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# 12C Forces Terms Pt2

What is inertia? Property of matter that causes objects to resist changes in motion. Proportional to mass.
What is Newton's first law? If the net force acting on an object is zero, the object will maintain its state of motion or constant velocity.
What is Newton's second law? When the net force acting on an object is not zero, the object will accelerate in the direction of the net force. Fnet = ma
What is mass? How much matter is in an object. Same everywhere in the universe. Symbol m.
What are the SI units for mass? Kilograms
What is weight? The force of gravity acting on an object. Differs from place to place in the universe. Symbol Fg.
What are the SI units for weight? Newtons
How can weight be calculated? Fg = mg
What is Newton's third law? For every force, there is a reaction force equal in magnitude but opposite in direction.
What is "mu"? The coefficient of friction. Unitless quantity.
Created by: mskimteacher

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