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Physics Forces and Motion Ms. Goldamer Copy everything in red onto your class notes.

Physics Forces and Motion Ms. Goldamer Copy everything in red onto your class notes. Section 1 Summary. A reference point is an object that appears to stay in place. The Earths surface is a common reference point for determining motion. Section 1 Summary.

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Physics Forces and Motion Ms. Goldamer Copy everything in red onto your class notes.

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  1. PhysicsForces and MotionMs. GoldamerCopy everything in red onto your class notes.

  2. Section 1 Summary • A reference point is an object that appears to stay in place. • The Earths surface is a common reference point for determining motion.

  3. Section 1 Summary • Speed is a measure of how fast something is moving. • Average Speed = total distance/total time. • The speed at any instant is called “instantaneous speed”.

  4. Answers: • 1. 2 m/s • 2. 5km/h • 360 km/hr

  5. Summary section 1 continued • Velocity is the speed of an object in a particular motion.

  6. Velocity can change by changing speed or direction. • What’s are the 2 “resultant velocities” on page 121?

  7. Acceleration is the rate that velocity changes over time. • Average Acceleration = • Final velocity-starting velocity/time.

  8. Practice Problems • On a separate piece of paper: vf=final velocity, vi = starting velocity. • Find the average acceleration for • A)vf = 23, vs = stopped, time=36 sec. B)vf= 85, vs = 5 m/s, time = 40 sec C) vf = 29, vs =2 m/s, time = 9 seconds D) vf = 13, vs = 3 m/s, time = 2 seconds

  9. Section 2 • A force is a push or pull exerted on an object. • What does “Exerted” mean? • How do I determine the “net force”?

  10. Answer & Questions • “Exerted” means to put on to. • Net = add all forces acting on the object. • Are the forces on a soccer ball balanced or unbalanced? How do you know?

  11. Soccer Ball Answer • Unbalanced, because the ball changes speed and/or direction.

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