• QUESTIONS BEFORE LECTURE 7

now think about these

• State Newton's First Law. Where did he get it? What concept does it introduce?
• State Newton's Second Law. Where did he get it? What does it contribute to our knowledge of force?
• State Newton's Third Law. Where did he get it? What deep property of forces is it stating?
• How does F=ma come from the general definition that force is the rate of change of momentum?
• Give an example where mass does change.
• Why is the mass in Newton's laws called inertial mass?
• How is the second law a causal relation?
• What is meant by initial conditions?
• How does the second law imply determinism?
• In a collision, momentum is conserved. How is that statement equivalent to the third law?
• Give an example of a reaction force which is always there but we don't think about it.
• Give three examples of force in familiar activities such as sports.
• Mechanics is the branch of physics which includes kinematics plus dynamics. What distinguishes dynamics from kinematics?