Forces and the Laws of Motion All of physics is either impossible or trivial. It is impossible until you understand it, and then it becomes trivial. --

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Presentation transcript:

Forces and the Laws of Motion All of physics is either impossible or trivial. It is impossible until you understand it, and then it becomes trivial. -- Ernest Rutherford

Changes in Motion Force- push or pull exerted on some object Represents the interaction of an object with its environment

Forces cause changes in motion

Stationary object will move

Moving objects will stop

Objects can change direction

SI Unit of Force is the Newton Newton (N) 1 N = 1 kg x 1 m/s 2 Newton is the amount of force that causes a 1 kg object to accelerate 1 m/s 2

Forces can act through contact or at a distance Contact Forces- result from physical contact between two objects Field Forces- does not involve physical contact

The presence of an object affects the space around it so that a force is exerted on any other object placed within that space. The region of influence is called a field.

Force is a vector Assume that all forces act on a point at the center of an object

If Force is a Vector then the rules for Vector addition and subtraction still apply

Diagrams help analyze the situation Step 1: Draw the object, positioning it correctly

Next Step: draw and label vector arrows representing all external forces acting on the object 5800 N N N 775 N

Originate at the Center of the object Label size of the force Make sure only the forces acting on the car are included in your diagram 5800 N N N 775 N

Review FREE BODY DIAGRAM A critical first step for solving force problems 1. Draw a simple neat diagram that isolates the object whose motion is being analyzed. 2. Draw ALL the forces that act ON the object. 3. Do NOT draw any other forces. 4. Do NOT draw forces exerted BY the object on its surroundings.