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WHY THINGS MOVE AS THEY DO

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WHY THINGS MOVE AS THEY DO

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    1. CHAPTER 4 WHY THINGS MOVE AS THEY DO

    2. 4.1 WHY THINGS ACCELERATE

    4. NEWTON’S THIRD LAW: (Action-Reaction) When a body exerts a force on a second body, the second body exerts an equally strong force on the first body, directed opposite to the first force Examples: Apple and Earth: Earth exerts force on apple ? apple exerts force on Earth Earth's large mass ? Earth's acceleration very small

    5. Balanced force: If more then one force acting ? effects add ?Forces add ? “Net force” Balanced force ? Net Force = 0

    6. If acceleration ? there must be force A force is a push or pull upon an object resulting from the object's interaction with another object. kinds of forces: push, pull, shove, kick, tap friction, air resistance gravity electric magnetic

    9. NEWTON’S SECOND LAW: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

    15. A rightward force is applied to a 6-kg object to move it across a rough surface at constant velocity. The object encounters 15 N of frictional force. Use the diagram to determine the gravitational force, normal force, net force, and applied force. (Neglect air resistance.)

    16. A ball is rolling along the floor. It is rolling toward the east, and slowing down as it rolls. As the ball rolls, (a) the net force on it is toward the west. (b) its velocity is toward the west. (c) both of the above. (d) the net force on it is toward the east. (e) the net force on it is zero.

    17. A girl lifts a ball by means of a string attached to the ball. The string exerts a 30 newton force on the ball. The ball weighs 20 newtons and has a mass of 2 kilograms. The acceleration of the ball is (a) 15 m/s2. (b) 10 m/s2. (c) 25m/s2. (d) 5 m/s2. (e) zero.

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