Inclined Planes and Work

Day 2

oneSK-15A

Objective: To examine data in order to find out how the length of an inclined plane

affects the amount of work completedCore Question: How do inclined planes affect work?

Drill: 1. Compare your homework answers with your

neighbor.2. Get an Activity Sheet from the SET. (And quiz guide)

3. Read the objective and the Scenario.

Inclined Planes and Work

Day 2

oneSK-15A

Homework Check

Lab Analysis

Inclined Planes and Work

Day 2

oneSK-15A

1. Patterns a. As the height of the incline

increased, the force applied increased.

b. As the height of the incline increased, the amount of work completed increased.

c. The length of the plane remained constant.

Inclined Planes and Work

Day 2

oneSK-15A

2. Reflecting on the Hypothesis

a. Statement of Validity

b. Statement of Hypothesis

c. Explanation w/Evidence

Inclined Planes and Work

Day 2

oneSK-15A

3. Reliable Data

a. Repeated Trials

b. Elimination of Outliers

c. Other???

Inclined Planes and Work

Day 2

oneSK-15A

How will the length of an inclined plane affect the

amount of work completed?

Inclined Planes and Work

Day 2

oneSK-15A

ScenarioYou have just finished exploring how the height of an inclined plane affects the amount of work completed. Another group of students did a different investigation. They explored how the length of an inclined plane affects the amount of work completed. Their data has been collected in the chart, “The Effect of the Length of an Inclined Plane on the Amount of Work Completed.” Figure 1 shows the set up of the class’ investigation. Note that the height of the inclined plane remains constant.

Inclined Planes and Work

Day 2

oneSK-15A

Length of Inclined

Plane (m)

Height of Inclined

Plane (m)

Force Applied

(N)

Work Completed (N-m)

0.5 0.50 5.0 2.5

1.0 0.50 2.5 2.5

1.5 0.50 1.7 2.5

2.0 0.50 1.3 2.5

2.5 0.50 1.0 2.5

The Effect of the Length of an Inclined Plane on the Amount of Work Completed

Inclined Planes and Work

Day 2

oneSK-15A

Small Group Discussion

What do you notice about the work completed? Why does this occur?

The data in the investigation above is theoretical. How would it be different in reality? Why?

Inclined Planes and Work

Day 2

oneSK-15A

Our Fair Friend

FRICTIONInput Work: The work put into the

machineOutput Work: The work the machine doesInput work is always greater than

output work due to friction.

Inclined Planes and Work

Day 2

oneSK-15A

Homework

Analysis Ditto(to be collected)