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PICK UP JOURNAL FROM COUNTER BY DOOR AND FILL OUT TABLE OF CONTENTS Table of Contents DateEntryPag e # 9/1 0 Observations Quiz 7 Unit 2: Force and Motion 9/1 0 Force Notes8

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FORCE Objective: Students will demonstrate and illustrate forces that affect motion in everyday life

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FORCE VIDEO

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FORCES A force is a push or pull Forces give energy to objects Forces cause a change in motion (start moving, speed up, change direction, slow down, or stop)

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FORCE FORCE – is measured in units called NEWTONS (N) Examples- a force will have the letter N behind it. 12N and 135N represent forces. FORCE is measured using a spring scale. A spring scale measures the amount of force needed to move an object. 5

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To describe a force, you must know two things: Size of the force and Direction of the force

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VERY IMPORTANT INFORMATION ABOUT FORCE!!! To describe a force, you must know two things: Size or strength of the force and the Direction of the force 25N Direction of Force Size or Strength of force

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BALANCED FORCES Forces that are equal in size but opposite in direction are under balanced forces Balanced forces do not cause a change in the motion of objects

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UNBALANCED FORCES Unbalanced Forces can cause an object to change directions or to start moving

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UNBALANCED FORCES Unbalanced forces can change the motion of an object in two ways: When unbalanced forces act on an object at rest, the object will move When unbalanced forces act on a moving object, the object will change direction

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PRACTICE PROBLEMS PLEASE COPY THE PROBLEM!!!! CALCULATING NET FORCE

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PROBLEM A Net Force Unbalanced 225 N

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PROBLEM B Net Force Unbalanced 75 N

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PROBLEM C Net Force Balanced 50 N 0 N 50 N 100 N

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PROBLEM D Net Force Unbalanced 792 N 224 N 632 N 400 N 100 N900 N + + +

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PROBLEM E Net Force Unbalanced 550 N 13 N 750 N 1563 N 250 N + +

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PROBLEM F Net Force Unbalanced 987,256 N 6011 N 993,267 N

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THANK YOU! Glue your notes on page 8 Please pass down your journals!

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