Chapter 7 Energy.

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Presentation transcript:

Chapter 7 Energy

Work = Force|| x Distance In this case, the distance is the magnitude of the displacement. Only the component of force parallel or antiparallel to the displacement does work

M= 10kg In this case, the weight does positive work d = 2 m Work = Mgd = (100N)(2m) Work = 200 Nm =200J M= 10kg Mg = 100N

Fa Fa M= 10kg In this case, the weight does negative work Mg = 100N d = 2 m Fa Work = -Mgd = -(100N)(2m) Work = -200 Nm = -200J M= 10kg Mg = 100N

Potential Energy An object’s ability to do work by virtue of its position.

How much work does gravity do on the falling mass? PE = mgh mg h h Work = mgh mg

How much energy does the mass have at the bottom just before it hits the ground? PE = mgh mg h h Work = mgh mg v

How much energy does the mass have at the bottom just before it hits the ground? This is the kinetic energy PE = mgh mg h KE = ½ mv2 Work = mgh mg v

Energy is conserved

PE = 1000J KE = 0J PE = 800J KE = 200J PE = 400J KE = 600J PE = 0J KE = 1000J

PE = 500J KE = 0J PE = 100J PE = 100J KE = 400J PE = 0J KE = 400J KE = 500J

Machines N M D F d Mg Fulcrum Work = FD = Nd

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