WARM UP 1)How much potential energy does a 20 kg child have when she is 4 m up in a tree? 2) When would you observe elastic potential energy? 3) A spring.

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Presentation transcript:

WARM UP 1)How much potential energy does a 20 kg child have when she is 4 m up in a tree? 2) When would you observe elastic potential energy? 3) A spring with a spring constant of k = 2 kg/s2 is compressed 4 m. how much energy is stored in the spring?

LEARNING GOALS Define work Calculate the amount of work done by a constant force Define and calculate Power

Work Work is a process which changes the amount of energy in a system There are two ways to find the amount of work done 1) Work = change in energy W = ΔE 2) Work = force x distance W = Fd

Examples REMEMBER: work is measured in Joules Change in energy The amount of energy in a system increases by 12 J, how much work was done on the system? Work done by a constant force A 15 N force pushes a stubborn pony 4 m. How much work did the force do?

Together Change in energy How much work must be done on a system to increase its energy by 4000 J? Work done by a constant force A 30 N force pushes an armadillo 2 m. How much work did the force do?

Practice Change in energy The amount of energy in a system increases by 62.78 J, how much work was done on the system? Work done by a constant force A 3 N force pushes Mr. Baden 12 m. How much work did the force do?

WORKSHEET

Roller Coaster Cutting

Power Power = work divided by time P = W / t The unit for power is the Watt (W)

Practice 40 J of work are done on a box of chocolates in 10 s. How much power was used to do this?

COOL DOWN 1) How much work does it take to increase the amount of energy in a car by 3000 J? 2) 10 N of force are applied over a distance of 9 m. How much work was done by the force?