Handed back RA 5.1 and went over it
Collected Inelastic Collision worksheet
Collected RA 5.2
Reviewed collisions.
Collisions Lab
Bowling ball and golf ball competition.
Friday, November 19, 2010
Tuesday, Nov 30, 2010
Collected RA 5.1
Handed out RA 5.2 due tomorrow.
Went around the room and asked what they remembered from last class.
Show parts of video dealing with boxing, railroad cars.
Demo with blowpipes and marshmallows to show that longer cannons impart more impulse (same force, longer time) than short cannons. Actually did this yesterday.
Catching and throwing on frictionless ice both give impulse. Catching and throwing is like bouncing. More impulse if bouncing occurs. But...don't know anything about the force unless you know something about the time.
Skare's demo with happy and sad balls knocking down block.
Bouncing gives greater impulse since there is a greater change in momentum. We know nothing about the force unless we know something about the time.
Showed part of video on Pelton Waterwheel
Intro to conservation of momentum: If no net external force acts on the system, then there is no change in momentum.
Conservation of Momentum has never been shown to fail. It does not apply in cases in which there is an external force (such as gravity for a falling object).
Applied Conservation of Momentum to collisions.
Two basic types of collisions:
1. Elastic (Things bounce)
2. Inelastic (Things stick)
If there is no net external force, momentum is conserved in both types of collisions.
Demos with air track for both types of collisions.
Worked inelastic collision problems on board showing problems solving strategy.
Handed out Inelastic Collisions worksheet. Students worked on it in class and handed it in. Actually ran out of time so had students do it for HW
Handed out CD chpt 5 due for the last time on Monday. It asks for pictures, if you don't draw them then I will return the paper.
Handed out RA 5.2 due tomorrow.
Went around the room and asked what they remembered from last class.
Show parts of video dealing with boxing, railroad cars.
Demo with blowpipes and marshmallows to show that longer cannons impart more impulse (same force, longer time) than short cannons. Actually did this yesterday.
Catching and throwing on frictionless ice both give impulse. Catching and throwing is like bouncing. More impulse if bouncing occurs. But...don't know anything about the force unless you know something about the time.
Skare's demo with happy and sad balls knocking down block.
Bouncing gives greater impulse since there is a greater change in momentum. We know nothing about the force unless we know something about the time.
Showed part of video on Pelton Waterwheel
Intro to conservation of momentum: If no net external force acts on the system, then there is no change in momentum.
Conservation of Momentum has never been shown to fail. It does not apply in cases in which there is an external force (such as gravity for a falling object).
Applied Conservation of Momentum to collisions.
Two basic types of collisions:
1. Elastic (Things bounce)
2. Inelastic (Things stick)
If there is no net external force, momentum is conserved in both types of collisions.
Demos with air track for both types of collisions.
Worked inelastic collision problems on board showing problems solving strategy.
Handed out Inelastic Collisions worksheet. Students worked on it in class and handed it in. Actually ran out of time so had students do it for HW
Handed out CD chpt 5 due for the last time on Monday. It asks for pictures, if you don't draw them then I will return the paper.
Monday, Nov 29, 2010
Go over Newton's 3rd Law test.
Introduction to impulse and momentum lesson
Content Objectives:
Student will be able to
. Define impulse and momentum
. Give the correct units for impulse and momentum
. Calculate impulse and momentum
. State that impulse = change in momentum
. Describe several real-life examples using impulse = change in momentum
. Explain why impulse is greater in bouncing than in sticking
Handed out RA 5.1 due Tuesday
Assigned Quia Quiz 5.1-15 Random - REQUIRED QUIZ - do by Wed and get 100% correct
Also put up full quiz with all questions.
Impulse = Fnet*time
Units of impulse = N s
Momentum = mass * velocity = inertia in motion = ooomph
Units of momentum = kg m/s
Derived Impulse = Change in momentum
Several examples of F*t for same change in momentum
Egg toss lab
Force plate demo - flex knees, lock knees
Marshmallow blow gun demo.
Introduction to impulse and momentum lesson
Content Objectives:
Student will be able to
. Define impulse and momentum
. Give the correct units for impulse and momentum
. Calculate impulse and momentum
. State that impulse = change in momentum
. Describe several real-life examples using impulse = change in momentum
. Explain why impulse is greater in bouncing than in sticking
Handed out RA 5.1 due Tuesday
Assigned Quia Quiz 5.1-15 Random - REQUIRED QUIZ - do by Wed and get 100% correct
Also put up full quiz with all questions.
Impulse = Fnet*time
Units of impulse = N s
Momentum = mass * velocity = inertia in motion = ooomph
Units of momentum = kg m/s
Derived Impulse = Change in momentum
Several examples of F*t for same change in momentum
Egg toss lab
Force plate demo - flex knees, lock knees
Marshmallow blow gun demo.
Monday, November 8, 2010
Monday, Nov 22, 2010
Go over end of chapter questions, chapter 4: Ex 17, 18, 19, 20, 24, 25, 26, 30, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 48, 49, Prob 8
Go over any questions on Problem sheets
Review for test
Go over any questions on Problem sheets
Review for test
Friday, Nov 19, 2010
Collect RA 6.1 for last time
Go over HW problems. Make sure students follow the problem solving strategy and don't try to take shortcuts by omitting steps.
Two quizzes on inclined plane problems
Did problems 2 and 4 from worksheet.
Test has been rescheduled for Tuesday
Go over HW problems. Make sure students follow the problem solving strategy and don't try to take shortcuts by omitting steps.
Two quizzes on inclined plane problems
Did problems 2 and 4 from worksheet.
Test has been rescheduled for Tuesday
Subscribe to:
Posts (Atom)