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Effects of Forces Change shapeChange shape

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Effects of Forces Change shapeChange shape

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Change of Shape

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extension Force is directly proportional to extension

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When force doubles, the extension doublesWhen force doubles, the extension doubles F α xF α x F x = constant Hooke’s Law

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Force is directly proportional to extension F1F1 x1x1 = F2F2 x2x2 m1m1 x1x1 = m2m2 x2x2

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What if we put more weights than we did? Limit of proportionality See p.23 SQ and Key PointsSee p.29 question 5

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Effects of Forces Change the state of motionChange the state of motion –Move from rest –Speed up –Slow down –Stop –Change its direction

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Balanced forces

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Balanced Forces The book stays still!

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Balanced Forces The airplane moves forwards at constant speed!

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Balanced Forces The car moves at constant speed! Drag Friction Thrust

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Unbalanced Forces The car moves from rest. The car speeds up.

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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

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Aristotle wrote that moving objects need a push or pull to stay in motion. Galileo showed that moving objects would keep moving in a straight line.

Aristotle wrote that moving objects need a push or pull to stay in motion. Galileo showed that moving objects would keep moving in a straight line.

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