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### 12 Cards in this Set

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 newtons First Law Objects velocity doesnt change unless acted upon by a force Newtons Second Law Fnet = ma, acceleration is always in same direction as force (NOT velocity). Newtons Third Law To every action there is equal but opposite reaction. Effects of the forces are different Newtons Law of Gravitation Fgravity = G* Mm/r^2, g= G * M/r^2 Static Friction When there is no sliding (no relative motion between surfaces) Kinetic Friction When there is relative motion between surfaces (sliding) Normal Force Force that acts perpendicular to the surface Force of Kinetic Friction F =m (k) * F (n) m (k) - coefficient of kinetic friction Direction of the force is opposite to the direction of velocity (parallel to surface) Maximum Force of Static Friction Fmax = m (s)* F (n) m (s) - coefficient of static friction m(s)>m(k) Direction of force opposite to the direction of intended velocity Force due to gravity acting parallel to the inclined plane F = mg sin (incline angle) Normal force exerted by inclined plane F = mgcos (incline angle) Pulley Device that changes direction of tension that pulls on the object that string is attached to