Download 2011 Review Chapter 7 and 8

Review Chapter 7,8,9 AP Test #5
Chapter 7
Homework Problems: <5,11,13,34,45,47,54,57,66>
Notes : (Chapter 7 all)
 What is kinetic energy? What is it proportional to? (1,2,3)<5>
 Know how to find work done by a constant force. (4-12,15-19)<54,57>
 Be able to find the work done by a gravitational force (10-12,17,18,19)<54,57>
 Be able to find the work done by a spring force or any variable force. Know that the area
under the force displacement curve is work (20-31) <34,54,66>
 Know how to find positive, negative or zero work done by a constant force.
(12,13)<11,13>
 Be able to find the net work done on an object.(13,14,16)<11,13,54>
 Be able to use an antiderivative to find work done by a force on a body that undergoes a
displacement in one dimension (25-31, 1975, 2009)<34,66>
 Be able to use a dot product to find work.(5)<11,13,54,57>
 Use the work-energy theorem to 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 (13,15,16)<13,54>
 Calculate power to maintain the motion of an object with constant acceleration. (32-33)
 Calculate the work performed by a force that supplies constant power or the average
power supplied by a force that performs a given amount of work (32-40)
Chapter 8
Homework: <Q2,Q4,4,8,25,31,32,43,47,50,53,56,58,59,63,121>
Notes(all)
 Know how gravitational potential energy relates to work and change in kinetic energy (13)
 Know how potential energy is related to the gravitational force or a variable force (414)<4,8,32>
 Be able to read a potential energy curve (stable/unstable equilibrium, slope, kinetic
energy, velocity). (25-31)<Q2,Q4,121>
 Know how potential energy and work is related to the gravitational force or a variable
force (6-10)<4,8,32,59>
 Know when and how to use conservation of mechanical energy and when to use it with
potential energy curves ( 11-17,19,20,21,22,23,24,25,26)
 Conservation of energy including friction (32-end)<43,47,50,53,56,58,59,63>
 Explain why potential energy can be associated only with conservative forces
 Understand force displacement and work displacement graphs (13-14)
 Be able to take a derivative of a potential energy function, and antiderivative of a force
position vs time function. (6,11)
 Know when and how to use conservation of mechanical energy. (16-24) <Q4,25,31,121>
 Define “conservative force” and describe examples of conservative forces and nonconservative forces (15)

Use Elastic potential energy appropriately when solving using conservation of
mechanical energy (12-14,20-26)
Be able to recognize and solve problems that call for application both of conservation of
energy and Newton’s Laws (this includes conservative and nonconservative forces).
(19,23)
Apply conservation of energy to systems of objects (Atwood’s machine), springs, and
non constant one dimensional force. (opening activity) <31,59>
Know when to use Hooke’s law to find the spring constant of a spring versus when to use
conservation of energy to Calculate the amplitude or lowest point of compression.(23)



K  1/ 2mv 2
W  F d  K
,
if F is constant
xf
W=  F dx  K
Note: F must be in direction of motion
x1
F  kx
Work done by a spring W=1/2 kx2
Power=Work/time
Powerinstant=dW/dt= F v or F(cos )v where both F and v are the instantaneous values
Potential energy: Gravitational U=mgh
Chapter 9
Homework <Q2,2,3,4,88>
Notes(1-20)
 Be able to calculate center of mass for a uniform density solid or a group of masses (1320) <Q2,2,3,4,88>
 Be able to solve boat problems (18-20)