By the end of today, IWBAT…

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Presentation transcript:

By the end of today, IWBAT… Wednesday, 11/19/14 TEKS: P 6.A- Investigate and calculate quantities using the work-energy theorem in various situations By the end of today, IWBAT… Define and calculate work and power Essential Question: What are work and power? Topic: Work and Power

What it might look like on a test…

Force acting through a distance What is work? Force acting through a distance Units = Joules (J) Look familiar?

Doin’ WORK

KEY POINT Box moving = force being applied = work being done Work is ONLY being done while the FORCE is being applied, aka the object must ACCELERATE Not moving yet = no acceleration = no force = no work No longer moving= no work

What are the effects of work? #1 – object changes position (aka moves) #2 – object changes velocity (aka accelerates)

What is the equation for work? W = Fd W = work done by the force F = force on object along its line of motion d = distance the object moves while the force is acting

Quick Checks What is work? What are the units for work? If I get really tired using a lot of force to push against a wall, am I doing work? What two things should you look for to know that work is being done? What is the equation for work? What two things does work depend on?

Practice Problem How much work is performed when a 50 kg crate is pushed 15 m with a force of 20 N?

How much time it takes to do a certain amount of work What is power? How much time it takes to do a certain amount of work Units = Watts (W)

Both the rock climber and the hiker are going to the same place, so they are doing the same amount of WORK However, it will probably take the rock climber a lot longer to get there, meaning that her POWER is much lower

What is the equation for power? Fd P = W t P = power rating of object W = work done by the object (=Fd) t = time it takes to do the work

Quick Checks What is power? What are the units for power? How is power different from work? What is the equation for power? What does power depend on? Who exerts more power: a truck exerting 50 J of work in 10 seconds or a bike exerting 50 J or work in 3 seconds?

Practice Problem A motor does 6000 J of work in 40 seconds. What is the motor’s power output?

Partner Practice Complete the 5 word problems on the back of your C-notes Use the equations you just learned Make sure your answers have units

Exit Ticket – Answer on index card 1. 2. If an object has a mass of 47 kg and is moved 27 m in 60 s, how much power was used?

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