# Shared Flashcard Set

## Details

Work
Work
8
Physics
11/06/2008

Term
 Work (pulling a box) (2)
Definition
 W = Fd cosθ area under F vs. d graph
Term
 Kinetic Energy (3)
Definition
 KE = ½ mv2 ∆KE = ½ mv22- ½ mv12 = ½ m (v22 – v12) ∆KE = Wnet
Term
 Potential Energy (vertical) (2) Potential Energy (elastic)
Definition
 PE = Wagainst grav = mgΔy Elastic PE = ½ kx2
Term
 Spring Force
Definition
 Spring Force Fspr = -kx (k = spring constant, x = horizontal distance)
Term
 Mechanical Energy (2)
Definition
 E = KE + PEEMech = ½ mv2 + mgy
Term
 Power (4)
Definition
 rate work is donework/time or energy/timeFd/time = Fv ∆KE/time
Term
 Work done by tension of string on ball spun in a circle?
Definition
 Zero because the force is perpendicular to the direction of motion, W = Fdcosθ, cos90 = 0
Term
 2 blocks (m1>m2) slide on a frictionless surface and then hit a rough spot that slows them to a stop. Which one goes farther?
Definition
 Same ΔKE so same work done to them by friction, Ffr is less for m2 so stopping distance is greater.
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