Work done by a Variable force.

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Presentation transcript:

Work done by a Variable force. Start up one computer for your table and open the Hooke’s Law activity under chapter 10 on the physics website. Objective(s)/SWBAT (Students will be able to): Describe Work work done ...by a constant force? ...by a variable force? Activities: Discuss work Closure: Students describe work done by a constant force and a variable force Assessment: posters Problem Set Test Keystones: 3.2.B

Work done by a Variable force. Hang the known masses on any spring that you like. Read the position for each mass. Produce a data table with force and position. Produce a graph of position vs. Force. Print one graph for each member of your group. Keystones: 3.2.B

Work done by a Variable force. Use this graph to determine the amount of work done in stretching the spring. What force did this work? Keystones: 3.2.B

Work done while hiking A 110kg hiker walks to the visitors platform at Seneca rocks. The trail is 2.5 miles long and the platform is 850 feet above the starting point. How much work is done by the hiker. Keystones: 3.2.B

Power A car that is travelling 65 mph must exert a force of 900 Newton in order to overcome friction and travel at a constant speed. What power is the engine producing? Keystones: 3.2.B