By the end of this unit, a successful student will be able to:
1) Understand the definition of work including when it is positive, negative or zero so they can:
o Calculate the work done by a specified constant force on an object that undergoes a specified displacement. (APIC1a1)
o Relate the work done by a force to the area under a graph of force as a function of position, and calculate this work in the case where the force is a linear function of position. (AP1C1a2)
o Use the scalar product operation to calculate the work performed by a specified constant force F on an object that undergoes a displacement in a plane. (AP1C1a4)
2) Understand that a force exerted on an object can change the kinetic energy of the object where:
o The change in the kinetic energy of an object depends on the force exerted on the object and on the displacement of the object during the time interval that the force is exerted. (APPhys 3.E.1)
3) Understand and be able to apply the work-kinetic energy theorem, so they can:
o Calculate the change in kinetic energy or speed that results from performing a specified amount of work on an object. (AP1C1b1)
o Calculate the work performed by the net force, or by each of the forces that make up the net force, on an object that undergoes a specified change in speed or kinetic energy. (AP1C1b2)
o Apply the theorem to determine the change in an object’s kinetic energy and speed that results from the application of specified forces, or to determine the force that is required in order to bring an object to rest in a specified distance. (AP1C1b3)
4) Understand the concept of potential energy so they can:
o Write an expression for the force exerted by an ideal spring and for the potential energy of a stretched or compressed spring. (AP1C2b4)
o Calculate the potential energy of one or more objects in a uniform gravitational field (AP1C2b5)
5) Describe the relationships among energy, work, and power both conceptually and quantitatively, (MCAS 2.4) and use those relationships to solve problems.
6) Understand that interactions with other objects or systems can change the total energy of a system:
o The energy of a system includes its kinetic energy, potential energy, and microscopic internal energy. Examples should include gravitational potential energy, elastic potential energy, and kinetic energy. (APPhys 4.C.1)
o Mechanical energy (the sum of kinetic and potential energy) is transferred into or out of a system when an external force is exerted on a systeme such that a component of the force is parallel to its displacement. The process through which the energy is transferred is called work. (APPhys 4.C.2)
7) Understand the concepts of mechanical energy and of total energy, so they can:
o Describe and identify situations in which mechanical energy is converted to other forms of energy (AP1C3a2)
o Analyze situations in which an object’s mechanical energy is changed by friction or by a specified externally applied force. (AP1C3a3)
8) Interpret and provide examples that illustrate the law of conservation of energy (MCAS 2.1)
9) Interpret work and the law of conservation of energy in terms of open and closed systems
10) Provide examples of how energy can be transformed from kinetic to gravitational potential energy and vice versa. (MCAS 2.2)
11) Provide examples of how other forms of energy can be transformed from one to another or from one object to another.
12) Understand that certain quantities are conserved, in the sense that the changes of those quantities in a given system are always equal to the transfer of that quantity to or from the system by all possible interactions with other sytems:
o A system is an object or a collection of objects. The objects are treated as having no internal structure (APPhys 5.A.1)
o For all
13) Understand conservation of energy so they can:
o Identify situations in which mechanical energy is or is not conserved. (APIC3b1)
14) Apply quantitatively the law of conservation of mechanical energy to a variety of systems. (MCAS 2.3)
o Including connected objects, such as an Atwood’s machine (APIC3b2)
o Including objects that move under the influence of springs (APIC3b3)
15) Understand the definition of power so they can:
o Calculate the power required to maintain the motion of an object with constant acceleration (e.g., to move an object along a level surface, to raise an object at a constant rate, or to overcome friction for an object that is moving at a constant speed). (APIC4a)
o Calculate the work performed by a force that supplies constant power, or the average power supplied by a force that performs a specified amount of work. (APIC4b)
16) Identify appropriate standard international units of measurement for energy, work, and power. (MCAS 2.6)
All assignments are due on the date listed. That is not the date they are assigned.
Due date Day Assignment
Note: Assignments are more spread out this unit with the expectation
that you are working on your project alongside the regular assignments
? Day 1 Read: Chapter 6 (Goals 1, 5, 15, 16)
Do: Questions: 1-8 (PS 19)
? Day 3 Do: Ch 6: 1, 5, 8, 12, 21, 23, 24, 26, 29, 30, 59, 67 (PS 20)
(Goals 1, 5, 15, 16)
? Day 4 Do: Ch 6: Questions 9 – 24 (PS 21)
(Goals 1 – 16)
? Day 6 Hooke’s Law Lab (Goals 1 – 16)
? Day 9 Do: Ch 6: 34, 43, 48, 52, 54, 72, 77, 81, 88, 91, 92 (PS 22)
(Goals 1 – 16)
? Day 10 Write: Roller Coaster Lab (Goals 1 – 16)
Project Choice
? Day 11 Do: Car Problems – handout (Goals 1 – 16)
? Day 12 Test: Chapter 6