


Useful Web Links 

2. Forces of 5 N and 12 N act at right angles on a point. The magnitude of their resultant in N is
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3. The resultant of a number of concurrent forces which are in equilibrium
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4. A horizontal force of 100 N is needed to pull a sled forward. If the rope pulling the sled makes an angle of 30degrees with the horizontal, the tension in the rope (in N) must be approximately
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Net Force Problems Revisited (17 seconds) 
5. A 1.40kg "Eat at Ed's" sign is hung symmetrically between two strings. The angle between the strings is 100°. Draw a clear and meaningful triangle and use trigonometric functions to predict the tension in a single string. PSYW
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Equilibrium and Statics (23 seconds) 
6. A 50kg crate is placed on a 45° inclined plane. The coefficient of friction between the crate and the plane is 0.20. Fill in the blanks in the diagram and determine the acceleration of the crate down the plane. Clearly show your work for the acceleration calculation.
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7. A 10kg object is pulled across a rough surface. The velocitytime graph for its motion is shown at the right. Utilize Newton's second law and an understanding of vector resolution in order to fill in the blanks in the diagram below.
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Net Force Problems Revisited (17 seconds) 
8. Jack and Jill climbed up a hill which had a 30° incline. They boarded a sled, with physics in head, and tried to find their accelerashine. Assuming that the surface is frictionless and that the combined mass of Jack, Jill, and the sled is 180 kg, determine their acceleration. Utilize a freebody diagram if necessary. PSAYW
Demonstrate your understanding of acceleration by filling in the velocitytime table for the motion of Jack and Jill down the hill.
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Acceleration (12 seconds) 
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© Tom Henderson, 19961999
Last updated on 10/18/99.