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# Physics Ch. 4&5

### Ch. 4 and 5 study cards

Newton's First Law of Motion An object stays at rest or in motion (at a constant velocity) unless another net force changes its state. Often called the Law of Inertia
Newton's Second Law of Motion For a given net force, the magnitude of the acceleration is inversely proportional to the mass.
Newton's Third Law of Motion Often called acceleration or action-reaction law; states whenever 1 object exerts a force on a 2nd object, the 2nd object exerts a opposite directed force of = magnitude on the 1st object. For every action/force, there is a =, but opposite, reaction
Force A force is a push or pull and is a vector quality. The SI Unit of Force is Newton or kg*m/s2
Mass Mass is a property of matter that determines how difficult it is to accelerate or decelerate an object. Mass is a scalar quantity. 2)The mass of a body is a quantitative measure of inertia adn is measured in an SI unit of kg.
Weight W=mg; The weight of an object is the gravitational force that the earth exerts on the object. SI unit: Newton
Free Fall a=-g. The apparent weight is 0 b/c when both the person and the scale fall freely, they cannot push against one another.
Weightlessness the apparent weight is 0; apparent weight=mg +ma
Inertia Inertia is the natural tendency of an object to remain at rest or in motion at a constant velocity. The SI unit of Inertia and Mass is kg.
Kinetic Friction Kinetic Friction is usually less than Static Friction. The force of kinetic friction btw 2 surfaces sliding against one another opposs the relative motion of the surfaces.
Static Friction The force of static friction btw 2 surfaces opposes any impending relative motion of the surfaces.
1 Newton (N) =1 kg*m/s2
1 dyne (dyn) = 1 g*cm/s2
1 slug (sl) =1 lb*s2/ft
1 pound (lb) =1 ft/s2
Three fundamental forces gravitational force, strong nuclear force, and electroweak force
Normal Force The normal force is one component of the force that a surface exerts on an onject w/ which it is in contact--nameley, the component that is perpendicular to the surface.
Friction The force component parallel to the surface is called friction.
Kepler's third law The period is proportional to the 3/2 power of the orbital radius.

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