Day 21 in SCI110: Newton's Laws
- Spring 2006 Schedule
- Last time: compound motion
- Elements of Motion review
- Discussed free fall experiment
- plotted distance versus time - parabolas
- plotted the square root of distance versus time - another calculation of g, the acceleration due to gravity
- units of acceleration: m/s/s
- Compound Motion:
- Vector notion for velocity and acceleration
- Motions with Horizontal and vertical components
- Uniform Circular Motion
- Conducted projectile motion experiment
- Reminder: Quiz next time (physics)
- Today:
- Homework:
- Prepare for physics quiz (next time)
- Read Chapter 4, pp. 79-85, 88-91; QFT 2-7
- Prepare for debates (Wednesday next)
- Hand in proposals for final projects
- In the news:
- National Geographic this month: earthquakes!
- A solar eclipse is going on today!
- Data and results from Monday's experiment:
- Newton's Laws of Motion (Chp. 2: 32-38)
- Tim
and Moby's take on them
- First: law of inertia
- A body in motion tends to remain in motion and a body at rest tends to remain at rest unless acted upon by an unbalanced force.
- If your motion changes (your velocity vector changes), then you've been subjected to an "unbalanced" (or net) force.
- Second: F=ma
- Alternatively, a=F/m, so your acceleration is
- inversely proportional to your mass m, and
- directly proportional to the force F
- Third: forces are equal and opposite
- How then is motion possible?
- Only forces external to a system can accelerate an object.
- Exercises:
- Questions for thought: p. 49/1-3, 5, 6, 8-12
- Group B: 1-4, 10
- Projectile Motion lab, part II (p. 60)
Website maintained by Andy Long.
Comments appreciated.
