Tuesday Nov 16, 2010

Stamped homework, RA 4.4.
Went around room asking what students learned from Friday's class. Wrote answers on board.
Went over worksheet as a review of Monday's demos.
Collected RA 4.4 and any CD 6.

Showed clips from Independence Day video. Physics is everywhere...except Hollywood. Hollywood does not understand Newton's 3rd Law. Showed results of calculations for reaction force.

Suppose you have a jar of flies on an electronic balance and all the flies are sitting on the bottom. How would the scale reading change if the files took off and few around the jar. Referred to finger in water demo - the scale reading would not change.

Demo with flying saucer on force plate - same reading when it is resting on plate as when it is hovering above it.

Read Horse Sense.

Showed that it is not possible to apply a force of 200 N to a piece of paper held in front of you. We estimated the mass, time, distance and calculated the acceleration and force - much less than 1 N.

Go over kicking football problem.

Applications of Newton's Laws Worksheet. Work problem 3 on front after giving students a chance to think about it. Students did a similar problem but with different masses for the blocks.

Applying Newton's Laws Worksheet. Assigned problems 3,8,9,14,24