UNIFORM CIRCULAR MOTION...following uniform circular motion. This is the tendency of your body to...

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12 PHYSICS BURNS 2016 U2: L4 UNIFORM CIRCULAR MOTION UNIFORM CIRCULAR MOTION is motion in a circle at a constant speed. CENTIRPETAL ACCELERATION is the acceleration of an object moving in constant circular motion. BUT WAIT! If the object is moving at a CONSTANT VELOCITY, is there acceleration???? Acceleration is defined as the change in velocity (a VECTOR…magnitude AND direction) over the change in time. If the velocity vector experiences a change in DIRECTION while staying at a constant magnitude, there is a DIRECTIONAL component of acceleration!

Transcript of UNIFORM CIRCULAR MOTION...following uniform circular motion. This is the tendency of your body to...

Page 1: UNIFORM CIRCULAR MOTION...following uniform circular motion. This is the tendency of your body to resist change in velocity. When you drive around a curved corner, you are likely to

12 PHYSICS BURNS 2016

U2: L4

UNIFORM CIRCULAR MOTION

UNIFORM CIRCULAR MOTION is motion in a circle at a constant speed.

CENTIRPETAL ACCELERATION is the acceleration of an object moving in constant circular

motion.

BUT WAIT! If the object is moving at a CONSTANT

VELOCITY, is there acceleration????

Acceleration is defined as the change in velocity (a VECTOR…magnitude

AND direction) over the change in time. If the velocity vector experiences a

change in DIRECTION while staying at a constant magnitude, there is a

DIRECTIONAL component of acceleration!

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CENTRIPETAL: “center seeking”

CENTRIPETAL FORCE is not a new force, it is simply a way of describing

forces which act towards the center of a circular motion.

AVERAGE SPEED & CENTRIPETAL MOTION

R = RADIUS

T = PERIOD (time to make one cycle of the circle)

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This means that…

Does rotational velocity depend on where the little ladybug is on the record?

Does tangential velocity depend on where the little ladybug is on the record?

COMPARE THE VELOCITIES!

A = 2πr1 / T

B = 2πr2 / T

C = 2πr3 / T

A particle travels from point A to B in 4 seconds find

the tangential velocity of that particle.

T/2 = 4s … so … T=8 s

v = 2π(3m) / 8s

v=2.36 m/s

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Page 5: UNIFORM CIRCULAR MOTION...following uniform circular motion. This is the tendency of your body to resist change in velocity. When you drive around a curved corner, you are likely to

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U2: L4

CENTRIFUGAL EFFECT is the feeling of inertia you feel when

following uniform circular motion. This is the tendency of your body to resist

change in velocity. When you drive around a curved corner, you are likely

to feel your body lean outwards (away from the curve). This is not

technically a FORCE, rather the feeling of inertia. Centrifugal effect is not

drawn on Free Body Diagrams.

CENTRIFUGAL: “tending to move away from center”

Knowing that centrifugal effect is related to inertia is important in understanding what

would happen to an object if its constant circular motion were interrupted. What

direction would the velocity take if this object’s path were interrupted???

Name three different parts of a car which can affect velocity:

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U2: L4

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U2: L4

Page 8: UNIFORM CIRCULAR MOTION...following uniform circular motion. This is the tendency of your body to resist change in velocity. When you drive around a curved corner, you are likely to

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U2: L4

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12 PHYSICS BURNS 2016

U2: L4

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Uniform Circular Motion

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09 uniform circular motion

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Chapter 5: Uniform Circular Motion Chapter Goal: To learn how to solve problems about uniform circular motion. Uniform circular motion: the motion of an.

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I. Definitions II. Projectile motion III. Uniform circular ...roldan/classes/phy2048-ch4_sp12.pdfProjectile motion III. Uniform circular motion ... Non-Uniform circular motion 2 2

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Topics of Uniform Circular Motion (UCM) · Kinematics of Uniform Circular Motion Uniform circular motion: motion in a circle of constant radius at constant speed Instantaneous velocity

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