Unit III:Circular Motion,
Work, & Energy
6.3 Mechanical Energy in Isolated
and
Non-isolated Systems
6.3 Mechanical Energy in Isolated and Nonisolated Systems
Law of Conservation of Energy: Within an isolated system,
energy may be transferred from one obje
Physics 20 End of Year Review
Chapter 1: Graphs and equations describe motion in one dimension
Key Terms and Concepts
kinematics
origin
position
scalar quantity
vector quantity
distance
displacement
velocity
uniform motion
at rest
acceleration
non-uniform
6.4 Work and Power
6.4: Work and Power
Toward the end of the 18th century, horses were the main
source of energy used to drive the pumps that removed water
from mines.
(1736-1819) James Watt used the unit of horsepower (hp) to
compare the effectiveness
Energy & Work: Variables, Equations, and Relationships
Work: a scalar measure of the amount of energy transferred when a force acts over a given displacement.
Only the component of the force parallel to the displacement actually does work.
There must be m
Name: _ Class: _
Physics 20 Work and Energy Assignment
1. A 12.0 m long frictionless metal plank is placed at an angle of 20.0 to the horizontal. A puck is
placed at the high end and let go so it slides down the metal. Find the speed of the puck at the
bo
PHYSICS 20: Course Outline /
Expectations
Teacher: Mr. D. Makar
Voice mail 403-289-9241 #7181 E-mail: [email protected]
The course consists of four units of study:
Uni
t
Chapter
s
Topic
Kinematics: scalar and vector quantities, uniform motion, uniformly a
Sci10: Kinematics, Work, & Energy Equations
Average Speed
d
v = d / t
t = v t
t = d / v
v
t
v is average speed in(m/s)
Where: d is Change in Distance in meters (m)
(distancefinal distanceinitial )
t is Change in Time in seconds (s)
(timefinal timeinitial
Name: _ Class: _
Physics 20: Work and Energy Exercise
1. A sled is pulled a distance of 50.0 m along the snow with a rope that makes a 40.0 angle with the snow. The rope
has a tension of 125.0 N.
(a) How much is work is done on the sled by the tension for