A. Nomenclature
1. Speed – magnitude of an objects rate of motion (no direction, scalar quantity) 2. Velocity – speed and direction of an objects motion (vector, mag & direction) 3. If a car’s speed is constant but direction is changing, velocity is changing. 4. 2 ways to change velocity (change speed or change direction). 5. acceleration – change in speed over time (vector quantity) TWO types; a. Linear acceleration – speed up or slow down

b. Centripetal acceleration – change direction

B. Centripetal acceleration (ac) – acceleration changes due to change in direction.
1. Centripetal means center seeking
2. ac is always directed toward the center of the curved path (circle) 3. If an object is moving in a circle it will always have a centripetal acceleration 4. ac = v2/rv=velocity tangent to the circle (m/s)r = radius of the circle (m)

C. Centripetal Force – the force that causes and maintains circular motion 1. Centripetal Force – Fc – psuedo-force (various forces act as center seeking force) 2. Fc – direction always toward the center.

3. Fc=mac (sub ac = v2/r)
4. Identify Fc
a. Rope over your head
b. Car rounds a corner
c. Earth – Moon
d. Gravitron machine (Fn)
e. Loop de loop (Fn Fg)
f. Swing set ride (Ftx)

D. Practice Problems in workbook p 57then regents practice 8 questions Additional Problems

7) A 13,500 N car traveling at 50.0 km/h rounds a curve of radius 2.00 x 10 2 m. find the following.
a) the ac
b) the fc
c) the minimum coefficient of static friction µ

a) 0.96 m/s2b)1322 Nc) µ=0.09

8) In the gravitron machine a cylinder with a diameter of 6 meters is set in rotation with a tangential velocity of 15 m/s. When the floor drops away, riders are suspended against the wall in a vertical position. Calculate the minimum...

...Exploration Guide: Uniform CircularMotion
Go to www.explorelearning.com and login. Please type or write your answers on a separate sheet of paper, not squished in the spaces on these pages. When relevant, data collected should be presented in a table.
Objective: To explore the acceleration and force of an object that travels a circular path at constant speed. Motion of this kind is called uniform circular...

...CircularMotion and Gravitation
Circularmotion is everywhere, from atoms to galaxies, from flagella to Ferris wheels. Two terms are frequently used to describe such motion. In general, we say that an object rotates when the axis of rotation lies within the body, and that it revolves when the axis is outside it. Thus, the Earth rotates on its axis and revolves about the Sun.
When a body rotates on its axis, all the...

...Uniform CircularMotion – a constant motion along a circle; the unfirom motion of a body along a circle
Frequency (f) – the number of cycles or revolutions completed by the same object in a given time; may be expressed as per second, per minute, per hour, per year, etc.; standard unit is revolutions per second (rev/s)
Period (T) – the time it takes for an object to make one complete revolution; may be expressed in seconds, minutes,...

...
Daily Use of Physics
Jason L. McDuffy
University of Memphis
Physics 1 (online)
Project 1
Daily Use of PhysicsPhysics is considered to be a powerful lens that helps people view the everyday world. Physics is reflected in the everyday phenomena, puzzles and toys that offer a variety of interesting challenges leading to deep and interesting problems that derive from science and...

...The Physics of Carousel
A Research Paper
Presented to
International program-physics
Global Prestasi School
In partial fullfilment
of the Requirements for the IGCSE-Physics
preparatory class
by
Nandira Kirana Thaib
January 2013
TABLE OF CONTENTS
Page
What is a carousel?....................................................................................................... 2
History…………………………………………………………………………………………. 3
The...

...INVESTIGATING CIRCULARMOTION 11/3/04
AIM
To examine some of the factors affecting the motion of an object undergoing uniform circularmotion, and then to determine the quantitative relationship between the variables of force, velocity and radius.
APPARATUS
Rubber bung Metre rule 50 gram slot masses
Glass tube 50-gram mass carrier 50-gram slot masses Metre rule
Stopwatch Sticky tape Metre rule String
THEORY
As in...

...Physics 1 – Mechanics and Heat
Lecture Notes
Prepared by:
ENGR. HAROLD JAN R. TERANO, ECE
Lesson 5
ROTATIONAL KINEMATICS AND DYNAMICS
Uniform CircularMotion – an object moves at a constant speed along a circular path.
Velocity is always tangent to the path in circularmotion. Speed is constant, velocity is not.
Centripetal Acceleration, – acceleration that maintains the...

...7
Holt Physics Chapter 7: Rotational Motion and the Law of Gravity
I. Section 7-1: Measuring Rotational Motion
A. When something spins it undergoes “rotational motion”. When something spins around a single point it is called “circularmotion”.
B. We measure how fast something spins not in m/s (different points on the object are spinning at different velocities) but by measuring...