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- 1. The Astronomy Picture of the Day
- 2. Force, Acceleration, & Interaction
- 3. Outline • Acceleration • Newton’s Second Law of Motion • Action & Reaction: Newton’s Third Law of Motion
- 4. Acceleration • The acceleration of an object is defined as its change in velocity divided by the time taken to change it. Mathematically: Change in velocity Acceleration = Change in time or using symbols a= ∆v ∆t
- 5. Views of a car in uniform motion & accelerating
- 6. Newton’s Second Law of Motion (Two equivalent statements) I. The force (F) acting on an object equals the product of its acceleration (a) & its mass (m). Mathematically F = m×a II. The amount of acceleration (a) that a body will experience is equal to the force (F) applied divided by the body’s mass (m): a = F/m
- 7. A loaded cart will not accelerate as easily as an empty cart
- 8. Newton’s Third Law of Motion (law of action-reaction) • When two bodies interact, they create equal & opposite forces on each other.
- 9. Newton’s third law of motion: (A) When X pushes on Y, an equal push is given to X by Y. (B) When X pushes on a much heavier person Z, an equal & opposite push is given to each, but Z moves off at a smaller speed
- 10. A hammer thrower feels an equal & opposite force matching the centripetal force on the swinging hammer
- 11. Questions for in-class discussion

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