09Newton1and2

# 09Newton1and2 - st nd 09 Newton's 1 and 2 laws Issues Is a...

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09 Newton's 1 st and 2 nd laws Issues: Is a force needed to produce uniform motion? What happens to motion if a constant force is applied? Demonstration

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Newton's 2 nd law observations from experiment: more force → greater acceleration more mass → lesser acceleration acceleration is in the direction of the net force Net force vector sum! follow up: Workbook exercises 4.9-11, page 4-3 a = F net m = 1 m i F i
Three forces act on an object. In which direction does the object accelerate? follow up: workbook exercises 4.14-17, page 4-4

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Newton's 1 st law Is a force needed to produce uniform motion? no acceleration could mean no velocity (static equilibrium) OR constant velocity (uniform motion) follow up: workbook exercise 4.20, page 4-5 i F = 0 a = 0
inertial/non- inertial reference frames inertial: non-accelerating how can you tell? Newton's Laws obeyed with no unexpected forces

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09Newton1and2 - st nd 09 Newton's 1 and 2 laws Issues Is a...

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