Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

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Science in Focus: Force and Motion
About the Workshops
1. Making an Impact
2. Drag Races
3. When Rubber Meets the Road
5. Keep on Rolling
6. Force Against Force
7. The Lure of Magnetism
Supplemental Resource List

Workshop 3: When Rubber Meets the Road

Web Highlights

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Workshop 3's Featured Classroom

Armstrong School, Westborough, Massachusetts, Grade 5,
Teacher: Barbara Mitchell

Answer to Workshop 3's Getting Ready
"Does Our Weight Change in a Moving Elevator?"

How does your weight change in a moving elevator?

When the elevator is at rest or moving at a constant speed between floors, the forces are balanced and you will read your weight, in our example 300 Newtons or about 136 pounds. As the elevator accelerates upward you can feel an extra force as the floor of the cab pushes to get you moving. While you are accelerating, to the constant speed between floors, the weight you feel and read on the scale is higher, lets say 310 Newtons. As you slow down to a stop you can feel that your body due to its inertia tends to keep moving, you feel lighter and the scale reading is less perhaps about 290 Newtons.

These effects you feel are similar to your experiences in a car as you accelerate, cruise at constant speed or brake for a stop.



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