I. Introduction to Machines Machines Force Work Mechanical Advantage

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Presentation transcript:

I. Introduction to Machines Machines Force Work Mechanical Advantage

A. Machines Machine device that makes work easier changes the size and/or direction of the exerted force

B. Force Effort Force (Fe) force applied to the machine “what you do” Resistance Force (Fr) force applied by the machine “what the machine does”

C. Work Win = Fe × de Wout = Fr × dr Work Input (Win) work done on a machine Win = Fe × de Work Output (Wout) work done by a machine Wout = Fr × dr

C. Work Fe × de = Fr × dr Win = Wout Conservation of Energy can never get more work out than you put in trade-off between force and distance Win = Wout Fe × de = Fr × dr

C. Work Win = Wout Win > Wout In an ideal machine... But in the real world… some energy is lost as friction Win > Wout

D. Mechanical Advantage Mechanical Advantage (MA) number of times a machine increases the effort force MA > 1 : force is increased MA < 1 : distance is increased MA = 1 : only direction is changed

D. Mechanical Advantage A worker applies an effort force of 20 N to open a window with a resistance force of 500 N. What is the crowbar’s MA? GIVEN: Fe = 20 N Fr = 500 N MA = ? WORK: MA = Fr ÷ Fe MA = (500 N) ÷ (20 N) MA = 25 MA Fr Fe

D. Mechanical Advantage Find the effort force needed to lift a 2000 N rock using a jack with a mechanical advantage of 10. GIVEN: Fe = ? Fr = 2000 N MA = 10 WORK: Fe = Fr ÷ MA Fe = (2000 N) ÷ (10) Fe = 200 N MA Fr Fe