Reasoning w/FBD's

For each of the following 5 scenarios,

1. There is a set of questions to answer prior to experimentation.

2. All materials needed to physically experiment with the scenario are supplied.

   1. If you would like to extend or experiment with additional materials please do not hesitate to ask for more equipment.

3. For each of the scenarios, you may want to create FBD's to help yourself and partners to explain your observations.

4. Your sole responsibility is to leave with the following understandings:

   1. How can I use FBD's to support my arguments?

   2. When using On...By... notation, am I identifying the appropriate objects?

   3. Can I use scientific reasoning to overcome some of the deeply held beliefs that I entered the room with?

Our Labels may vary but the ON... BY ... Notation is excellent!

Scenario 1: Spring Scale Reading

1. 1. Prior to Experimenting

      1. Answer the questions: Scenario 1: Spring Scale Reading

   2. Experimenting:

      1. Create FBD's for each of the three scenarios.

         1. For each FBD, indicate the forces acting on the hanging mass and the forces acting on the support mechanism.

Scenario 2: Pulling Tension

1. Prior to Experimenting

   1. Answer the following questions: Pulling Tensions

2. Experimenting:

   1. Using the spring scales, determine the tension forces acting in each of the 'ropes'.

   2. Support your answer with the appropriate FBD's.

Scenario 3: Who's pulling whom?

A spring is extended between two carts as shown. The track is horizontal and frictionless. The carts are released from rest at the same instant.

1. PRIOR TO EXPERIMENTING:

   1. Please complete the following: Who's Pulling Whom?

2. Experimentation:

   1. Complete the action (pull the carts apart and observe the results).

   2. Create FBD's to explain what you saw.

   3. Can you use video analysis to determine the greatest acceleration?

   4. How does the acceleration of each cart vary according to its mass?

Scenario 5: Launched Marbles:

Two marbles of masses M_1 and M_2 (M_1>M_2) are moving under the action of gravity, starting from the same height as shown. The mass M_1 is given an initial velocity in the horizontal direction while M_2 is released from rest.

1. Prior to experimentation, please complete the following: Which lands first?

2. Suppose the marbles take at least 3 seconds to fall to the ground after release. Create an FBD for each of the marbles at t=1s.

3. Describe the changes in the y-velocity and y-position of each marble as they fall to the ground.