Name: ____________

Date: _________________

Teacher: ________________

______Period

Angling for Access
Problem: How does...
Analyze and Conclude:
1.

What is the difference between ideal mechanical advantage and actual
mechanical advantage? Shoul...
Name: ____________

Date: _________________

Teacher: ________________

Using the results of the lab, Angling for Access, ...
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Angling for Access, with examples 2013

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Angling for Access, with examples 2013

  1. 1. Name: ____________ Date: _________________ Teacher: ________________ ______Period Angling for Access Problem: How does the incline (angle) of a a ramp affect the force it takes to move an object up a ramp? Independent Variable: the incline (angle) of a a ramp Dependent Variable: the force it takes to move an object up a ramp Choose one! Hypothesis: If the incline (angle) of a a ramp is (steep or less steep) , then it will take (more force or less force) to move an object up a ramp. Choose one! Materials: • roller Length of Incline • ramp • spring scale • meter stick and ruler Angle of Incline Height of Incline Procedure: 1. 2. 3. 4. 5. Find the output force (weight of the roller). Use Newtons. Set the ramp to the correct angle of inclination. Measure the height of the incline and the length of the incline. Attach the roller to the spring scale. Pull the roller up the inclined plane using the spring scale. The spring scale must be parallel to the inclined plane. Measure the force it takes for the roller to be pulled up to the point the inclined plane crosses the protractor. Data Table: Angle of Inclination Length of Incline (cm) Height of Incline (cm) Input Force (N) (needed to pull the roller up ramp) Output Force (N) (weight of roller) Ideal Mechanical Advantage Length of Incline Height of Incline Actual Mechanical Advantage Output force Input force 15° 42 cm 10.5 cm .5 N 2.1 N Ex. 42 ÷ 10.5 = Ex. 2.1 ÷ .5 = 25° 38 cm 16 cm .9 N 2.1 N 40° 41 cm 26 cm 1.4 N 2.1 N
  2. 2. Analyze and Conclude: 1. What is the difference between ideal mechanical advantage and actual mechanical advantage? Should have been completed in class! 2. What happens to the ideal mechanical advantage as the incline becomes steeper? 3. How did the ideal mechanical advantage and actual mechanical advantage compare each time you repeated the experiment? 4. If Work = Force x Distance and the height of the incline is 10 cm, does the angle of incline of the ramp affect the amount of work needed to move the roller up the ramp? Distance Angle of Inclination Height of Incline (cm) 15° 10 cm 39 cm .5 N 25° 10 cm 10 cm The unit for WORK is JOULES (J). 24 cm .9 N 40° 5. Length of Incline (cm) Input Force (N) (needed to pull the roller up ramp) 16 cm 1.4 N W=FxD Ex. Work = .5N × 39 cm Explain your answer in complete sentences. _______________________ __________________________________________________________ __________________________________________________________ __ 6. Think about a wheelchair ramp. If we were building a wheelchair ramp at our school, which of these three ramps would you recommend building and why? __________________________________________________________
  3. 3. Name: ____________ Date: _________________ Teacher: ________________ Using the results of the lab, Angling for Access, apply what you have learned to the following question. Why are wheelchair ramps a longer distance than the stairs? Are architects just being thoughtless when they design long, winding wheelchair ramps? Explain your answer in a paragraph using complete thoughts and sentences. ______Period

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