centripetal force is required to make an object move in a circle 2. Yes, there will be centripetal acceleration 3. The track and gravity 4. Normal force 5. The mass, curve, and radius determines the amount of force that is needed

Physics To Go
page 433 5/26/11

1a.

[[image:acpbrians:kjk.jpg caption="kjk.jpg"]]
2a. The force of the wheels turning. b. 3. The force needs to be greater because the velocity is greater. 4. It will be more difficult because there is more force in the car which will require more force to turn and the ice will make the car slide. 5. M= mass V= velocity R= turn radius 6a. The speed did not change b. The velocity changed because the direction changed 8. Blue is gravity, red is cart, black is the track 9. Centripetal force is not a force itself it is a group of forces. 10.Fast Moving Roller Coaster 11. When you first go up the loop. 12.
 * || Required Centripetal Force || Force of Gravity || Normal Force ||
 * At the top of the loop ||  ||   ||   ||
 * At the bottom of the loop ||  ||   ||   ||