Force and Motion Essay

1094 Words Mar 10th, 2016 5 Pages
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
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12. Pull the Force Probe to stretch the rubber bands to stretch the rubber bands 20cm.

Record the force in Newtons. _______N

13. Repeat Steps 12-14 with 3 and 4 rubber bands.

14. Record all measurements in Data Table 2.
[pic]

Question 1-2: Use Data Table 1. a) Is the ratio of force (F) to length (L) approximately constant? _______

b) Is the force (F) directly proportional to the distance the rubber band is stretched (L)? ________

c) Is the force exerted by the rubber band in the same or opposite direction as the direction the rubber band is stretched? _____________

The force exerted by a stretched rubber band or spring can be expressed as shown below?

F = -kL…equation 1-1 (elastic force law or Hooke’s Law)
Where:
L = the distance stretched beyond its equilibrium length
K= elastic force constant

d) What are the SI units of the elastic force constant, k? _______

Question 1-3: Use Data Table 2. e) Is the force with four rubber bands twice the force with two rubber bands? _________

f) Is the force directly proportional to the number of rubber bands? ________

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

Activity 2-1: Pushing and pulling a cart

Open file L03A2-1(Motion and Force.ds)
Procedure:
1. Place the cart with Force Probe attached on the track as shown below.

[pic]

2. Zero the Force Probe.

3. Grasp the Force Probe hook.

4. Click "Start"

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