This discussion focuses on solving kinematics problems involving acceleration, velocity, and displacement. Key equations such as v_2 = v_1 + at and a = (v_2 - v_1)/t are utilized to derive final velocities and average accelerations in various scenarios, including an arrow striking a target and a hockey puck rebounding from a board. Participants clarify the importance of distinguishing between initial and final velocities, as well as the correct application of time intervals in calculations. The discussion emphasizes the need for careful substitution of values in equations to avoid common mistakes.
PREREQUISITESStudents studying physics, particularly those focusing on kinematics, as well as educators looking for examples of problem-solving techniques in motion analysis.
Doc Al said:The angle between the sides is not 136, but 44. (But the resulting magnitude is the same.) Draw a picture to clarify the angles involved. I assume "22 degrees to the board" means that the velocity makes a 22 degree angle with the surface of the board.
That's the angle between those velocity vectors, but it's not the angle in the triangle that defines the difference between those two vectors:Byrgg said:How is it 44? The velocities make a v shape with the board, 22 degrees to the board each way. Knowing that the board is 180 degrees, the angle between them should be 180 - (22 + 22), shouldn't it?
If someone's paying attention, about 2 seconds.Byrgg said:How long will it take to get an attachment approved, approximately?
That's OK too.Or could I just use an image hosting site, and post a link to the diagram?