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# Download Force and Newton`s Laws

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Transcript

Newton’s Laws of Motion Forces Any push or pull -may change speed or direction Net Force: Total force felt by an object. Balanced forces: no change in motion Unbalanced forces: acceleration occurs Newton’s First law of motion: (Law of Inertia) An object in motion tends to stay in motion; an object at rest tends to stay at rest, unless acted on by an outside force. “An object will remain at rest or move with constant velocity until it is acted upon by a net force.” Inertia: A resistance to change in motion (a.k.a. Momentum) Friction: A force caused by two surfaces rubbing together. Usually opposes motion. Types: Static-resistance to start moving when at rest Sliding-friction between a moving object and the surface Rolling-takes place at the contact point of a wheel and the surface it is on. Fluid-friction: acting on the front of an object moving through either a gas or liquid. Lubricant: A slippery substance used to reduce friction. Newton’s Second Law of motion: The acceleration of an object of a certain mass is determined by the size of the force acting and the direction in which it acts. Accleration NetForce or, Fnet=ma Mass Momentum=Mass X Velocity A change in momentum is dependent on the amount of time the force acts on the object: F x t=mv2-mv1 Normal Force-a force acting at a right angle to the surface. Gravity is a normal force Terminal Velocity: Greatest speed an object can fall due to air resistance. Forces are balanced. Circular Motion: Constant Acceleration due to Centripetal Force, (Centripetaltoward the center-->a) and a force tangent to the circle (in the direction of v). Newton’s Third Law of motion: For every action there’s an equal and opposite reaction. Law of Conservation of Momentum In a closed system, Momentum can be transferred from one object to another, but cannot change in total amount.