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. - PowerPoint PPT Presentation

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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### PhysicsForces and MotionMs. GoldamerCopy 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
• 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”.
• 1. 2 m/s
• 2. 5km/h
• 360 km/hr
Summary section 1 continued
• Velocity is the speed of an object in a particular motion.

Velocity can change by changing speed or direction.

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

Acceleration is the rate that velocity changes over time.

• Average Acceleration =
• Final velocity-starting velocity/time.
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
• A force is a push or pull exerted on an object.
• What does “Exerted” mean?
• How do I determine the “net force”?