Lesson dealing with areas of Newton's second law. Examine air resistance as a force which diminishes the net force acting. Outline and discuss how air resistance depends directly on the speed of the object in contact. Elicit how it also depends on the area in contact with the air. Use some common demonstrations. Define terminal speed and relate it to acceleration becoming zero and air resistance friction balancing the weight. Note also that the velocity becomes zero.
Assignment
e mailed home
Session Minutes
45
Minutes Student Attended
45
Lesson Comments
last assigned hw was turned in one time. and compete
Today we went over the basics of 1D motion, including distance/displacement, speed/velocity, and acceleration/deceleration. We did a few problems to practice using those formulas with the correct sign (for example, negative for deceleration).
Discuss Newton's second law dealing with force and acceleration . Discuss how forces will cause accleration. Discuss unbalanced forces acting on an object. Elicit that net force accelerates an object. Discuss that acceleration is directly proportional to net force and inversely proportional to mass. An increase in mass results in a decrease in acceleration. Elicit the formula to show that acceleration = force /mass. Present a few problems to be solved in the class.
Lab to determine speed and acceleration due to an object rolling along an inclined plane. By adjusting the height and taking time measurements, the average speed is determined and the acceleration calculated. The acceleration due to gravity in free fall is determined.
lab which will demonstrate speed and acceleration of an object starting from various distances from an end point. It will demonstrate how Galileo arrived at his conclusions. Graphs and analysis will be attached
Discuss momentum and inertia in motion. Identify momentum a property to resist change in motion. Relate that inertia is proportional to mass. Discuss the formula momentum = mass x velocity. Introduce impulse as a change in momentum which is affected by mass and/or velocity. Show how an increase in force yields an increase in velocity change, yields an acceleration which can lead to a change in momentum.
Review instantaneous speed and average speed calculations. Determine the acceleration due to gravity as 9.8 km/sec/sec. Solve a problem relating free fall instantaneous velocity, determination of average velocity and distance fallen during a period of free fall. Introduce the formula d=1/2 gt^2.
Discuss examples to help define acceleration. Determine acceleration as a rate of change of velocity per unit time.. Discuss formulas to determine rate of change of velocity and rate of change of time. Solve some determination of acceleration problems . Introduce the concept of free fall. Define free fall. Using a graph of time in seconds v instantaneous velocity for a free falling object, determine the acceleration due to gravity. Discuss the units involved.