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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

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


Section 1 summary
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 summary1
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”.


Answers
Answers:

  • 1. 2 m/s

  • 2. 5km/h

  • 360 km/hr


Summary section 1 continued
Summary section 1 continued

  • Velocity is the speed of an object in a particular motion.


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


Practice problems
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


Section 2
Section 2

  • A force is a push or pull exerted on an object.

  • What does “Exerted” mean?

  • How do I determine the “net force”?


Answer questions
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?


Soccer ball answer
Soccer Ball Answer

  • Unbalanced, because the ball changes speed and/or direction.