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14 Cards in this Set
- Front
- Back
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vector sum of all forces acting on an object
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vector sum
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object acted on by zero net force moves in a straight line with constant speed, or if at rest, remains at rest
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Newtons First Law
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no force is required to keep an object in motion if there are no
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forces opposing its motion
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resistance to changes in velocity, NOT resistance in the continuation of motion
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inertia
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simplified sketch of a single object with force vectors drawn to represent every force acting on it
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free-body diagrams
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2 objects exert gravitational forces on each other that are proportional to the masses of the 2 objects and inversely proportional to the square of the distance between the centers
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Newton's Second Law
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Newtons 2nd Law =
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F = Gm1m2/r2 where as g=6.674x10-11
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2 types of contact forces
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normal and friction
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contact force is perpendicular to contact surface that prevents 2 objects from passing thru one another
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normal force
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normal force is exerted on the table by book, the normal force is downward and equal in magnitude
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Newtons 3rd Law
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contact force is parallel to contact force
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friction
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2 types of friction
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static and kiinetic
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no slipping/sliding
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static friction
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slipping/sliding
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kinetic
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