Transcript Circular Motion

Circular Motion
Day 2
Curriculum
 Big Idea: The rotational motion of objects is described in
terms of angular position, angular velocity, and angular
acceleration.
 Concept: A rotating reference frame can give the appearance of
an object constrained to travel in a circular path which gives a
centripetal acceleration directed from the object toward the center
of the rotating reference frame.
PA Standard: 3.2.12.B1: Analyze the principles of rotational
motion to solve problems relating to angular momentum and
torque.
The concept of circular motion will help you to meet this standard in
later Physics courses.
Today’s Agenda
 Opener: What is the force that keeps an object moving
in a curved path or a circle?
 Academic – Define Circular Motion Physics Words
 Academic – Turn in Circular Motion Packets.
 Honors - Go over the homework in small groups:
Circular Motion Reflection Questions
 Honors - Centripetal Force Problem – #31 on page 135
 Egg Drop!
 Academic – Closure Question
Take Home Assignment:
Pages 133-135 #8-12, 19, 25, 26
Physics Vocabulary
 centripetal force: a center-directed force
that causes an object to move in a
curved (sometimes circular) path.
 centrifugal force: an apparent outward
force on a rotating or revolving body. It is
fictitious in the sense that it is not part of
an interaction but is due to the tendency
of a moving body to move in a straightline path.
Closure Question: Identical objects are on a rotating platform as
shown at the left. Answer the following question assuming that
the objects do not slip.
1. Which object has the
least acceleration?
2. Which object has the
least force acting on
it?