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Transcript
Newton’s nd 2 Law If balanced forces means no acceleration, unbalanced forces means acceleration A net force causes a mass to accelerate. Relationship between net force and acceleration Fnet a Relationship between mass and acceleration 1 m a Fnet = ma Net Force = mass x acceleration Solving Problems 1. 2. 3. Identify the forces acting on the object. Determine the net force or an expression for it. nd Apply Newton’s 2 Law. Friction A force between two surfaces. Parallel to the surfaces Acts in a direction to oppose motion Friction cont’d Directly proportional to the force pressing the surfaces together (normal force) Proportional to the type of surfaces (coefficient of friction) Ff=mFn Friction = (coefficient of friction) x (normal force) Two kinds of friction Static friction (ms)object is not moving Sliding (kinetic) friction (mk)-object is moving ms>mk
