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Chapter 5

Chapter 5. Physics A First Course. Energy and Systems. Energy and Systems Forces in Equilibrium. 5.1 The Force Vector 5.2 Forces and Equilibrium 5.3 Friction 5.4 Torque and Rotational Equilibrium. Key Question: What can we say about forces when nothing is moving?.

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Chapter 5

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  1. Chapter 5 Physics A First Course Energy and Systems

  2. Energy and SystemsForces in Equilibrium • 5.1 The Force Vector • 5.2 Forces and Equilibrium • 5.3 Friction • 5.4 Torque and Rotational Equilibrium

  3. Key Question: What can we say about forces when nothing is moving? 5A Investigation: Equilibrium and Forces *Students read text section 5.1 AFTER Investigation 5A

  4. 5A Investigation Topics • Use spring scales. • Make an object in equilibrium. • Measure forces on an object that is in equilibrium. • Draw free-body diagrams. • Measure the force of gravity. • Distinguish between weight and mass.

  5. scalar magnitude vector component free-body diagram Draw vectors to scale to represent a quantity's magnitude and direction. Solve vector problems. Find a vector's components. Chapter 5.1 Objectives and Vocabulary

  6. 5.1 Pythagorean Theory side b a2 + b2 = c2 side a hypotenuse, side c

  7. equilibrium normal force resultant Hooke's lab spring constant Explain what it means to say an object is in equilibrium. Use free-body diagrams to find unknown forces. Explain how springs exert forces. Add force vectors. Chapter 5.2 Objectives and Vocabulary

  8. Key Question: How do we account for friction? 5B Investigation: Friction *Students read text section 5.3 AFTER Investigation 5B

  9. 5B Investigation Topics • Measure kinetic energy of a system. • Determine the force of friction from experimental data. • Compare friction in a car to friction in a sled. • Use Newton's second law to calculate force of friction in a rolling car. • Compare the strength of sliding friction to that of rolling friction. • Determine how the force of friction varies with speed.

  10. friction sliding friction static friction lubricant Distinguish between sliding and static friction. Explain the cause of friction. Discuss reasons to increase or decrease friction. Chapter 5.3 Objectives and Vocabulary

  11. torque rotate axis of rotation line of action lever arm rotational equilibrium Explain how torque is created. Calculate the torque on an object. Define rotational equilibrium. Chapter 5.4 Objectives and Vocabulary

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