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Presentation transcript:

Presented by Kesler Science Work Created by Kesler Science – More 5E lessons at KeslerScience.com Presented by Kesler Science

Essential Questions: How can you compare situations where work is done with different amounts of force to situations where no work is done?

Quick Action – INB Template Work INB Template Cut out the Work template. Glue it to your journal along the two skinny tabs. Answer the questions. © KeslerScience.com

Work What is Work? In order for work to take place you need: a force applied to an object. that object has to move a distance in the same direction as the force being applied. Force (N) Distance (m) © KeslerScience.com

Force Distance Work What two things do we need to calculate work? Distance (m) © KeslerScience.com

W = f d What is the formula for Work? Work Work = force times distance How much work is done by a person who uses a force of 50N to move a box 10m? ? = 50N x 10m Work = 500J © KeslerScience.com

Work How can you find the distance moved or force applied by using the work formula? Force = work / distance Distance = work / force W f d © KeslerScience.com

J Work Work = force times distance J = N x m What is the unit of measurement for work? Joules Work = force times distance J = N x m © KeslerScience.com

Quick Action – INB Template © KeslerScience.com

Quick Action – Work Activity Let’s decide when work is done and when work is not done. After each example, decide if work was done. Stand up and push down on your desk. Have one student move the teacher’s chair across the room. Holding a book while walking around your desk. Lift your pencil off the floor. Pull your notebook across your desk. No Yes yes © KeslerScience.com

Work Why is no work being done in these illustrations? Force is being applied. The force has not moved the object over a distance. If the wall or the barbell moved, work would have been done? © KeslerScience.com

Work Why is work being done in these illustrations? Force is being applied. The force has moved the object over a distance. Because the objects moved over a distance work was done. © KeslerScience.com

Work How do you calculate work when using a ramp? Increasing the distance will decrease the force needed. Work done is equal in both illustrations. 100 N 10 m Work = 1000J 200 N 5 m Work = 1000J © KeslerScience.com

Quick Action – Work Activity Use the following table to determine which person did the most work. Person Force Distance Work A 10m 250J B 50N 1000J C 40N 30m D 40m 400J E 25N 60m © KeslerScience.com

Check for Understanding Can you… Compare situations where work is done with different amounts of force to situations where no work is done? Determine when work is done moving a box with and without a ramp, or standing still? Clear up any confusion and answer questions. © KeslerScience.com