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The Bird on a Wire problem as a demonstration with the rope and weight
Hang a 5 kg mass from a pair of ropes that make a 30° angle with the horizontal. How much tension is in each rope? What if the angle is reduced to 10°? What about 1°?
A 30 N sign is supported by a horizontal cable and a cable that makes a 50° angle with the horizontal. How much tension is in each cable?
Tuesday, December 12
Forces on inclined planes
Rotation of 2-D axis to match plane surface. Description of forces that act on objects in equilibrium and dynamic cases on inclined planes
Wednesday, December 13
P. 170, 30-34 due
Go over problems in class
Thurday, December 14 - short due to 2 hour delay
Friction on inclined planes
Intro. to Inclined Plane Lab
Friday, December 15
P. 170, 35-38 due
Hand in problems
Work on inclined plane lab
Monday, December 18
1-D projectiles
Simple monkey gun demonstration
Finding time is the key to solving projectile problems
A toy car rolls off our 0.95 m tall lab desk at a speed of 3.0 m/s. Where does it hit the ground?
How high is a cliff if a rock that rolls off the cliff hits at a velocity of 22 m/s at an angle of 15° from the vertical?
Tuesday, December 19
P. 170, 39-41 and 45 due
Go over problems together
Wednesday, December 21
Friction on Inclined Plane lab due
Qualitative type 2 projectile example
Thursday, December 22
Work on problems
Tuesday, January 2
Type 2 projectile example problems
Wednesday, January 3
Intro. to Projectile Lab
Thursday, January 4
Projectile Lab
Friday, January 5 - No School (too cold or whatever)
Monday, January 8
Projectile problems due (put solutions on the board)
Tuesday, January 9
Definining rotational speed as the ratio of circumference to period
Defining centripetal acceleration
Defining centripetal force
Know that centripetal force is always provided by some action force
Tension force if a ball whirled on a string
Friction force for a car going around a corner
Gravitational force for orbital motion
Electrical force for electron motion around a nucleus
Wednesday, January 10
Work on projectiles lab
Work on circular motion problems
Work on Chapter 7 Review
Thursday, January 11
P. 172, 49-53 due
Go over problems on the board.
Continue working on Chapter 7 Review and Projectiles Lab
Friday, January 12
Projectiles Lab Due
Go over problems on the board.
Continue working on Chapter 7 Review and Projectiles Lab
Monday, January 15 - No School - Teacher Inservice
Tuesday, January 16 - no class 7th (early dismissal)
Chapter 7 Review due
Go over problems on the board.
Go over issues with the inclined plane and projectiles lab