Internal Forces and the Human Body

Complexity of the Musculoskeletal System 150

6.1 Introduction 150

6.2 Muscle Force in Motion 152

6.3 Examples from Weight Lifting 157

6.4 Moment Arm and Joint Angle 161

6.5 Multiple Muscle Involvement in Flexion of the Elbow 164

6.6 Biarticular Muscles 165

6.7 Physical Stress 169

6.8 Musculoskeletal Tissues 172

6.9 Limb-Lengthening 178

6.10 Summary 182

6.11 Problems 183

Chapter 7 Impulse and Momentum

Impulsive Forces and Crash Mechanics 194

7.1 Introduction 194

7.2 Principle of Impulse and Momentum 194

7.3 Angular Impulse and Angular Momentum 200

7.4 Elasticity of Collision: Coefficient of Restitution 207

7.5 Initial Motion 211

7.6 Summary 213

7.7 Problems 214

Chapter 8 Energy Transfers

In Pole Vaulting, Running, and Abdominal Workout 220

8.1 Introduction 220

8.2 Kinetic Energy 221

8.4 Potential Energy 227

8.5 Conservation of Mechanical Energy 230

8.6 Multibody Systems 232

8.7 Applications to Human Body Dynamics 235

8.8 Summary 246

8.9 Problems 247

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Getting Started With Dumbbells

Getting Started With Dumbbells

The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.

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