Energy, e (Units of joules (J))

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Presentation transcript:

Energy, e (Units of joules (J)) We are going to talk about two kinds of energy: Kinetic Energy Potential Energy

Kinetic Energy, ke (Units of joules (J)) The energy of motion!

Kinetic Energy, ke (Units of joules (J)) Which would hurt more? Getting hit by a 2ft wave or a 15ft wave (moving at the same speed).

Kinetic Energy, ke (Units of joules (J)) Which snail do you think has more kinetic energy?

Kinetic Energy, ke (Units of joules (J)) KE = ½mv2 Mass (in kg) Velocity (in m/s)

Work & Kinetic Energy (Units of joules (J)) Wnet= ΔKE Change in Kinetic Energy (in J)

KE Example A constant 15,000 N force accelerates a 1700kg Maserati from rest. What is the kinetic energy of the car after traveling 50 m? G: F = 15000N d = 50m m = 1700kg vi = 0 m/s U: KE = ? vf = ? a = ? E: F = m*a a = 8.82 m/s2 a = (vf2 – vi2) / (2Δd) vf = 29.70 m/s KE = ½ mv2 S: KE = 749776.5 J

Complete #1 on the GP with your partner! Kinetic Energy Guided Practice! Complete #1 on the GP with your partner!

KE Example A worker does 1000 J of work on a 100 kg box. If the box loses 505 J of heat to the floor through the friction between the box and the floor, what is the velocity of the box after the work has been done on it? G: Wnet= 1000-505J m = 100kg vi = 0 m/s U : Wnet= ΔKE E: Wnet = ½ mvf2 - ½ mvi2 S: vf = 3.15 m/s

Complete #2 on the GP with your partner! Kinetic Energy Guided Practice! Complete #2 on the GP with your partner!