physics forces and motion ms goldamer copy everything in red onto your class notes
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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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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.
slide6

Velocity can change by changing speed or direction.

  • What’s are the 2 “resultant velocities” on page 121?
slide9

Acceleration is the rate that velocity changes over time.

  • Average Acceleration =
  • Final velocity-starting velocity/time.
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.
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