Work & Energy
1) I can determine the amount of work done by a force in a closed system. (5.1)
a. I can define work done on an object. (5.1)
i. I can differentiate between positive and negative amounts of work. (5.1)
b. I can identify the SI unit of work = Joule (J). (5.1)
i. I can describe the Joule in terms of its constituent parts (1 J = 1 N m). (5.1)
c. I can utilize the equation for work (W = Fdcosθ) to calculate the amount of work done. (5.1)
i. Force perpendicular to motion of object.
ii. Force parallel to motion of object.
iii. Force at an angle.
d. I can differentiate between positive and negative work. (5.1)
2) I can use kinetic and potential energy to describe the conservation of mechanical energy. (5.2)
a. I can identify the SI unit of energy = Joule (J). (5.2)
i. I can describe the Joule in terms of its constituent parts (1 J = 1 kg m2/s2).
b. I can define kinetic energy. (5.2)
i. I can calculate kinetic energy given mass and velocity of an object (KE = ½ mv2).
c. I can define potential energy. (5.2)
i. I can calculate gravitational potential energy given the mass and height of an object. (PEg = mgh)
ii. I can calculate elastic potential energy given the spring constant and the distance the spring is stretched. (PEelas = ½ kx2)
d. I can explain and apply the conservation of mechanical energy. (5.3)
i. I can convert between kinetic and potential energy using the law of conservation of energy. (5.3)
1. Explain the loss of energy if system is not closed.
a. Friction
b. Thermal
c. Sound
ii. I can apply the Law of Conservation of Energy to pendulums. (5.3)
1. Explain the loss of energy due to damping by friction if system is not closed.
iii. I can apply the Law of Conservation of Energy to springs. (5.2)
1. Explain the loss of energy due to damping by internal friction if system is not closed.
e. I can explain and apply the Work-Energy Theorem. (5.2)
i. I can convert between kinetic energy and work using the Work-Energy Theorem. (5.2)
ii. I can compare the units of work and energy (Joule). (5.2)
3) I can describe the rate of energy in terms of mechanical power. (5.4)
a. I can identify the SI unit of power = Watt (W). (5.4)
i. I can describe the Watt in terms of its constituent parts (1 W = 1 J/s). (5.4)
b. I can calculate mechanical power given the work done and time (P = W/t). (5.4)
c. I can calculate mechanical power given the force applied and velocity of the object (P = Fv). (5.4)