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.
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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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5. Sketch the resulting graphs below or (Print and attach). If using a Printed graph be sure to label it with the Activity Number,
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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.
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Question 2-1: Which variable, velocity or acceleration, appears to be mathematically related to force?
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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.
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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.
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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.
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7. Select the
12. Place the magnet on the scale to measure the mass of the object. Record the mass in Data Table 5.
On a smooth surface, stretch the slinky out between you and your partner, to a length of about four meters.(Caution- Do not overstretch the slinky)
Hold one ball beside the top of the meter stick with the ZERO end touching the table.
First, we will set up the force table. The table comes in three separate pieces the base, stand and table once we connect and fasten all three parts we must use a circular level to make sure the table is balanced. If the force table isn’t balanced then we must adjust the base’s feet to the appropriate levels on each leg till the bubble on the level is centered. We must then assign where the positive & negative x, y axis are on the force table as a point of reference and label them with tape .Then for part I we must apply 1.96 N in the positive x – direction, and 2.94 N in the positive y-direction then we must balance the two with a third force and record the magnitude and direction of it and a draw a diagram showing all three forces. Part II
A) 6.0 m, 26.0 m B) 26.0 m, 4.0 m C) 26.0 m, 26.0 m D) 4.0 m, 4.0 m
· I set up the apparatus as shown in the diagram. I then placed a
cinch’s ring. You will then loop the latigo up through another circle ring near the top of the
2. No, the forces went in equal and opposite directions just as the rubber band and string
3. What happens to the total force as the muscle length is increased from 50mm to 100 mm?
9. Two tug boats pull a barge directly against the current of a river. The two tow ropes from the tugs are at an angle of 37o to each other; the forces exerted by the tugs along the ropes are both 4200 N. If the current produces a force of 45 N, what is the force with which the barge is pulled forward?
Say you had an object that weighed 100 pounds and you had another object weighing 300 pounds. The object that weighed 300 pounds would would have a greater gravitational force, then the 100 pound object. Knowing this it proves that my hypothesis was right that the force (N) depend on the mass (kg) of the object.
Measure the length of the string from the ring stand to center of mass of the stopper. It should be around 10cm. Record this length in the data table.
The magnitude of the forces exerted in the horizontal and vertical directions can be calculated using trigonometry. The total magnitude of the force multiplied by the cosine of its angle with the horizon will calculate the horizontal force. Conversely, the total magnitude of the force multiplied by the sine of its angle with the horizon will calculate the vertical force.
Explanation: This all happens because of the formula, Force = Mass X Acceleration. So physically when extra mass is added, the force will increase (e.g. 20 N = 2/m^2 x 10 Kg > 10 N = 2/m^2 x 5 Kg)
Following tables and graphs show the result of the experiment. The tables will demonstrate the experimental and theoretical deflection for each case. The graphs will show the relationship between the load applied and deflection, in addition to compare the experimental deflection and theoretical deflection.