CIRCULAR MOTION Flashcards
➔ Refers to the motion of a body turning about an axis, where each particle of the body moves a circular path.
Rotation
Rotation is aka
uniform circular motion
E.g. roller coasters, movement of celestial bodies in accordance with the sun, a car rotating around a rotonda
uniform circular motion / rotation
When an object is moving in ______ the object that is turning is able to complete a revolution, this revolution is actually the circumference of the circle that is created.
a uniform circular motion,
To measure a circle, you must consider: (2)
★ The circumference of the circle
★ The radius of the circle
These quantities are expressed in the context of the rotational motion
TRANSLATIONAL AND ROTATIONAL MOTION
➔ The ratio of the distance traveled along the circumference to the circle’s radius.
ANGULAR DISPLACEMENT
Physicists use _______ to describe circular motion
angular quantities
The direction of ______ is always changing, but its magnitude may or may not be constant
tangential velocity
_________ are used to represent the angular quantities
Greek letters
➔ The velocity v of a body moving in a circular path with radius of curvature r at any instant is directed tangentially.
TANGENTIAL VELOCITY
➔ A straight line that passes through a point on the sides of the circle or on the circle
Tangent
The point where the tangent line and the circle meet is called the _____
point of tangency.
➔ Responsible for the changes in the linear speed of a given body
TANGENTIAL ACCELERATION
➔ Accounts for changes in the direction of the velocity
This accounts for the changes in the velocity towards the center of the circle
RADIAL/CENTRIPETAL ACCELERATION
➔ The object is attracted to the center
centripetal;
➔ Acceleration with respect to the tangent.
TANGENTIAL ACCELERATION
➔ Is the force applied away from the center of a circular motion
Centrifugal Force
➔ The force applied toward the center of a circular motion
Centripetal force
➔ Land speed is always relative to the surface of the earth.
➔ Whenever we examine an object’s velocity, it is good to remember that it’s all relative
relative motion
➔ Physics is concerned with the motion of objects and the quantitative analysis of that motion
➔ Everything is in constant motion.
RELATIVE MOTION
true or false
The earth is an inertial reference frame
true
➔ The object that we pretend is still as we assess the motion of other objects relative to this________
Inertial Reference Frame
Our planet is a good inertial reference frame, one that is used frequently throughout the study of physics.
t or f
true
was the first to describe relative motion
Galileo Galilei
