P 251

Force

Activity 1-1: Introduction to Force

Procedure:

1. Place one end of a rubber band around the vertical rod on your table.

2. Stretch the rubber band to a length of 10cm beyond its unstretched length, L0.

[pic]

3. Place two rubber bands around the rod and stretch them together a length of 10cm

Question 1-1: How does the combined force of two rubber bands compare to the force of just one rubber band?

1. Repeat with 3, 4 5 rubber bands.

Activity 1-2: Measuring Force with a Force Probe

Open file L03A1-2a (Measuring Force.ds)

Procedure:

Note: The Force Probe is attached to a cart.

1. Zero the Force Probe. (With nothing attached to the Probe press "Start" on the control panel and observe the force. If it
*…show more content…*

5. Sketch the resulting graphs below or (Print and attach). If using a Printed graph be sure to label it with the Activity Number,

[pic]

Observation 2-1: The direction (push/pull) of the force exerted on the Force Probe hook determines whether the force is positive or negative. Complete the table below.

[pic]

Question 2-1: Which variable, velocity or acceleration, appears to be mathematically related to force?

____________

Question 2-2: Does the variable you selected in Question 2-1 appear to be directly or inversely proportional to the force? Explain your answer.

Keep file L03A2-1(Motion and Force.ds) open for Activity 2-2 and 2-3

Activity 2-2: Speeding Up Again

Prediction 2-2:

The force graph shown below indicates a constant positive force exerted on a cart. Assuming that the cart is initially at rest sketch the corresponding velocity and acceleration graphs.

[pic]

Procedure:

1. Zero the Force Probe attached to the cart.

2. Assemble the cart with attached Force Probe, motion detector, pulley and mass hanger as shown below.

[pic]

3. Attach one end of the string to the mass hanger and the other end to the Force Probe hook. Place a 20g (0.02kg) mass on the mass hanger.

4. Move the cart as close to the motion detector as possible (>0.5m).

5. Click "Start" and release the cart. Stop the cart before it reaches the pulley.

6. Sketch (or Print and attach) the resulting graphs below.

[pic]

7. Select the

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