Physics Final Index Card Page 2

# Physics Final Index Card Page 2 - elevator coming to a stop...

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Newton’s First Law –in the absence of external forces, when viewed from an inertial reference frame, an object at rest remains at rest and an object in motion continues in motion with a constant velocity. The force required to maintain a body at constant velocity in free space is 0. Newton’s Second Law – the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass Σ F=ma Newton’s Third Law – if two objects interact, the force exerted by object on object 2 is equal in magnitude but opposite in direction to the force exerted by object 2 on object 1 “forces only exist in equal and opposites” Mass Metric Kilogram English Slug: Weight Metric Newton English Pound; w=mg 1kgx9.8m/s 2 =9.8N; an example of velocity and acceleration opposite is an “up”
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Unformatted text preview: elevator coming to a stop at the top floor; an example of a speed constant but velocity changing is a car driving in a circle; tablecloth demo – Newton’s first law; a projectile fire at an angle, velocity at top of trajectory? Vox=v cos θ Voy = 0 at top of trajectory; acceleration at top of trajectory: gravity. 1D Perfectly Inelastic Collision: m 1 v 1i + m 2 v 2i = (m 1 +m 2 ) v f 1D Elastic Collision: m 1 v 1i + m 2 v 2i = m 1 v 1f + m 2 v 2f ⇒ ½ m 1 v 1i 2 + ½ m 2 v 2i 2 = ½ m 1 v 1f 2 + ½ m 2 v 2f 2 ; v 1f = v 1i (m 1-m 2 )/(m 1 +m 2 ); v 2f = v 1i (2m 1 /m 1 +m 2 ); 2D Collisions: m 1 v 1ix + m 2 v 2ix + m 1 v 1fx + m 2 v 2fx ; m 1 v 1iy + m 2 v 2iy = m 1 v 1fy + m 2 v 2fy ; if collision is elastic, 3 rd equ for consv. Energy ½ m 1 v 1i 2 = ½ m 1 v 1f 2 + ½ m 2 v 2f 2...
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