# 3.3 Hooke’s Law. TODAY’s OBJECTIVES To learn about how stretch or compression of a spring varies with gravitational force.

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3.3 Hooke’s Law

TODAY’s OBJECTIVES To learn about how stretch or compression of a spring varies with gravitational force.

x = amount of stretching/compression F = force exerted on an object (F g, F app …)

x = amount of stretching/compression F = force exerted on an object (F g, F app …)

x = amount of stretching/compression F = force exerted on an object (F g, F app …) k = spring constant

Robert Hooke 9 First one to notice this relationship

Robert Hooke 10 If too much force is applied and an object is stretched or compressed too much, the direct proportion breaks down!

Example 1 11 F app = ?? ∆x = 20 cm = 0.20 m k = 3.2 F app = k · ∆x F app = 3.2 · 0.20 F app = 0.64 N 1.33 N/cm

Example 1 12 m = 2.5 kg ∆x = 10 cm = 0.10 m If, m = 5.0 kg ∆x = ??? F g = k · ∆x m · g = k · ∆x 2.5 · 9.8 = k · 0.10 k = 245 N/m F g = 245 · ∆x

CLASSWORK Problems: 3.3 Review Problems Page: 97 13

HOMEWORK Problems: Chapter 3 Review Questions (# 10) Page: 99 14

Chapter 3 TEST Thursday, November 14 15

Chapter 3 TEST Problems: Chapter 3 Review Questions (# 1 - 9) Page: 98 - 99 16

Laboratory Investigation 3 – 3 Another Way to Weigh 17

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