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Chapter 5 Chapter 5 Section 4 Objective- Wait to copy this until next time we meet. • We will learn about: – – – – Power Work Energy and The conservation of energy Warm-Up • No Warm Up 1 Power- the rate @ wh. Work si done or energy is transformed Since W = F x d then… And D/T = Velocity SO….. 3 P=Fv 2 Example • A 193kg curtain needs to be raised 7.5m, at constant speed, in as close to 5.0sec as possible. The power ratings of three motors are listed as 1.0kW, 3.5kW, and 5.5kW. Which motor is best for the job? Exit Ticket • HW: Pg 181 1,3,4 • Hint: #1 Force is going to be ( mg + Fk) • Hint: #3 Work= mgd Chapter 5 Section 1 and 2 Objective Warm-Up • We will learn about: • Get out HW, we will check it – – – – Power Work Energy and The conservation of energy Work- is done on an obj. when a Force causes a displacement Units: Work (Joules or J) Force (N) Displacement ( m) This formula is when work is parallel to displacement I don’t really like to s W= F d Cos theta Sign of Work Displacement will determine sign of work + work done ON obj (force is in direction of motion) - Work done BY obj (force is opposite to motion) Sample problem Pg 161 Energy Kinetic Energy (KE) *Obj in motion *Speed and mass matter *W net= KE Potential Energy * Energy due to obj’s height, position from zero level Relaxed x compressed m=mass in kg V=velocity Sample problem B, C, D M=mass in kg H=height K=spring constant X=distance compressed or stretched Exit Ticket • HW: Pg 162 #3 AND 163 #1 and #3 Lab Day Objective Warm-Up • We will learn about: • Get out HW, we will check it – – – – Power Work Energy and The conservation of energy Exit Ticket HW: • PG: 166 #3 • PG 168 # 1 • PG 172 #1 and 3a only Chapter 5 Section 2 and 3 Objective Warm-Up • We will learn about: • Get out HW, we will check it – – – – Power Work Energy and The conservation of energy • Finish section 2 if needed Conservation of Energy • Conservation of energy is the same as constant: The law of conservation of energy (energy cannot be created nor destroyed) is the same as the law of constant energy • Mechanical energy is not the same as nonmechanical energy( wh is nuclear, chemical, electrical) PE can also come from both a spring and gravity in which case it would be the SUM of PE ME initial = ME final ideally ALL PE turns into KE BUT the reality is because we always have friction this does not happen. Energy is not LOST it is just converted. Remember energy cannot be created nor destroyed Sample Problem E Exit Ticket HW: • PG: 177 #1 and #2 • PG 178 # 1 Review Day Objective • Review for test Warm-Up • Get out HW, we will check it