Tp1-Force notes - Horizontal(components...

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Technical Physics 1 Force Force What is force? Any push or pull that tends to cause a change in motion measured in Newtons (N) or pounds (lbs) 1 N = 0.225 lbs examples of force gravity (weight) magnetism electricity tension or compression Newton’s Laws of Motion 1st Law - Law of Inertia An objects motion will remain constant as long as the forces are balanced. 2nd Law - F = ma The net force on an object will cause it to accelerate inversely proportional to its mass 3rd Law - Action - Reaction For every action there is an equal but opposite reaction Equilibrium Forces are balanced (1st law) The net force (resultant force) is 0 There is no change in motion a = 0 v is constant Friction Friction is dependant on 2 factors, the roughness of the surfaces (coefficient of friction) in contact and the force pushing the surfaces together (normal force)
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Unformatted text preview: Horizontal(components) Horizontal(equations) Incline(components) Incline(equations) 5 steps to problem solving 1. What is being asked for ? 2. What is given ? 3. What facts (formula) relate what is asked with what is given. MAKE SKETCH ! 4. Substitute 5. Calculate – CHECK THE ANSWER ! – Does it answer the question ? – Does it make sense ? – Is there a need for rounding ? Methods of problem solving – For 3 forces – sketch a free-body diagram – draw a force triangle – use trigonometry – if right triangle – sin, cos, tan – if not – law of sines – law of cosines – OR Create a scale drawing Methods of Problem solving – More than 3 forces – sketch a free body diagram – break forces into components if necessary – write equations for Σ F x = 0 and Σ F y = 0 – include friction if needed F = μ N...
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Tp1-Force notes - Horizontal(components...

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