Download Review: Work, Power, Circular Motion

Review: Work, Power, Circular Motion
1.
2.
Define Energy.
What are the three forms of mechanical energy storage?
Define Work.
What is the math model for Work?
On a diagram, how can you identify the angle phi?
What are the units of work?
3.
What is the difference between a conservative force
and a non-conservative force? Give examples of both.
4.
Define Power!
What is the math model that relates "Work" and "Power"?
What are the units of Power?
5.
What is the difference between Uniform Circular Motion and
Non-Uniform circular Motion?
6.
What is the definition of Period? The symbol? The units?
7.
What is the symbol for angular speed
(also called turning speed)? the units?
8.
9.
Circular Motion: How can "period" be used
to determine angular speed—in rev/s?
angular speed—in rev/min?
Define centripetal acceleration.
What is the math model for centripetal accel?
11.
Define Centripetal Force.
12.
What do you know about the sum of forces
on an object moving in a circle?
Work, Power:
class examples—lifting books, Hulky,
person climbing stairs.
Text, prob. 6-47, 6-73
Circular Motion:
class examples—hands on a clock,
circular indoor track, lifeguards whistle in
HOR circle.
WS 2D Motion, prob. 16, 17, 18
WS 2D Motion, prob. 20, 21
--------*How do Forces affect circular motion?*
Tarzan Lab, define Centripetal Force
Apply to Vertical Circles:
WS 1 [yellow]—links motion maps to
accel to motion to forces. Focus on
vertical circles.
Text, prob. 5-37
Text, prob. 5-46, 5-49
Apply to Horizontal Circles:
class example: "The Rotor"
example: Airplane hanging from ceiling
Combinations:
Circular Motion and Energy
class example, marble Roller Coaster,
"Looping the Loop"—combinations of
Energy and Circular Motion.
Text, prob. 6-40, 6-42
Practice:
A car drives in a circle of radius 27.0 meters at a speed of 11 m/s.
13.
Show how "dimensional analysis" [fancy form of one]
can be used to calculate the car's angular speed--in revolutions per minute.
14.
Refer to the previous question: What is the period of this motion?
15.
How is it possible for an object to have constant speed but still be accelerating?
16.
Later, the car drives in the same size circle--but this time at greater speed.
The car's centripetal accel is 5.5 m/s2. Calculate the car's speed.
----A box sits on an inclined plane of 25.0o. A person pushes the box uphill, parallel to the hill, with a force of
1200 Newtons, moving the box 9.0 meters along the hill in a time of forty seconds.
17.
How much grav force acts on the box?
(How does this compare to the amount of the Force of person on box?)
18.
How much work is done by the person's force on the box?
19.
What is the power output of the person? Give your answer in both Watts and Horsepower.
----When a 1200kg car drives through the bottom of a vertical circle, radius 7.50 meters, it experiences a
Normal Force (ground on car) of 21168N.
20.
What is the amount of Grav Force on the car?
21.
What is the speed of the car as it moves through the bottom of the circle?