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## Forces and Free Body Diagrams

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**All members of your group must have the same answer on your**whiteboard to earn points for a question. Let’s Play!**Friction & Springs**Forces & FBD’s Mass & Weight Equilibrium & Vectors Inertia Newton’s 2nd and 3rd Laws • 100 • 100 • 100 • 100 • 100 • 100 200 200 200 200 200 200 300 300 300 300 300 300 400 400 400 400 400 400 500 500 500 500 500 500**This is a support force which points perpendicular to**surfaces.**Ff**Fn Fg**This is the FBD of a hockey puck sliding across the ice**(frictionless, no air resistance).**Fn**Fg**Fp**Fp Fg**This is the mass of an object that has a weight of 981 N on**Earth.**A 2kg object has this weight on the Moon.**(g = 1.6 m/s2)**An object is 30N on Earth. What is its weight on Jupiter?**(g = 26 m/s2)**This line represents the coefficient of static friction.**B Friction Force (N) A Normal Force (N)**What is line B? (because static friction is ALWAYS greater**than kinetic)**A spring has an equilibrium length of 5 cm, and is stretched**to 7.5 cm. This is the displacement (∆x).**A spring has a constant of 100 N/m. If a 5kg mass is hung**on it, then it will stretch this far from equilibrium.**Daily**Double!**We are OPEN**If the sign has a mass of 50 kg, this is the tension is each cable.**The resultant vector has this magnitude and direction.**30N 40N