1 Unit I : Work, Power & Energy
2 Energy Unit: Worksheet 1 Use pie charts to analyze the energy changes in each situation given. • Designate your choice of system with a dotted line, • Carefully label the pies to correspond with the positions of the objects given. (A, B, C, etc.) • The pies should be accurately divided and labeled with the energy storage mechanisms involved. 1. A ball is held above the ground, and then is dropped so it falls straight down. (Restrict your analysis to the ball moving in the air, BEFORE it hits the ground.) 2. A wind-up toy is wound up, then "walks" across a table and comes to a stop. 3. A baseball is thrown up in the air and then falls back down. Place velocity vectors beside each image of the baseball in the drawing, and do a pie chart for each position. 4. A ball rolls to a stop on the floor.
3 5. A superball is dropped and bounces up and down. Do a pie chart for each position of the ball shown. Why does the ball not bounce as high each time? Where did the energy "go"? 6. An object rests on a coiled spring, and is then launched upwards. 7. A piece of clay is dropped to the floor.
4 Hooke’s Law Pre-Lab Questions Purpose of the experiment: To determine the relationship between an applied force to a spring and the displacement of the spring. 1)List possible independent variables that you think might affect the stretch of the spring (form hypothesizes). List as many as you can think of. 2)For each independent variable listed in #1, describe how you can change and/or measure that variable. 3)Can you now eliminate any of the variables in #1 which would not be possible to test due to equipment/lab limitations? 4)For each independent variable listed in #1, describe which factors would need to be kept constant? 5)What equipment will be needed to conduct this experiment?
Purpose: To mathematically and graphically determine the relationship between an applied force to a spring and the displacement of the spring. Set-up: attach the spring to a ring stand. Add masses to the hanger and measure the length the spring elongates from it’s rest position. Calculate the force from the hanging masses (including the hanger)(remember that the mass needs to be in Kg). Plot the length of stretch in meters (x-axis) vs. Force in Newtons (y-axis). Mass (kg) Force (N) Length of stretch (m) 0 0 0 F = 9.8 (mass) Length of stretch is ALWAYS from the initial spot Initial spot Length of stretch Stretch after just the hanger Length of stretch Stretch after hanger +1 mass
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