LAB ASSESSMENT - Observations and evaluations of observations
Station 1: Stubborn Inertia
A piece of “looped” paper is placed over the mouth of a flask. A coin is placed on the paper so that it is directly over the opening mouth of the flask.
With a pencil thread through the loop, quickly pull the card away. What happens? Explain using your knowledge of inertia.
Station 2: Crash Test
Place a coin so that it rests on top of the toy car. Let it roll down the ramp so that it crashes into the obstacle at the bottom of the ramp.
What happens to the car and penny? (Explain this using your knowledge of inertia and motion.)
Station 3: Fabric of Gravity
Place a marble around the perimeter but of the rectangular fabric. Place the ping pong ball at the center of the rectangular fabric. What happens? Start again, but place a golf ball in the center this time? Describe and explain why the motion happens in terms of mass and distance.
Station 4: What’s the Matter with the Objects?
Compare the mass and size of of two objects on a balance.
Which one has more mass? Which one is larger in diameter? What generalizations can you make about size and mass?
Station 5: Mass or Size?
Roll both marbles of different masses down the adjacent ramps. Which one reaches the end first, or do they both tie? Why? According to Newton’s and Galileo’s experiments, both should reach the bottom at the ramp at the same time. Explain why you got the results you did.
Station 6: True Balancing Act?
An irregular shape with lines drawn on it is found on the table. Try balancing it at the point of intersection of all three lines? What happens? Explain why this happens and identify the true plumb line.
Station 7: Meet Me in the Middle?
Motion and Center of Mass. Look at the box on the table. Using a penicl (eraser end) to push the box forward at the three points (1, 2, and 3). Describe and explain their motion keeping in mind, the concept of center of mass.
Station 8: Slow Downed!
The gravity ruler is the ruler with a taped bundle of 6 pennies. What is the minimal number of pennies is needed for lift off? Explain why 6 pennies would not work? (What 2 forces are working against it?)
Station 9: Follow the Leader?
Place two marbles in the center of the fabric. With one golf ball. gently press the golf ball into the fabric near two marbles and move it around in a small circular pattern. How do the marbles behave? Explain how this is like gravity.
Station 10/11: Which Direction?
Place a penny on the trunk of the model car (the spoiler should hold the penny in place). Roll it down from the top of the ramp. What happens to the pnny and car as it travels aroun the corner at the bottom of the ramp? Explain why the penny does not follow the car through the turn at the bottom.
Station 12: Easy Pull?
Place an iron weight on a paper plate. Loop a thin thread attached to or throught the center of the mass (weight) so that you can pull it. First, pull it slowly. What happens? Now pull it fast? What happens? Explain in terms of inertia.
Teacher’ Station: Odd Man Out!
Look at the stack of washers. With a like washer, shoot or quickly slide that washer into the pile of washers. What is your observation? Why doesn’t the washer pile move or collapse, except for the washer at the bottom of the stack?