Index of Refraction

Honors Physics conducted a lab investigation that focused on the impulse-momentum theorem. The impulse (FΔt) an object experiences is equal to the object’s change in momentum (Δp). A force sensor and motion detector was used, which allowed measurements of force, time and velocity to be taken and used to check how momentum change corresponded to the impulse delivered by an elastic material. Groups got some choice as to the type of elastic material used and it was quickly evident that stiff materials delivered a greater impulse to the carts than did looser materials (given the same push to the cart). We will go over the lab in class tomorrow and begin our discussion of conservation of momentum.

Physical Science B reviewed their pressure/depth lab and then went over the homework problems that had tasked them to use the pressure formula that they later derived from the lab activity. Folks seem to have done a good job with these problems – keep in mind which variables are constants, which information (such as density) that is given in a problem can be carried to other problems, and which direction you choose (up or down) to be positive/negative. Students then began to examine the concept of buoyancy, Archimedes’ Principle and the nature of buoyant force. The role of the buoyant force in promoting floating or sinking was discussed and the link between density and the magnitude of the buoyant force (and weight of the object) was investigated. Physical Science E also went over their pressure/depth problems and moved through the concept of buoyancy.

Physics F and G worked on correcting their work/energy exams. Grades were a bit low on this test across the board, so make sure to take care with your corrections that you understand your mistakes. The midterm and final are both cumulative, so you will definitely see this information again.

Homework

Honors Physics: Complete lab write up
Physical Science B and E: None
Physics F and G: Complete test corrections