Bk+1+2.1

Chapter 2 Force I. Nature of force A. Force- a push or pull exerted on an object 1. any thing that moves is a push or pull. 2. describe by how long or direction 3Push- kick a soccer ball, swing, car, baby crawling, pebble. 4. pull, close the door, tug of war B. unbalanced forces. 1.when 2 forces act in the same direction they add together. 2. The head of the arrow shows the direction of force 3. the wider the arrow shows greater force 4. When two forces act in opposite direction they combine by subtraction 5. net force- overall force on an object after all the forces are added together 6. net forces acting on an object- the force is unbalanced 7. can cause an object to i. start moving ii. stop moving iii. change direction 8. will cause an object to accelerate 9. unbalanced force acting on an object will change the objects motion C Balanced forces 1. Equal forces acting on 1 object in opposite directions are balanced forces 2. Will NOT change the objects direction 3. Add equal forces in opposite direction, net force = 0

quiz 2.1

Un balanced Balance Same - net force - net force -Push or pull not = 0 = 0 - have direction -change an - do not change objects motion objects direction

2. two forces acting in opposite directions, combining by subtraction. the net force acts in the same direction of the greater force 3. the SI unit of force 4. push or pull 5.can change objects motion 6.will not change an objects motion 7. sum of all the forces acting on an object