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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.

• A reference point is an object that appears to stay in place.

• The Earths surface is a common

reference point for

determining motion.

• 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

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

• 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

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

• What does “Exerted” mean?

• How do I determine the “net force”?

• “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?

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