Effects of Forces Change shapeChange shape. Effects of Forces Change shapeChange shape

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Transcript of Effects of Forces Change shapeChange shape. Effects of Forces Change shapeChange shape

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Effects of Forces Change shapeChange shape Slide 2 Effects of Forces Change shapeChange shape Slide 3 Change of Shape Slide 4 extension Force is directly proportional to extension Slide 5 When force doubles, the extension doublesWhen force doubles, the extension doubles F xF x F x = constant Hookes Law Slide 6 Force is directly proportional to extension F1F1 x1x1 = F2F2 x2x2 m1m1 x1x1 = m2m2 x2x2 Slide 7 What if we put more weights than we did? Limit of proportionality See p.23 SQ and Key PointsSee p.29 question 5 Slide 8 Effects of Forces Change the state of motionChange the state of motion Move from rest Speed up Slow down Stop Change its direction Slide 9 Balanced forces Slide 10 Balanced Forces The book stays still! Slide 11 Balanced Forces The airplane moves forwards at constant speed! Slide 12 Balanced Forces The car moves at constant speed! Drag Friction Thrust Slide 13 Unbalanced Forces The car moves from rest. The car speeds up. Slide 14 Unbalanced Forces The car slows down to stop. The car slows down. See p.25 SQ and Key PointsSee p.27 SQ and Key Points