Reviewed for test.
Went over problems from worksheet.
Went over end of chapter questions.
Monday, May 11, 2009
Monday, April 27, 2009
Tuesday, April 28, 2009 - Block 2
Collect RA 5.2
Show parts of video dealing with railroad cars.
Momentum Quiz
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 dropping an 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.
Students worked on and handed in Elastic Collision Worksheet.
Homework: RA 5.3, CD chapt 5
Show parts of video dealing with railroad cars.
Momentum Quiz
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 dropping an 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.
Students worked on and handed in Elastic Collision Worksheet.
Homework: RA 5.3, CD chapt 5
Monday, April 27, 2009 - Block 2
Go over Newton's 3rd Law Test
Collected, graded, and went over RA 5.1
Demo with blowpipes and marshmallows to show that longer cannons impart more impulse (same force, longer time) than short cannons.
Demo with force plate. Much larger force when lock knees. The impulse is the same but the time to stop is shorter. If the force varies, you can find the impulse by finding the area under the curve.
Rebounding increases impulse.
Demo with happy/sad balls knocking down block.
Homework: RA 5.2
Collected, graded, and went over RA 5.1
Demo with blowpipes and marshmallows to show that longer cannons impart more impulse (same force, longer time) than short cannons.
Demo with force plate. Much larger force when lock knees. The impulse is the same but the time to stop is shorter. If the force varies, you can find the impulse by finding the area under the curve.
Rebounding increases impulse.
Demo with happy/sad balls knocking down block.
Homework: RA 5.2
Friday, April 24, 2009 - Block 2
Did not have time to grade Newton's 3rd Law test so did not go over it.
Intro to Impulse and Momentum.
Impulse = Fnet * t
Units of impulse are N s
Momentum = ooomph = mass * velocity
Derived Impulse = Change in momentum
Several examples
Egg toss lab
Handed out RA 5.1. Students had 10 min in class to work on assignment - finish for homework.
Intro to Impulse and Momentum.
Impulse = Fnet * t
Units of impulse are N s
Momentum = ooomph = mass * velocity
Derived Impulse = Change in momentum
Several examples
Egg toss lab
Handed out RA 5.1. Students had 10 min in class to work on assignment - finish for homework.
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